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Re: Unload driver on sleep?

At 8:18 AM -0800 11/4/03, Shawn Erickson wrote:
On Nov 4, 2003, at 3:32 AM, Jim Wintermyre wrote:

I have a PCI driver which doesn't support deep sleep, because... well, we haven't had time to implement proper support for it yet. However, if there are no clients of the driver, I can simply remove the driver, then put the machine to sleep, then reinstall the driver after the machine is woken up. i.e.:

"sudo kextunload -b com.mycompany.driver.myPCIdriver" before sleep, and
"sudo kextload /System/Library/Extensions/MyDriver.kext" after sleep

But of course this is not an ideal set of hoops to jump through from a user perspective. So, I'm wondering if, as an interim fix, I could do something to cause the same effect to happen in a sleep handler. I assume it's not as trivial as just manually calling my driver's stop()/start() functions... Basically I want to do this:

- On sleep request, if clients are attached then refuse deep sleep. If no clients are attached, do the same thing that would happen if the driver was unloaded, and allow deep sleep.

- On wake, do the same thing as when the driver is loaded normally.

Any ideas?

Implement power management support in your driver... that is the best way. You already seem to have an idea on what you need to do (on power down save state as needed, on power up restore state, etc.). Apple's IOKit documentation covers power management [1] and how to support it [2].

Thanks for the references... but that's the point. I don't have time to implement "real" power management support right now (i.e. saving/restoring device state). I can do something quick and dirty, which is to basically just do the same thing that happens when unloading the driver (on sleep), and similarly doing the same that happens when loading the driver (on wake). I was hoping that would be very simple to do, but if it requires doing most of the work I'd have to do for full power management support then I'll probably have to postpone it. I'll check out the references.

Thanks,
Jim
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References: 
 >Serial family IOkit questions (From: Peter Dufault <email@hidden>)
 >Re: Serial family IOkit questions (From: Garth Cummings <email@hidden>)
 >Re: Serial family IOkit questions (From: Peter Dufault <email@hidden>)
 >Unload driver on sleep? (From: Jim Wintermyre <email@hidden>)
 >Re: Unload driver on sleep? (From: Shawn Erickson <email@hidden>)



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