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Re: Cancel Sleep

On Jan 1, 2008, at 10:38 PM, Andrew James wrote:
But seriously can we get back to the point!!!!

Some of us have been. I've pointed you at more appropriate mailing lists (darwin-kernel and darwin-drivers). I've outlined an overall strategy for interposing or overriding any kernel behavior that you don't like. I know these messages are getting through to the mailing list.

How does one get a notification of the lid state changing (When the lid closes, nothing to do with sleep) that does not also mix up with the power state changing,

One doesn't, without writing a kext to implement new kernel-level behavior, for the simple reason that no such notification currently exists.

As i've suggested twice now, write a kext that Interposes on (or even replaces) the existing kernel code (at a first guess, the PMU driver). You might not even have to patch running code--you might be able to get by just registering as the recipient for PMU interrupts (since the PMU is where the clamshell sensor is wired to), and queueing up a user-level notification yourself before passing along the interrupt to the system driver. But in any case, you'll have to dig into it at the IOKit driver level, since the system PMU driver is what sends the kIOPMSleepNow notification to the root domain in response to a "clamshell closed" interrupt. It also handles the power button, the AC power state change, etc. There is no notification of the clamshell state that is not "mixed up with the power state changing" for you to register for, so if you need one, you'll have to synthesize one yourself by watching the physical interrupt coming in from the hardware.

If you want to see how all this works in excruciating detail, see the OpenPMU driver (part of XPostFacto, which is open source). In particular, take a look at OpenPMUPwrController.cpp.

We can't get any closer to the "point" without actually writing the code for you.

--Amanda

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References: 
 >Re: Cancel Sleep (From: Michael Smith <email@hidden>)
 >Re: Cancel Sleep (From: David Elliott <email@hidden>)
 >Re: Cancel Sleep (From: Michael Smith <email@hidden>)
 >Re: Cancel Sleep (From: Marc Epard <email@hidden>)
 >Re: Cancel Sleep (From: Michael Smith <email@hidden>)
 >Re: Cancel Sleep (From: Andrew James <email@hidden>)



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