/*
|
* kernel/power/main.c - PM subsystem core functionality.
|
*
|
* Copyright (c) 2003 Patrick Mochel
|
* Copyright (c) 2003 Open Source Development Lab
|
*
|
* This file is released under the GPLv2
|
*
|
*/
|
|
#include <linux/export.h>
|
#include <linux/kobject.h>
|
#include <linux/string.h>
|
#include <linux/pm-trace.h>
|
#include <linux/workqueue.h>
|
#include <linux/debugfs.h>
|
#include <linux/seq_file.h>
|
#include <linux/suspend.h>
|
|
#include "power.h"
|
|
#ifdef CONFIG_PM_SLEEP
|
|
void lock_system_sleep(void)
|
{
|
current->flags |= PF_FREEZER_SKIP;
|
mutex_lock(&system_transition_mutex);
|
}
|
EXPORT_SYMBOL_GPL(lock_system_sleep);
|
|
void unlock_system_sleep(void)
|
{
|
/*
|
* Don't use freezer_count() because we don't want the call to
|
* try_to_freeze() here.
|
*
|
* Reason:
|
* Fundamentally, we just don't need it, because freezing condition
|
* doesn't come into effect until we release the
|
* system_transition_mutex lock, since the freezer always works with
|
* system_transition_mutex held.
|
*
|
* More importantly, in the case of hibernation,
|
* unlock_system_sleep() gets called in snapshot_read() and
|
* snapshot_write() when the freezing condition is still in effect.
|
* Which means, if we use try_to_freeze() here, it would make them
|
* enter the refrigerator, thus causing hibernation to lockup.
|
*/
|
current->flags &= ~PF_FREEZER_SKIP;
|
mutex_unlock(&system_transition_mutex);
|
}
|
EXPORT_SYMBOL_GPL(unlock_system_sleep);
|
|
/* 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);
|
|
int __pm_notifier_call_chain(unsigned long val, int nr_to_call, int *nr_calls)
|
{
|
int ret;
|
|
ret = __blocking_notifier_call_chain(&pm_chain_head, val, NULL,
|
nr_to_call, nr_calls);
|
|
return notifier_to_errno(ret);
|
}
|
int pm_notifier_call_chain(unsigned long val)
|
{
|
return __pm_notifier_call_chain(val, -1, NULL);
|
}
|
|
/* 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\n", 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;
|
|
if (kstrtoul(buf, 10, &val))
|
return -EINVAL;
|
|
if (val > 1)
|
return -EINVAL;
|
|
pm_async_enabled = val;
|
return n;
|
}
|
|
power_attr(pm_async);
|
|
#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) = '\n';
|
|
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', 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 */
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG
|
int pm_test_level = TEST_NONE;
|
|
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",
|
};
|
|
static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
|
char *buf)
|
{
|
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) = '\n';
|
|
return (s - buf);
|
}
|
|
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
|
const char *buf, size_t n)
|
{
|
const char * const *s;
|
int level;
|
char *p;
|
int len;
|
int error = -EINVAL;
|
|
p = memchr(buf, '\n', n);
|
len = p ? p - buf : n;
|
|
lock_system_sleep();
|
|
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;
|
}
|
|
unlock_system_sleep();
|
|
return error ? error : n;
|
}
|
|
power_attr(pm_test);
|
#endif /* CONFIG_PM_SLEEP_DEBUG */
|
|
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 "";
|
}
|
}
|
|
#define suspend_attr(_name) \
|
static ssize_t _name##_show(struct kobject *kobj, \
|
struct kobj_attribute *attr, char *buf) \
|
{ \
|
return sprintf(buf, "%d\n", suspend_stats._name); \
|
} \
|
static struct kobj_attribute _name = __ATTR_RO(_name)
|
|
suspend_attr(success);
|
suspend_attr(fail);
|
suspend_attr(failed_freeze);
|
suspend_attr(failed_prepare);
|
suspend_attr(failed_suspend);
|
suspend_attr(failed_suspend_late);
|
suspend_attr(failed_suspend_noirq);
|
suspend_attr(failed_resume);
|
suspend_attr(failed_resume_early);
|
suspend_attr(failed_resume_noirq);
|
|
static ssize_t last_failed_dev_show(struct kobject *kobj,
|
struct kobj_attribute *attr, char *buf)
|
{
|
int index;
|
char *last_failed_dev = NULL;
|
|
index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
|
index %= REC_FAILED_NUM;
|
last_failed_dev = suspend_stats.failed_devs[index];
|
|
return sprintf(buf, "%s\n", last_failed_dev);
|
}
|
static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev);
|
|
static ssize_t last_failed_errno_show(struct kobject *kobj,
|
struct kobj_attribute *attr, char *buf)
|
{
|
int index;
|
int last_failed_errno;
|
|
index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1;
|
index %= REC_FAILED_NUM;
|
last_failed_errno = suspend_stats.errno[index];
|
|
return sprintf(buf, "%d\n", last_failed_errno);
|
}
|
static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno);
|
|
static ssize_t last_failed_step_show(struct kobject *kobj,
|
struct kobj_attribute *attr, char *buf)
|
{
|
int index;
|
enum suspend_stat_step step;
|
char *last_failed_step = NULL;
|
|
index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
|
index %= REC_FAILED_NUM;
|
step = suspend_stats.failed_steps[index];
|
last_failed_step = suspend_step_name(step);
|
|
return sprintf(buf, "%s\n", last_failed_step);
|
}
|
static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step);
|
|
static struct attribute *suspend_attrs[] = {
|
&success.attr,
|
&fail.attr,
|
&failed_freeze.attr,
|
&failed_prepare.attr,
|
&failed_suspend.attr,
|
&failed_suspend_late.attr,
|
&failed_suspend_noirq.attr,
|
&failed_resume.attr,
|
&failed_resume_early.attr,
|
&failed_resume_noirq.attr,
|
&last_failed_dev.attr,
|
&last_failed_errno.attr,
|
&last_failed_step.attr,
|
NULL,
|
};
|
|
static struct attribute_group suspend_attr_group = {
|
.name = "suspend_stats",
|
.attrs = suspend_attrs,
|
};
|
|
#ifdef CONFIG_DEBUG_FS
|
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;
|
seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
|
"%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
|
"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,
|
"failed_suspend_late",
|
suspend_stats.failed_suspend_late,
|
"failed_suspend_noirq",
|
suspend_stats.failed_suspend_noirq,
|
"failed_resume", suspend_stats.failed_resume,
|
"failed_resume_early",
|
suspend_stats.failed_resume_early,
|
"failed_resume_noirq",
|
suspend_stats.failed_resume_noirq);
|
seq_printf(s, "failures:\n last_failed_dev:\t%-s\n",
|
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\n",
|
suspend_stats.failed_devs[index]);
|
}
|
seq_printf(s, " last_failed_errno:\t%-d\n",
|
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\n",
|
suspend_stats.errno[index]);
|
}
|
seq_printf(s, " last_failed_step:\t%-s\n",
|
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\n",
|
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 */
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
#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\n", 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;
|
}
|
|
static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
|
struct kobj_attribute *attr,
|
char *buf)
|
{
|
return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA;
|
}
|
|
power_attr_ro(pm_wakeup_irq);
|
|
bool pm_debug_messages_on __read_mostly;
|
|
static ssize_t pm_debug_messages_show(struct kobject *kobj,
|
struct kobj_attribute *attr, char *buf)
|
{
|
return sprintf(buf, "%d\n", 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);
|
|
/**
|
* __pm_pr_dbg - Print a suspend debug message to the kernel log.
|
* @defer: Whether or not to use printk_deferred() to print the message.
|
* @fmt: Message format.
|
*
|
* The message will be emitted if enabled through the pm_debug_messages
|
* sysfs attribute.
|
*/
|
void __pm_pr_dbg(bool defer, const char *fmt, ...)
|
{
|
struct va_format vaf;
|
va_list args;
|
|
if (!pm_debug_messages_on)
|
return;
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
vaf.va = &args;
|
|
if (defer)
|
printk_deferred(KERN_DEBUG "PM: %pV", &vaf);
|
else
|
printk(KERN_DEBUG "PM: %pV", &vaf);
|
|
va_end(args);
|
}
|
|
#else /* !CONFIG_PM_SLEEP_DEBUG */
|
static inline void pm_print_times_init(void) {}
|
#endif /* CONFIG_PM_SLEEP_DEBUG */
|
|
struct kobject *power_kobj;
|
EXPORT_SYMBOL_GPL(power_kobj);
|
|
/**
|
* state - control system sleep states.
|
*
|
* show() returns available sleep state labels, which may be "mem", "standby",
|
* "freeze" and "disk" (hibernation).
|
* See Documentation/admin-guide/pm/sleep-states.rst for a description of
|
* what they mean.
|
*
|
* store() accepts one of those strings, translates it into the proper
|
* enumerated value, and initiates a suspend transition.
|
*/
|
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
|
char *buf)
|
{
|
char *s = buf;
|
#ifdef CONFIG_SUSPEND
|
suspend_state_t i;
|
|
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
|
if (pm_states[i])
|
s += sprintf(s,"%s ", pm_states[i]);
|
|
#endif
|
if (hibernation_available())
|
s += sprintf(s, "disk ");
|
if (s != buf)
|
/* convert the last space to a newline */
|
*(s-1) = '\n';
|
return (s - buf);
|
}
|
|
static suspend_state_t decode_state(const char *buf, size_t n)
|
{
|
#ifdef CONFIG_SUSPEND
|
suspend_state_t state;
|
#endif
|
char *p;
|
int len;
|
|
p = memchr(buf, '\n', n);
|
len = p ? p - buf : n;
|
|
/* Check hibernation first. */
|
if (len == 4 && !strncmp(buf, "disk", len))
|
return PM_SUSPEND_MAX;
|
|
#ifdef CONFIG_SUSPEND
|
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;
|
}
|
#endif
|
|
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);
|
if (state < PM_SUSPEND_MAX) {
|
if (state == PM_SUSPEND_MEM)
|
state = mem_sleep_current;
|
|
error = pm_suspend(state);
|
} 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;
|
|
if (state == PM_SUSPEND_MEM)
|
state = mem_sleep_current;
|
|
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,
|
#ifdef CONFIG_SUSPEND
|
&mem_sleep_attr.attr,
|
#endif
|
#ifdef CONFIG_PM_AUTOSLEEP
|
&autosleep_attr.attr,
|
#endif
|
#ifdef CONFIG_PM_WAKELOCKS
|
&wake_lock_attr.attr,
|
&wake_unlock_attr.attr,
|
#endif
|
#ifdef CONFIG_PM_SLEEP_DEBUG
|
&pm_test_attr.attr,
|
&pm_print_times_attr.attr,
|
&pm_wakeup_irq_attr.attr,
|
&pm_debug_messages_attr.attr,
|
#endif
|
#endif
|
#ifdef CONFIG_FREEZER
|
&pm_freeze_timeout_attr.attr,
|
#endif
|
NULL,
|
};
|
|
static const struct attribute_group attr_group = {
|
.attrs = g,
|
};
|
|
static const struct attribute_group *attr_groups[] = {
|
&attr_group,
|
#ifdef CONFIG_PM_SLEEP
|
&suspend_attr_group,
|
#endif
|
NULL,
|
};
|
|
struct workqueue_struct *pm_wq;
|
EXPORT_SYMBOL_GPL(pm_wq);
|
|
static int __init pm_start_workqueue(void)
|
{
|
pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 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_groups(power_kobj, attr_groups);
|
if (error)
|
return error;
|
pm_print_times_init();
|
return pm_autosleep_init();
|
}
|
|
core_initcall(pm_init);
|
