[Trac #1420] Audio driver for AD1888 - power verification.

[Zarro Boogs per Child]

#1420: Audio driver for AD1888 - power verification.
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 Reporter:  jg           |       Owner:  rsmith 
     Type:  enhancement  |      Status:  new    
 Priority:  normal       |   Milestone:  BTest-4
Component:  kernel       |    Keywords:  power  
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 The Analog Devices AD1888 can disable all sections of itself it is not
 using.  As it can drive 5.1 audio output, for example, it is important
 that we verify that all but the stereo channels are disabled.

 It also has a "deep sleep" feature, in which it can be entirely disabled.
 If its device driver is closed, the AD1888 should be put into deep sleep,
 and restored when the device opened.

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Ticket URL: <http://dev.laptop.org/ticket/1420>
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