Supplementary or Alternatively, all of the ATA device commands issued by hdparm
can be supported in a driver by simply implementing the HDIO_DRIVE_CMD
ioctl -- This is only a few lines of code in a typical SATA/SCSI driver,
and I could easily supply a patch to implement it in libata.

Sure it's old, looks clunky, but it is simple code that works
and is used by many more tools than just hdparm today.

Cheers
-- 
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")

Mark Lord wrote:

hdparm works for some SCSI devices already, and support for
more is already on the way.  I imagine I can have it handle
whatever new ioctls() are being provided from libata as well.

Care to point me at them?

Thanks