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PM: Enable early suspend through /sys/power/state

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If EARLYSUSPEND is enabled then writes to /sys/power/state no longer
blocks, and the kernel will try to enter the requested state every
time no wakelocks are held. Write "on" to resume normal operation.
This commit is contained in:
Arve Hjønnevåg
2008-10-09 19:17:11 -07:00
parent 74643fdcc3
commit 5f36bdf159
2 changed files with 14 additions and 0 deletions
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11
kernel/power/main.c
View File

@@ -147,7 +147,11 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
#ifdef CONFIG_SUSPEND
#ifdef CONFIG_EARLYSUSPEND
suspend_state_t state = PM_SUSPEND_ON;
#else
suspend_state_t state = PM_SUSPEND_STANDBY;
#endif
const char * const *s;
#endif
char *p;
@@ -169,7 +173,14 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
break;
}
if (state < PM_SUSPEND_MAX && *s)
#ifdef CONFIG_EARLYSUSPEND
if (state == PM_SUSPEND_ON || valid_state(state)) {
error = 0;
request_suspend_state(state);
}
#else
error = enter_state(state);
#endif
#endif
Exit:

3
kernel/power/suspend.c
View File

@@ -19,6 +19,9 @@
#include "power.h"
const char *const pm_states[PM_SUSPEND_MAX] = {
#ifdef CONFIG_EARLYSUSPEND
[PM_SUSPEND_ON] = "on",
#endif
[PM_SUSPEND_STANDBY] = "standby",
[PM_SUSPEND_MEM] = "mem",
};