[Trac #555] Add PM event for battery status change

[Zarro Boogs per Child]

#555: Add PM event for battery status change
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 Reporter:  krstic       |        Owner:  David.Lin
     Type:  enhancement  |       Status:  assigned 
 Priority:  normal       |    Milestone:  BTest-3  
Component:  hardware     |   Resolution:           
 Keywords:               |  
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Comment (by David.Lin):

 I haven't done this interface because I need to know your need.
 Richard sent mail about "Additional EC commands". I am going to write the
 code as Richard's suggestion. I need about two weeks to finish. If you
 have any suggestion let me know.

 ''Additional Commands:

 - % Battery capacity remaining.
 - Status (Battery present, not present, AC present, AC Not present, Type
 (LiFe, NiMH)
 - Bat Temp
 - Ambient Temp
 - Voltage
 - Current
 - Game button status (For dropping to OFW interactive mode.)

 New Features:
 - SCI interrupt on power status change. (AC plug/unplug)
 - SCI when battery capacity changes some x%.  How much % do we want that
 to be?
 - SCI at alarm points?''

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:9>
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