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PM: Add a switch for disabling/enabling asynchronous suspend/resume

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Add sysfs attribute /sys/power/pm_async allowing the user space to
disable/enable asynchronous suspend/resume of devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki
2010-01-23 22:25:15 +01:00
parent 5af84b8270
commit 0e06b4a891
4 changed files with 50 additions and 7 deletions
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31
kernel/power/main.c
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@@ -44,6 +44,32 @@ int pm_notifier_call_chain(unsigned long val)
== NOTIFY_BAD) ? -EINVAL : 0;
}
/* 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 (strict_strtoul(buf, 10, &val))
return -EINVAL;
if (val > 1)
return -EINVAL;
pm_async_enabled = val;
return n;
}
power_attr(pm_async);
#ifdef CONFIG_PM_DEBUG
int pm_test_level = TEST_NONE;
@@ -208,8 +234,11 @@ static struct attribute * g[] = {
#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
#endif
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
#ifdef CONFIG_PM_SLEEP
&pm_async_attr.attr,
#ifdef CONFIG_PM_DEBUG
&pm_test_attr.attr,
#endif
#endif
NULL,
};