  dev_id         -
 .     
,   .    , 
       ,
,  ,       
  .    
   dev_id  NULL!

      , -
    ,    -
.       ,   -
     .  
    ,     
   ,      -
    .

 ,       -
,     .     
,     ,    -
,          .
  request_irq ()     SH_SHIRQ,   -
      ,      
         -
    SH_SHIRQ. ,     2.6, 
    ,  ""   -
     SA_INTERRUPT.

   ,      -
,    .  ,  
    ,    
 .    ,  
     .   ,  -
     (status register)   
,      .   
     .

  

    ,  
   RTC (real-time clock,   ), 
  drivers/char/rtc. .  RTC     -
,    (PC).     -
 ,      ,  
  (alarm)      
(periodic timer).        -
       ( ) -
(I/O range).        -
   .    
:  ,      .
    RTC   rtc_init ()  -

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