Is there any signal or notification when system suspends?

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Hi Everybody,
 
I want to save my driver status/context when system goes to suspend mode. And, resume when my system comes live. Mine is aHID-USB device. And driver is a user mode driver.
 
Does system send any signal or any other notification whenever is goes to suspend mode?  Or any other mechanism that I can use for this.
 
Thanks and Regards
Mukesh

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