946 lines
23 KiB
C
946 lines
23 KiB
C
/*
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* kernel/power/main.c - PM subsystem core functionality.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/export.h>
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/pm-trace.h>
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#include <linux/workqueue.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/random.h>
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#ifdef CONFIG_PM_WAKEUP_TIMES
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#include <linux/poll.h>
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#endif
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#include "power.h"
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DEFINE_MUTEX(pm_mutex);
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#ifdef CONFIG_PM_SLEEP
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/*
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* Enable/Disable suspend back off logic attribute
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*/
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static bool sbo_enabled = true;
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/*
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* For how many percent an alive time is decayed
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* if suspend back-off keeps ongoing.
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*/
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static u32 sbo_decay_value = 20;
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/*
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* Initial max back-off alive time
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*/
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static u32 sbo_initial_alive_time_msecs = 10000;
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/*
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* A time in milliseconds, before which a short
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* sleep counter is increased to trigger a back-off.
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*/
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static u32 sbo_short_sleep_msecs = 1100;
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/*
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* This variable regulates starting of suspend
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* back off functionality, after counter is reached
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* specified value.
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*/
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static u32 sbo_short_sleep_count = 10;
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static u32 decay_alive_time_ms;
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static u32 suspend_short_count;
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static struct wakeup_source *ws;
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/* Routines for PM-transition notifications */
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static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
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int register_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(register_pm_notifier);
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int unregister_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_pm_notifier);
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int __pm_notifier_call_chain(unsigned long val, int nr_to_call, int *nr_calls)
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{
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int ret;
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ret = __blocking_notifier_call_chain(&pm_chain_head, val, NULL,
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nr_to_call, nr_calls);
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return notifier_to_errno(ret);
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}
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int pm_notifier_call_chain(unsigned long val)
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{
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return __pm_notifier_call_chain(val, -1, NULL);
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}
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/* If set, devices may be suspended and resumed asynchronously. */
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int pm_async_enabled = 1;
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static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", pm_async_enabled);
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}
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static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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unsigned long val;
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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if (val > 1)
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return -EINVAL;
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pm_async_enabled = val;
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return n;
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}
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power_attr(pm_async);
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#ifdef CONFIG_PM_DEBUG
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int pm_test_level = TEST_NONE;
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static const char * const pm_tests[__TEST_AFTER_LAST] = {
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[TEST_NONE] = "none",
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[TEST_CORE] = "core",
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[TEST_CPUS] = "processors",
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[TEST_PLATFORM] = "platform",
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[TEST_DEVICES] = "devices",
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[TEST_FREEZER] = "freezer",
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};
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static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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char *s = buf;
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int level;
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for (level = TEST_FIRST; level <= TEST_MAX; level++)
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if (pm_tests[level]) {
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if (level == pm_test_level)
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s += sprintf(s, "[%s] ", pm_tests[level]);
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else
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s += sprintf(s, "%s ", pm_tests[level]);
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}
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if (s != buf)
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/* convert the last space to a newline */
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*(s-1) = '\n';
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return (s - buf);
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}
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static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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const char * const *s;
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int level;
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char *p;
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int len;
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int error = -EINVAL;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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lock_system_sleep();
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level = TEST_FIRST;
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for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
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if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
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pm_test_level = level;
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error = 0;
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break;
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}
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unlock_system_sleep();
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return error ? error : n;
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}
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power_attr(pm_test);
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#endif /* CONFIG_PM_DEBUG */
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#ifdef CONFIG_DEBUG_FS
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static char *suspend_step_name(enum suspend_stat_step step)
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{
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switch (step) {
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case SUSPEND_FREEZE:
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return "freeze";
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case SUSPEND_PREPARE:
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return "prepare";
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case SUSPEND_SUSPEND:
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return "suspend";
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case SUSPEND_SUSPEND_NOIRQ:
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return "suspend_noirq";
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case SUSPEND_RESUME_NOIRQ:
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return "resume_noirq";
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case SUSPEND_RESUME:
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return "resume";
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default:
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return "";
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}
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}
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static int suspend_stats_show(struct seq_file *s, void *unused)
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{
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int i, index, last_dev, last_errno, last_step;
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last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
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last_dev %= REC_FAILED_NUM;
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last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1;
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last_errno %= REC_FAILED_NUM;
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last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
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last_step %= REC_FAILED_NUM;
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seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
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"%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
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"success", suspend_stats.success,
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"fail", suspend_stats.fail,
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"failed_freeze", suspend_stats.failed_freeze,
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"failed_prepare", suspend_stats.failed_prepare,
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"failed_suspend", suspend_stats.failed_suspend,
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"failed_suspend_late",
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suspend_stats.failed_suspend_late,
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"failed_suspend_noirq",
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suspend_stats.failed_suspend_noirq,
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"failed_resume", suspend_stats.failed_resume,
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"failed_resume_early",
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suspend_stats.failed_resume_early,
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"failed_resume_noirq",
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suspend_stats.failed_resume_noirq);
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seq_printf(s, "failures:\n last_failed_dev:\t%-s\n",
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suspend_stats.failed_devs[last_dev]);
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for (i = 1; i < REC_FAILED_NUM; i++) {
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index = last_dev + REC_FAILED_NUM - i;
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index %= REC_FAILED_NUM;
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seq_printf(s, "\t\t\t%-s\n",
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suspend_stats.failed_devs[index]);
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}
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seq_printf(s, " last_failed_errno:\t%-d\n",
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suspend_stats.errno[last_errno]);
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for (i = 1; i < REC_FAILED_NUM; i++) {
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index = last_errno + REC_FAILED_NUM - i;
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index %= REC_FAILED_NUM;
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seq_printf(s, "\t\t\t%-d\n",
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suspend_stats.errno[index]);
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}
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seq_printf(s, " last_failed_step:\t%-s\n",
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suspend_step_name(
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suspend_stats.failed_steps[last_step]));
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for (i = 1; i < REC_FAILED_NUM; i++) {
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index = last_step + REC_FAILED_NUM - i;
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index %= REC_FAILED_NUM;
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seq_printf(s, "\t\t\t%-s\n",
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suspend_step_name(
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suspend_stats.failed_steps[index]));
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}
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#ifdef CONFIG_PM_WAKEUP_TIMES
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seq_printf(s, "%s\n%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms\n",
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"suspend time:",
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" min:", ktime_to_ms(ktime_sub(
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suspend_stats.suspend_min_time.end,
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suspend_stats.suspend_min_time.start)),
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"start:", ktime_to_ms(suspend_stats.suspend_min_time.start),
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"end:", ktime_to_ms(suspend_stats.suspend_min_time.end),
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" max:", ktime_to_ms(ktime_sub(
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suspend_stats.suspend_max_time.end,
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suspend_stats.suspend_max_time.start)),
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"start:", ktime_to_ms(suspend_stats.suspend_max_time.start),
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"end:", ktime_to_ms(suspend_stats.suspend_max_time.end),
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" last:", ktime_to_ms(ktime_sub(
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suspend_stats.suspend_last_time.end,
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suspend_stats.suspend_last_time.start)),
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"start:", ktime_to_ms(suspend_stats.suspend_last_time.start),
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"end:", ktime_to_ms(suspend_stats.suspend_last_time.end),
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" avg:", ktime_to_ms(suspend_stats.suspend_avg_time));
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seq_printf(s, "%s\n%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms (%s %lldms %s %lldms)\n" \
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"%s %lldms\n",
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"resume time:",
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" min:", ktime_to_ms(ktime_sub(
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suspend_stats.resume_min_time.end,
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suspend_stats.resume_min_time.start)),
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"start:", ktime_to_ms(suspend_stats.resume_min_time.start),
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"end:", ktime_to_ms(suspend_stats.resume_min_time.end),
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" max:", ktime_to_ms(ktime_sub(
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suspend_stats.resume_max_time.end,
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suspend_stats.resume_max_time.start)),
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"start:", ktime_to_ms(suspend_stats.resume_max_time.start),
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"end:", ktime_to_ms(suspend_stats.resume_max_time.end),
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" last:", ktime_to_ms(ktime_sub(
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suspend_stats.resume_last_time.end,
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suspend_stats.resume_last_time.start)),
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"start:", ktime_to_ms(suspend_stats.resume_last_time.start),
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"end:", ktime_to_ms(suspend_stats.resume_last_time.end),
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" avg:", ktime_to_ms(suspend_stats.resume_avg_time));
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#endif
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return 0;
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}
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static int suspend_stats_open(struct inode *inode, struct file *file)
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{
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return single_open(file, suspend_stats_show, NULL);
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}
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#ifdef CONFIG_PM_WAKEUP_TIMES
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static unsigned int suspend_stats_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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unsigned int mask = 0;
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poll_wait(filp, &suspend_stats_queue.wait_queue, wait);
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if (suspend_stats_queue.resume_done) {
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mask |= (POLLIN | POLLRDNORM);
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suspend_stats_queue.resume_done = 0;
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}
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return mask;
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}
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#endif
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static const struct file_operations suspend_stats_operations = {
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.open = suspend_stats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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#ifdef CONFIG_PM_WAKEUP_TIMES
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.poll = suspend_stats_poll,
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#endif
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.release = single_release,
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};
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static int __init pm_debugfs_init(void)
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{
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debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO,
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NULL, NULL, &suspend_stats_operations);
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#ifdef CONFIG_PM_WAKEUP_TIMES
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init_waitqueue_head(&suspend_stats_queue.wait_queue);
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#endif
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return 0;
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}
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late_initcall(pm_debugfs_init);
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#endif /* CONFIG_DEBUG_FS */
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM_SLEEP_DEBUG
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/*
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* pm_print_times: print time taken by devices to suspend and resume.
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*
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* show() returns whether printing of suspend and resume times is enabled.
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* store() accepts 0 or 1. 0 disables printing and 1 enables it.
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*/
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bool pm_print_times_enabled;
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static ssize_t pm_print_times_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", pm_print_times_enabled);
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}
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static ssize_t pm_print_times_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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unsigned long val;
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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if (val > 1)
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return -EINVAL;
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pm_print_times_enabled = !!val;
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return n;
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}
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power_attr(pm_print_times);
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static inline void pm_print_times_init(void)
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{
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pm_print_times_enabled = !!initcall_debug;
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}
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static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA;
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}
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power_attr_ro(pm_wakeup_irq);
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#else /* !CONFIG_PM_SLEEP_DEBUG */
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static inline void pm_print_times_init(void) {}
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#endif /* CONFIG_PM_SLEEP_DEBUG */
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struct kobject *power_kobj;
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/**
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* state - control system sleep states.
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*
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* show() returns available sleep state labels, which may be "mem", "standby",
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* "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a
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* description of what they mean.
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*
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* store() accepts one of those strings, translates it into the proper
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* enumerated value, and initiates a suspend transition.
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*/
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static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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char *s = buf;
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#ifdef CONFIG_SUSPEND
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suspend_state_t i;
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for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
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if (pm_states[i])
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s += sprintf(s,"%s ", pm_states[i]);
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#endif
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if (hibernation_available())
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s += sprintf(s, "disk ");
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if (s != buf)
|
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/* convert the last space to a newline */
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*(s-1) = '\n';
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return (s - buf);
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}
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|
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static suspend_state_t decode_state(const char *buf, size_t n)
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{
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#ifdef CONFIG_SUSPEND
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suspend_state_t state;
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#endif
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char *p;
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int len;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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/* Check hibernation first. */
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if (len == 4 && !strncmp(buf, "disk", len))
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return PM_SUSPEND_MAX;
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|
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#ifdef CONFIG_SUSPEND
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for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) {
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const char *label = pm_states[state];
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if (label && len == strlen(label) && !strncmp(buf, label, len))
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return state;
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}
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#endif
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return PM_SUSPEND_ON;
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}
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|
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static inline u32
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decay_val(u32 val, u32 percent)
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{
|
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u32 ratio;
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percent = clamp(percent, 0U, 100U);
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ratio = 1024 - ((1024 * percent) / 100);
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return (val * ratio) / 1024;
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}
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static ssize_t sbo_decay_value_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
|
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unsigned long val;
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|
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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|
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if (val > 100)
|
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return -EINVAL;
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|
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sbo_decay_value = val;
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return n;
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}
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|
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static ssize_t sbo_decay_value_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
|
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return snprintf(buf, PAGE_SIZE, "%u\n", sbo_decay_value);
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}
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|
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power_attr(sbo_decay_value);
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|
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static ssize_t sbo_short_sleep_msecs_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t n)
|
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{
|
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unsigned long val;
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|
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if (kstrtoul(buf, 10, &val))
|
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return -EINVAL;
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|
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sbo_short_sleep_msecs = val;
|
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return n;
|
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}
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|
|
static ssize_t sbo_short_sleep_msecs_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", sbo_short_sleep_msecs);
|
|
}
|
|
|
|
power_attr(sbo_short_sleep_msecs);
|
|
|
|
static ssize_t sbo_short_sleep_count_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
sbo_short_sleep_count = val;
|
|
return n;
|
|
}
|
|
|
|
static ssize_t sbo_short_sleep_count_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", sbo_short_sleep_count);
|
|
}
|
|
|
|
power_attr(sbo_short_sleep_count);
|
|
|
|
static ssize_t sbo_initial_alive_time_msecs_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
sbo_initial_alive_time_msecs = val;
|
|
return n;
|
|
}
|
|
|
|
static ssize_t sbo_initial_alive_time_msecs_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", sbo_initial_alive_time_msecs);
|
|
}
|
|
|
|
power_attr(sbo_initial_alive_time_msecs);
|
|
|
|
static ssize_t sbo_enabled_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
if (val > 1)
|
|
return -EINVAL;
|
|
|
|
sbo_enabled = !!val;
|
|
return n;
|
|
}
|
|
|
|
static ssize_t sbo_enabled_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", sbo_enabled);
|
|
}
|
|
|
|
power_attr(sbo_enabled);
|
|
|
|
static void
|
|
suspend_backoff(u32 timeout_msecs)
|
|
{
|
|
if (!sbo_enabled)
|
|
return;
|
|
|
|
pr_info("suspend: too many immediate wakeups, back off (%u msecs)\n",
|
|
timeout_msecs);
|
|
|
|
__pm_wakeup_event(ws, timeout_msecs);
|
|
}
|
|
|
|
static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
suspend_state_t state;
|
|
struct timespec ts_entry, ts_exit;
|
|
u64 elapsed_msecs64;
|
|
u32 elapsed_msecs32;
|
|
int error;
|
|
|
|
error = pm_autosleep_lock();
|
|
if (error)
|
|
return error;
|
|
|
|
if (pm_autosleep_state() > PM_SUSPEND_ON) {
|
|
error = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
state = decode_state(buf, n);
|
|
if (state < PM_SUSPEND_MAX) {
|
|
/*
|
|
* We want to prevent system from frequent periodic wake-ups
|
|
* when sleeping time is less or equal certain interval.
|
|
* It's done in order to save power in certain cases, one of
|
|
* the examples is GPS tracking, but not only.
|
|
*/
|
|
getnstimeofday(&ts_entry);
|
|
error = pm_suspend(state);
|
|
getnstimeofday(&ts_exit);
|
|
|
|
elapsed_msecs64 = timespec_to_ns(&ts_exit) -
|
|
timespec_to_ns(&ts_entry);
|
|
do_div(elapsed_msecs64, NSEC_PER_MSEC);
|
|
elapsed_msecs32 = elapsed_msecs64;
|
|
|
|
if (elapsed_msecs32 <= sbo_short_sleep_msecs) {
|
|
if (suspend_short_count == sbo_short_sleep_count) {
|
|
if (decay_alive_time_ms >= MSEC_PER_SEC) {
|
|
suspend_backoff(decay_alive_time_ms);
|
|
decay_alive_time_ms =
|
|
decay_val(decay_alive_time_ms,
|
|
sbo_decay_value);
|
|
goto out;
|
|
}
|
|
} else {
|
|
suspend_short_count++;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Start from scratch */
|
|
suspend_short_count = 0;
|
|
|
|
/*
|
|
* Randomize a bit an initial alive time value to be
|
|
* not synced with any wake up sources, for example
|
|
* IRQs.
|
|
*/
|
|
decay_alive_time_ms = sbo_initial_alive_time_msecs -
|
|
get_random_int() % (sbo_initial_alive_time_msecs / 10);
|
|
} else if (state == PM_SUSPEND_MAX)
|
|
error = hibernate();
|
|
else
|
|
error = -EINVAL;
|
|
|
|
out:
|
|
pm_autosleep_unlock();
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(state);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/*
|
|
* The 'wakeup_count' attribute, along with the functions defined in
|
|
* drivers/base/power/wakeup.c, provides a means by which wakeup events can be
|
|
* handled in a non-racy way.
|
|
*
|
|
* If a wakeup event occurs when the system is in a sleep state, it simply is
|
|
* woken up. In turn, if an event that would wake the system up from a sleep
|
|
* state occurs when it is undergoing a transition to that sleep state, the
|
|
* transition should be aborted. Moreover, if such an event occurs when the
|
|
* system is in the working state, an attempt to start a transition to the
|
|
* given sleep state should fail during certain period after the detection of
|
|
* the event. Using the 'state' attribute alone is not sufficient to satisfy
|
|
* these requirements, because a wakeup event may occur exactly when 'state'
|
|
* is being written to and may be delivered to user space right before it is
|
|
* frozen, so the event will remain only partially processed until the system is
|
|
* woken up by another event. In particular, it won't cause the transition to
|
|
* a sleep state to be aborted.
|
|
*
|
|
* This difficulty may be overcome if user space uses 'wakeup_count' before
|
|
* writing to 'state'. It first should read from 'wakeup_count' and store
|
|
* the read value. Then, after carrying out its own preparations for the system
|
|
* transition to a sleep state, it should write the stored value to
|
|
* 'wakeup_count'. If that fails, at least one wakeup event has occurred since
|
|
* 'wakeup_count' was read and 'state' should not be written to. Otherwise, it
|
|
* is allowed to write to 'state', but the transition will be aborted if there
|
|
* are any wakeup events detected after 'wakeup_count' was written to.
|
|
*/
|
|
|
|
static ssize_t wakeup_count_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
unsigned int val;
|
|
|
|
return pm_get_wakeup_count(&val, true) ?
|
|
sprintf(buf, "%u\n", val) : -EINTR;
|
|
}
|
|
|
|
static ssize_t wakeup_count_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned int val;
|
|
int error;
|
|
|
|
error = pm_autosleep_lock();
|
|
if (error)
|
|
return error;
|
|
|
|
if (pm_autosleep_state() > PM_SUSPEND_ON) {
|
|
error = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
error = -EINVAL;
|
|
if (sscanf(buf, "%u", &val) == 1) {
|
|
if (pm_save_wakeup_count(val))
|
|
error = n;
|
|
else
|
|
pm_print_active_wakeup_sources();
|
|
}
|
|
|
|
out:
|
|
pm_autosleep_unlock();
|
|
return error;
|
|
}
|
|
|
|
power_attr(wakeup_count);
|
|
|
|
#ifdef CONFIG_PM_AUTOSLEEP
|
|
static ssize_t autosleep_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
suspend_state_t state = pm_autosleep_state();
|
|
|
|
if (state == PM_SUSPEND_ON)
|
|
return sprintf(buf, "off\n");
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
if (state < PM_SUSPEND_MAX)
|
|
return sprintf(buf, "%s\n", pm_states[state] ?
|
|
pm_states[state] : "error");
|
|
#endif
|
|
#ifdef CONFIG_HIBERNATION
|
|
return sprintf(buf, "disk\n");
|
|
#else
|
|
return sprintf(buf, "error");
|
|
#endif
|
|
}
|
|
|
|
static ssize_t autosleep_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
suspend_state_t state = decode_state(buf, n);
|
|
int error;
|
|
|
|
if (state == PM_SUSPEND_ON
|
|
&& strcmp(buf, "off") && strcmp(buf, "off\n"))
|
|
return -EINVAL;
|
|
|
|
error = pm_autosleep_set_state(state);
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(autosleep);
|
|
#endif /* CONFIG_PM_AUTOSLEEP */
|
|
|
|
#ifdef CONFIG_PM_WAKELOCKS
|
|
static ssize_t wake_lock_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return pm_show_wakelocks(buf, true);
|
|
}
|
|
|
|
static ssize_t wake_lock_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
int error = pm_wake_lock(buf);
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(wake_lock);
|
|
|
|
static ssize_t wake_unlock_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return pm_show_wakelocks(buf, false);
|
|
}
|
|
|
|
static ssize_t wake_unlock_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
int error = pm_wake_unlock(buf);
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(wake_unlock);
|
|
|
|
#endif /* CONFIG_PM_WAKELOCKS */
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
#ifdef CONFIG_PM_TRACE
|
|
int pm_trace_enabled;
|
|
|
|
static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", pm_trace_enabled);
|
|
}
|
|
|
|
static ssize_t
|
|
pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
int val;
|
|
|
|
if (sscanf(buf, "%d", &val) == 1) {
|
|
pm_trace_enabled = !!val;
|
|
if (pm_trace_enabled) {
|
|
pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n"
|
|
"PM: Correct system time has to be restored manually after resume.\n");
|
|
}
|
|
return n;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
power_attr(pm_trace);
|
|
|
|
static ssize_t pm_trace_dev_match_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return show_trace_dev_match(buf, PAGE_SIZE);
|
|
}
|
|
|
|
power_attr_ro(pm_trace_dev_match);
|
|
|
|
#endif /* CONFIG_PM_TRACE */
|
|
|
|
#ifdef CONFIG_FREEZER
|
|
static ssize_t pm_freeze_timeout_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%u\n", freeze_timeout_msecs);
|
|
}
|
|
|
|
static ssize_t pm_freeze_timeout_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
freeze_timeout_msecs = val;
|
|
return n;
|
|
}
|
|
|
|
power_attr(pm_freeze_timeout);
|
|
|
|
#endif /* CONFIG_FREEZER*/
|
|
|
|
static struct attribute * g[] = {
|
|
&state_attr.attr,
|
|
#ifdef CONFIG_PM_TRACE
|
|
&pm_trace_attr.attr,
|
|
&pm_trace_dev_match_attr.attr,
|
|
#endif
|
|
#ifdef CONFIG_PM_SLEEP
|
|
&pm_async_attr.attr,
|
|
&wakeup_count_attr.attr,
|
|
&sbo_enabled_attr.attr,
|
|
&sbo_decay_value_attr.attr,
|
|
&sbo_short_sleep_msecs_attr.attr,
|
|
&sbo_short_sleep_count_attr.attr,
|
|
&sbo_initial_alive_time_msecs_attr.attr,
|
|
#ifdef CONFIG_PM_AUTOSLEEP
|
|
&autosleep_attr.attr,
|
|
#endif
|
|
#ifdef CONFIG_PM_WAKELOCKS
|
|
&wake_lock_attr.attr,
|
|
&wake_unlock_attr.attr,
|
|
#endif
|
|
#ifdef CONFIG_PM_DEBUG
|
|
&pm_test_attr.attr,
|
|
#endif
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG
|
|
&pm_print_times_attr.attr,
|
|
&pm_wakeup_irq_attr.attr,
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_FREEZER
|
|
&pm_freeze_timeout_attr.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group attr_group = {
|
|
.attrs = g,
|
|
};
|
|
|
|
struct workqueue_struct *pm_wq;
|
|
EXPORT_SYMBOL_GPL(pm_wq);
|
|
|
|
static int __init pm_start_workqueue(void)
|
|
{
|
|
pm_wq = alloc_workqueue("pm", WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
|
|
|
|
return pm_wq ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int __init pm_init(void)
|
|
{
|
|
int error = pm_start_workqueue();
|
|
if (error)
|
|
return error;
|
|
hibernate_image_size_init();
|
|
hibernate_reserved_size_init();
|
|
pm_states_init();
|
|
power_kobj = kobject_create_and_add("power", NULL);
|
|
if (!power_kobj)
|
|
return -ENOMEM;
|
|
error = sysfs_create_group(power_kobj, &attr_group);
|
|
if (error)
|
|
return error;
|
|
pm_print_times_init();
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
ws = wakeup_source_register("suspend_backoff");
|
|
#endif
|
|
return pm_autosleep_init();
|
|
}
|
|
|
|
core_initcall(pm_init);
|