Pismo: How to check if the lid is closed.

[Michael Schmitz]

> I found out from pmud's source code how to send it to sleep but I
> did not understand how to check if the lid is closed. I also had no
> luck searching for documentation about how to do it.

I think the lid state is encoded in the pmu data packets that pmud polls
for every second.

In poll_pmu():

	if (pmu_op(PMU_GET_COVER, 0, 0, &switches, 1, "switch req") < 0)
		return;

 	if ((switches & 1) != 0)
	{
	 	syslog(LOG_INFO, "lid closed: request sleep");
	 	chloralhydrate = 1;     /* lid is closed, go to sleep */
	}

So basically you need to send the PMU a specific request for information
(PMU_GET_COVER) and test bit 1 of the response byte.

> Does anyone have link to some documentation concerning that issue?

:-) This is Apple. The Darwin source might be your best bet. Or the pmud
source above, if you don't care about the meaning of the other bytes in
the PMU_GET_COVER response.

	Michael


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