ACPI support for add-on devices driver

Hi all,

I like know what I need to do if I want to have ACPI power management support in my driver for an add-on device. When I am browsing APM implementation, I found that Linux kernel have general PM Interfaces like pm_regsiter and pm_unregsiter. In APM driver, pm_send is being called to send notification to all registered add-on devices.

In the case of ACPI, we have Device power state D0,D1,D2,D3. I like to know how the interface between the ACPI driver, PM interface and ADD-ON Driver happens.
Can any one please send me some details about it?

Thanks,
Siva