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standard for return codes in device drivers

Hi all,

Are there standards for function return codes inside the kernel?
e.g.
   -1 : unsuccessful
    0 : successful
    1 : set some status word/variable
    .
    .

Is it left to the whims of the device driver writer?

Regards,
Amit
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                  Amit Kucheria
          EECS Grad. Research Assistant
         University of Kansas @ Lawrence
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