[Trac #679] potentially wake up for telephone like ring alert

[Zarro Boogs per Child]

#679: potentially wake up for telephone like ring alert
-------------------------+--------------------------------------------------
 Reporter:  jpritikin    |        Owner:  rchokshi
     Type:  enhancement  |       Status:  new     
 Priority:  normal       |    Milestone:  BTest-3 
Component:  wireless     |   Resolution:          
 Keywords:               |  
-------------------------+--------------------------------------------------
Comment (by JordanCrouse):

 Replying to [comment:8 rchokshi]:

 > - When the wireless module is awake and it receives a packet of a
 particular type (someone would need to define this type), it will send an
 event to the Libertas WLAN driver.
 > - The driver can then choose to "pull" the firmware out of power save
 mode and then indicate to the appropriate application to receive the
 incoming call, etc.
 >
 > Comment?

 In this scenario, the processor will be off, so the driver won't be
 available.  We could implement something similar to what you're talking
 about with wake on USB, but that has several drawbacks - namely that wake
 on USB works poorly under Linux to begin with, and it forces us to leave
 the USB clocks on, which is something we would rather not do if we can
 avoid it.  It also means that we'll have a bit of latency before the
 driver is able to communicate again, so if the wireless is expecting a
 timely response, it might be disappointed.

 A better solution is to have the wireless communicate with the EC via a
 GPIO pin, and have the EC wake the system via an SCI event - that is much
 easier for us to set up and its much more foolproof when it comes to
 waking the system and getting it in a sane state.

-- 
Ticket URL: <http://dev.laptop.org/ticket/679#comment:9>
One Laptop Per Child <http://laptop.org/>