What:		/sys/kernel/wakeup_reasons/last_resume_reason
Date:		February 2014
Contact:	Ruchi Kandoi <kandoiruchi@google.com>
Description:
		The /sys/kernel/wakeup_reasons/last_resume_reason is
		used to report wakeup reasons after system exited suspend.

What:		/sys/kernel/wakeup_reasons/last_suspend_time
Date:		March 2015
Contact:	jinqian <jinqian@google.com>
Description:
		The /sys/kernel/wakeup_reasons/last_suspend_time is
		used to report time spent in last suspend cycle. It contains
		two numbers (in seconds) separated by space. First number is
		the time spent in suspend and resume processes. Second number
		is the time spent in sleep state.