#9988 NORM 1.5-sof: XO-1.5 disk activity light doesn't work

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#9988: XO-1.5 disk activity light doesn't work
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           Reporter:  wad     |       Owner:  dsaxena                          
               Type:  defect  |      Status:  new                              
           Priority:  normal  |   Milestone:  1.5-software-later               
          Component:  kernel  |     Version:  Development build as of this date
         Resolution:          |    Keywords:                                   
        Next_action:  design  |    Verified:  0                                
Deployment_affected:          |   Blockedby:                                   
           Blocking:          |  
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Comment(by dsaxena):

 Looked into this and the kernel has an LED subsystem that can be used to
 hook this in. Like most kernel stuff, documentation is rather lacking but
 what I believe we need to do is:

 - Add a mmcblock LED trigger event (maybe we can piggyback on the existing
 IDE  disk trigger?)
 - Add a driver for the XO that ties into this trigger (There's an existing
 GPIO LED driver, might be able to hook into it..)

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Ticket URL: <http://dev.laptop.org/ticket/9988#comment:2>
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