#1420 BLOC Trial-2: Audio driver for AD1888 - power verification.

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#1420: Audio driver for AD1888 - power verification.
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  Reporter:  jg           |       Owner:  cjb    
      Type:  enhancement  |      Status:  new    
  Priority:  blocker      |   Milestone:  Trial-2
 Component:  kernel       |     Version:         
Resolution:               |    Keywords:  power  
  Verified:  0            |  
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Comment (by cjb):

 Replying to [comment:17 cjb]:
 > But we have a separate "analog input" mixer control that applications
 will toggle if they want to use analog in, so the above idea could work if
 we check the value of that control when deciding whether to turn on V_Ref
 as we start recording.  Might that work?

 This fails 'cause we might sometimes want to be in analog in but with
 V_Ref *on*.  One solution is to decouple the Analog In control from
 affecting other control and let applications that want to use Analog In
 set up the high-pass filter and V_Ref themselves.

 Once that's done, we can add:
   * if we're about to start [or stop] recording
     * if analog in is turned on, leave V_Ref alone
     * else turn V_Ref on [or off]

 Make sense?

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Ticket URL: <http://dev.laptop.org/ticket/1420#comment:18>
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