#10160 NORM 1.5-sof: expose the audio codec's "in use" state to user level

[Zarro Boogs per Child]

#10160: expose the audio codec's "in use" state to user level
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           Reporter:  pgf          |       Owner:  cjb                               
               Type:  enhancement  |      Status:  assigned                          
           Priority:  normal       |   Milestone:  1.5-software-update               
          Component:  kernel       |     Version:  Development source as of this date
         Resolution:               |    Keywords:                                    
        Next_action:  design       |    Verified:  0                                 
Deployment_affected:               |   Blockedby:                                    
           Blocking:               |  
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Comment(by pgf):

 maybe "time of last sample" would cover it?

 we also want to cover both output and input.

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Ticket URL: <http://dev.laptop.org/ticket/10160#comment:2>
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