PM: Enable early suspend through /sys/power/state
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.
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2981af4..dad38e2 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -170,7 +170,11 @@
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;
@@ -192,8 +196,15 @@
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:
return error ? error : n;
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 1c41ba2..63774df 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -28,6 +28,9 @@
#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",
};