Questions regarding the wakeup interrupt

Holger Freyther zecke at
Wed Mar 26 22:15:36 CET 2008


I have started to look into suspend and resume and wonder how the modem wake 
up is supposed to work in the big plot.

Current State:
	- Enable the modem, enter pin, register with network
	- Enable unsolicited messages (signal strength, registration...)
	- echo "mem" > /sys/power/state at any point in time

	=> the device will wake up shortly afterwards due the modem wakeup interrupt.

What I would like to know:
	- How is the modem wakeup pin supposed to work (what makes the modem do the 
interrupt, what happens in regard to flow control)?
	- Should the GSM stack disable unsolicited messages before going to sleep?
	- This would require the GSM stack to know about suspend/resume, so the 
command queue could be frozen, the last commit submitted, unsolicited 
messages disabled... but we do not want to go this way.

	- How to make the modem wakeup pin usable?

	- The modem would wake us up on incoming call and SMS
	- It will return the last command result (or ERROR)
	- It will send the USC for the SMS or call.

enlightenment is highly appreciated

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