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NAME
       ata_dev_classify - determine device type based on ATA-spec signature


SYNOPSIS
       unsigned int ata_dev_classify  (const struct ata_taskfile * tf);


ARGUMENTS
       tf     ATA taskfile register set for device to be identified


DESCRIPTION
       Determine  from  taskfile  register contents whether a device is ATA or
       ATAPI, as per ‘‘Signature and  persistence’’  section  of  ATA/PI  spec
       (volume 1, sect 5.14).


LOCKING
       None.


RETURNS
       Device  type,  ATA_DEV_ATA, ATA_DEV_ATAPI, or ATA_DEV_UNKNOWN the event
       of failure.


AUTHOR
       Jeff Garzik.