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kernel/power/main.c
18.1 KB
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/* * kernel/power/main.c - PM subsystem core functionality. * * Copyright (c) 2003 Patrick Mochel * 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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#include <linux/export.h> |
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#include <linux/kobject.h> #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> #include <linux/seq_file.h> |
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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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/* Routines for PM-transition notifications */ static BLOCKING_NOTIFIER_HEAD(pm_chain_head); int register_pm_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&pm_chain_head, nb); } EXPORT_SYMBOL_GPL(register_pm_notifier); int unregister_pm_notifier(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&pm_chain_head, nb); } 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; ret = __blocking_notifier_call_chain(&pm_chain_head, val, NULL, 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) { return __pm_notifier_call_chain(val, -1, NULL); } |
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/* If set, devices may be suspended and resumed asynchronously. */ int pm_async_enabled = 1; static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", pm_async_enabled); } static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { unsigned long val; |
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if (kstrtoul(buf, 10, &val)) |
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return -EINVAL; if (val > 1) return -EINVAL; pm_async_enabled = val; return n; } power_attr(pm_async); |
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#ifdef CONFIG_SUSPEND static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *s = buf; suspend_state_t i; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) if (mem_sleep_states[i]) { const char *label = mem_sleep_states[i]; if (mem_sleep_current == i) s += sprintf(s, "[%s] ", label); else s += sprintf(s, "%s ", label); } /* Convert the last space to a newline if needed. */ if (s != buf) *(s-1) = ' '; return (s - buf); } static suspend_state_t decode_suspend_state(const char *buf, size_t n) { suspend_state_t state; char *p; int len; p = memchr(buf, ' ', n); len = p ? p - buf : n; for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { const char *label = mem_sleep_states[state]; if (label && len == strlen(label) && !strncmp(buf, label, len)) return state; } return PM_SUSPEND_ON; } static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { suspend_state_t state; int error; error = pm_autosleep_lock(); if (error) return error; if (pm_autosleep_state() > PM_SUSPEND_ON) { error = -EBUSY; goto out; } state = decode_suspend_state(buf, n); if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) mem_sleep_current = state; else error = -EINVAL; out: pm_autosleep_unlock(); return error ? error : n; } power_attr(mem_sleep); #endif /* CONFIG_SUSPEND */ |
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#ifdef CONFIG_PM_SLEEP_DEBUG |
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int pm_test_level = TEST_NONE; |
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static const char * const pm_tests[__TEST_AFTER_LAST] = { [TEST_NONE] = "none", [TEST_CORE] = "core", [TEST_CPUS] = "processors", [TEST_PLATFORM] = "platform", [TEST_DEVICES] = "devices", [TEST_FREEZER] = "freezer", }; |
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static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
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{ char *s = buf; int level; for (level = TEST_FIRST; level <= TEST_MAX; level++) if (pm_tests[level]) { if (level == pm_test_level) s += sprintf(s, "[%s] ", pm_tests[level]); else s += sprintf(s, "%s ", pm_tests[level]); } if (s != buf) /* convert the last space to a newline */ *(s-1) = ' '; return (s - buf); } |
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static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) |
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{ const char * const *s; int level; char *p; int len; int error = -EINVAL; p = memchr(buf, ' ', n); len = p ? p - buf : n; |
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lock_system_sleep(); |
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level = TEST_FIRST; for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { pm_test_level = level; error = 0; break; } |
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unlock_system_sleep(); |
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return error ? error : n; } power_attr(pm_test); |
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#endif /* CONFIG_PM_SLEEP_DEBUG */ |
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#ifdef CONFIG_DEBUG_FS static char *suspend_step_name(enum suspend_stat_step step) { switch (step) { case SUSPEND_FREEZE: return "freeze"; case SUSPEND_PREPARE: return "prepare"; case SUSPEND_SUSPEND: return "suspend"; case SUSPEND_SUSPEND_NOIRQ: return "suspend_noirq"; case SUSPEND_RESUME_NOIRQ: return "resume_noirq"; case SUSPEND_RESUME: return "resume"; default: return ""; } } static int suspend_stats_show(struct seq_file *s, void *unused) { int i, index, last_dev, last_errno, last_step; last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; last_dev %= REC_FAILED_NUM; last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; last_errno %= REC_FAILED_NUM; last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; last_step %= REC_FAILED_NUM; |
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seq_printf(s, "%s: %d %s: %d %s: %d %s: %d %s: %d " "%s: %d %s: %d %s: %d %s: %d %s: %d ", |
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"success", suspend_stats.success, "fail", suspend_stats.fail, "failed_freeze", suspend_stats.failed_freeze, "failed_prepare", suspend_stats.failed_prepare, "failed_suspend", suspend_stats.failed_suspend, |
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"failed_suspend_late", suspend_stats.failed_suspend_late, |
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"failed_suspend_noirq", suspend_stats.failed_suspend_noirq, "failed_resume", suspend_stats.failed_resume, |
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"failed_resume_early", suspend_stats.failed_resume_early, |
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"failed_resume_noirq", suspend_stats.failed_resume_noirq); seq_printf(s, "failures: last_failed_dev:\t%-s ", suspend_stats.failed_devs[last_dev]); for (i = 1; i < REC_FAILED_NUM; i++) { index = last_dev + REC_FAILED_NUM - i; index %= REC_FAILED_NUM; seq_printf(s, "\t\t\t%-s ", suspend_stats.failed_devs[index]); } seq_printf(s, " last_failed_errno:\t%-d ", suspend_stats.errno[last_errno]); for (i = 1; i < REC_FAILED_NUM; i++) { index = last_errno + REC_FAILED_NUM - i; index %= REC_FAILED_NUM; seq_printf(s, "\t\t\t%-d ", suspend_stats.errno[index]); } seq_printf(s, " last_failed_step:\t%-s ", suspend_step_name( suspend_stats.failed_steps[last_step])); for (i = 1; i < REC_FAILED_NUM; i++) { index = last_step + REC_FAILED_NUM - i; index %= REC_FAILED_NUM; seq_printf(s, "\t\t\t%-s ", suspend_step_name( suspend_stats.failed_steps[index])); } return 0; } static int suspend_stats_open(struct inode *inode, struct file *file) { return single_open(file, suspend_stats_show, NULL); } static const struct file_operations suspend_stats_operations = { .open = suspend_stats_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init pm_debugfs_init(void) { debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, NULL, NULL, &suspend_stats_operations); return 0; } late_initcall(pm_debugfs_init); #endif /* CONFIG_DEBUG_FS */ |
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#endif /* CONFIG_PM_SLEEP */ |
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#ifdef CONFIG_PM_SLEEP_DEBUG /* * pm_print_times: print time taken by devices to suspend and resume. * * show() returns whether printing of suspend and resume times is enabled. * store() accepts 0 or 1. 0 disables printing and 1 enables it. */ bool pm_print_times_enabled; static ssize_t pm_print_times_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", pm_print_times_enabled); } static ssize_t pm_print_times_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; pm_print_times_enabled = !!val; return n; } power_attr(pm_print_times); static inline void pm_print_times_init(void) { pm_print_times_enabled = !!initcall_debug; } |
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static ssize_t pm_wakeup_irq_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return pm_wakeup_irq ? sprintf(buf, "%u ", pm_wakeup_irq) : -ENODATA; } |
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power_attr_ro(pm_wakeup_irq); |
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bool pm_debug_messages_on __read_mostly; |
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static ssize_t pm_debug_messages_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", pm_debug_messages_on); } static ssize_t pm_debug_messages_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; pm_debug_messages_on = !!val; return n; } power_attr(pm_debug_messages); /** |
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* __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message. |
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* @fmt: Message format. * * The message will be emitted if enabled through the pm_debug_messages * sysfs attribute. */ |
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void __pm_pr_dbg(bool defer, const char *fmt, ...) |
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{ struct va_format vaf; va_list args; if (!pm_debug_messages_on) return; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; |
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if (defer) printk_deferred(KERN_DEBUG "PM: %pV", &vaf); else printk(KERN_DEBUG "PM: %pV", &vaf); |
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va_end(args); } |
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#else /* !CONFIG_PM_SLEEP_DEBUG */ |
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static inline void pm_print_times_init(void) {} #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", * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a * description of what they mean. |
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* |
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* store() accepts one of those strings, translates it into the proper * 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, char *buf) |
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{ |
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char *s = buf; #ifdef CONFIG_SUSPEND |
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suspend_state_t i; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) |
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if (pm_states[i]) s += sprintf(s,"%s ", pm_states[i]); |
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#endif |
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if (hibernation_available()) s += sprintf(s, "disk "); |
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if (s != buf) /* convert the last space to a newline */ *(s-1) = ' '; |
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return (s - buf); } |
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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; p = memchr(buf, ' ', n); len = p ? p - buf : n; |
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/* Check hibernation first. */ if (len == 4 && !strncmp(buf, "disk", len)) return PM_SUSPEND_MAX; |
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#ifdef CONFIG_SUSPEND |
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for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { const char *label = pm_states[state]; if (label && len == strlen(label) && !strncmp(buf, label, len)) return state; } |
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#endif |
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return PM_SUSPEND_ON; } static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { suspend_state_t state; 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); |
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if (state < PM_SUSPEND_MAX) { if (state == PM_SUSPEND_MEM) state = mem_sleep_current; |
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error = pm_suspend(state); |
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} else if (state == PM_SUSPEND_MAX) { |
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error = hibernate(); |
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} else { |
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error = -EINVAL; |
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} |
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out: pm_autosleep_unlock(); |
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return error ? error : n; } power_attr(state); |
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#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 |
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* 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
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* '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) { |
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unsigned int val; |
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return pm_get_wakeup_count(&val, true) ? sprintf(buf, "%u ", val) : -EINTR; |
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} static ssize_t wakeup_count_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { |
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unsigned int val; |
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int error; error = pm_autosleep_lock(); if (error) return error; |
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if (pm_autosleep_state() > PM_SUSPEND_ON) { error = -EBUSY; goto out; } error = -EINVAL; |
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if (sscanf(buf, "%u", &val) == 1) { |
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if (pm_save_wakeup_count(val)) |
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error = n; |
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else pm_print_active_wakeup_sources(); |
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} |
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out: pm_autosleep_unlock(); return error; |
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} power_attr(wakeup_count); |
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#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 "); #ifdef CONFIG_SUSPEND if (state < PM_SUSPEND_MAX) |
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return sprintf(buf, "%s ", pm_states[state] ? pm_states[state] : "error"); |
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#endif #ifdef CONFIG_HIBERNATION return sprintf(buf, "disk "); #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 |
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&& strcmp(buf, "off") && strcmp(buf, "off ")) |
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return -EINVAL; |
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if (state == PM_SUSPEND_MEM) state = mem_sleep_current; |
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error = pm_autosleep_set_state(state); return error ? error : n; } power_attr(autosleep); #endif /* CONFIG_PM_AUTOSLEEP */ |
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#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 */ |
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#endif /* CONFIG_PM_SLEEP */ |
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#ifdef CONFIG_PM_TRACE int pm_trace_enabled; |
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static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
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{ return sprintf(buf, "%d ", pm_trace_enabled); } static ssize_t |
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pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) |
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{ int val; if (sscanf(buf, "%d", &val) == 1) { pm_trace_enabled = !!val; |
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if (pm_trace_enabled) { pr_warn("PM: Enabling pm_trace changes system date and time during resume. " "PM: Correct system time has to be restored manually after resume. "); } |
c5c6ba4e0
|
696 697 698 699 700 701 |
return n; } return -EINVAL; } power_attr(pm_trace); |
d33ac60be
|
702 703 704 705 706 707 708 |
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); } |
a1e9ca696
|
709 |
power_attr_ro(pm_trace_dev_match); |
d33ac60be
|
710 |
|
0e7d56e3d
|
711 |
#endif /* CONFIG_PM_TRACE */ |
c5c6ba4e0
|
712 |
|
957d1282b
|
713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 |
#ifdef CONFIG_FREEZER static ssize_t pm_freeze_timeout_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%u ", 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*/ |
c5c6ba4e0
|
737 738 |
static struct attribute * g[] = { &state_attr.attr, |
0e7d56e3d
|
739 |
#ifdef CONFIG_PM_TRACE |
c5c6ba4e0
|
740 |
&pm_trace_attr.attr, |
d33ac60be
|
741 |
&pm_trace_dev_match_attr.attr, |
0e7d56e3d
|
742 |
#endif |
0e06b4a89
|
743 744 |
#ifdef CONFIG_PM_SLEEP &pm_async_attr.attr, |
c125e96f0
|
745 |
&wakeup_count_attr.attr, |
406e79385
|
746 747 748 |
#ifdef CONFIG_SUSPEND &mem_sleep_attr.attr, #endif |
7483b4a4d
|
749 750 751 |
#ifdef CONFIG_PM_AUTOSLEEP &autosleep_attr.attr, #endif |
b86ff9820
|
752 753 754 755 |
#ifdef CONFIG_PM_WAKELOCKS &wake_lock_attr.attr, &wake_unlock_attr.attr, #endif |
b2df1d4f8
|
756 |
#ifdef CONFIG_PM_SLEEP_DEBUG |
e516a1db4
|
757 |
&pm_test_attr.attr, |
4b7760ba0
|
758 |
&pm_print_times_attr.attr, |
a6f5f0dd4
|
759 |
&pm_wakeup_irq_attr.attr, |
8d8b2441d
|
760 |
&pm_debug_messages_attr.attr, |
0e7d56e3d
|
761 |
#endif |
0e06b4a89
|
762 |
#endif |
957d1282b
|
763 764 765 |
#ifdef CONFIG_FREEZER &pm_freeze_timeout_attr.attr, #endif |
c5c6ba4e0
|
766 767 |
NULL, }; |
1da177e4c
|
768 |
|
1d0c6e593
|
769 |
static const struct attribute_group attr_group = { |
1da177e4c
|
770 771 |
.attrs = g, }; |
5e928f77a
|
772 |
struct workqueue_struct *pm_wq; |
7b199ca20
|
773 |
EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77a
|
774 775 776 |
static int __init pm_start_workqueue(void) { |
58a69cb47
|
777 |
pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77a
|
778 779 780 |
return pm_wq ? 0 : -ENOMEM; } |
5e928f77a
|
781 |
|
1da177e4c
|
782 783 |
static int __init pm_init(void) { |
5e928f77a
|
784 785 786 |
int error = pm_start_workqueue(); if (error) return error; |
ac5c24ec1
|
787 |
hibernate_image_size_init(); |
ddeb64870
|
788 |
hibernate_reserved_size_init(); |
fa7fd6fa3
|
789 |
pm_states_init(); |
d76e15fb2
|
790 791 |
power_kobj = kobject_create_and_add("power", NULL); if (!power_kobj) |
039a5dcd2
|
792 |
return -ENOMEM; |
7483b4a4d
|
793 794 795 |
error = sysfs_create_group(power_kobj, &attr_group); if (error) return error; |
b2df1d4f8
|
796 |
pm_print_times_init(); |
7483b4a4d
|
797 |
return pm_autosleep_init(); |
1da177e4c
|
798 799 800 |
} core_initcall(pm_init); |