IO Input based on DSDT

IO Input based on DSDT

[Matthew Tippett]

A quick question...

Based on the DSDT, is it possible to write userland applications that 
interrogate the same ports as the DSDT?  For example, the battery 
information method _BIF calls the BIF_ which is the following code.

Arg0 is the battery index.

         SX10()
         SX30(0x1)
         SX30(Arg0)
         SX11()
         Store(SX42(), Index(BIFP, 0x0, ))
         Store(SX42(), Index(BIFP, 0x1, ))
         Store(SX42(), Index(BIFP, 0x2, ))
         Store(SX42(), Index(BIFP, 0x3, ))
         Store(SX42(), Index(BIFP, 0x4, ))
         Store(SX42(), Index(BIFP, 0x5, ))
         Store(SX42(), Index(BIFP, 0x6, ))
         Store(SX42(), Index(BIFP, 0x7, ))
         Store(SX42(), Index(BIFP, 0x8, ))
         Store(SX45(), Index(BIFP, 0x9, ))
         Store(SX45(), Index(BIFP, 0xa, ))
         Store(SX45(), Index(BIFP, 0xb, ))
         Store(SX45(), Index(BIFP, 0xc, ))
         SX12()
         Return(BIFP)

Which is fairly obviously a 'configure', 'read', 'set structure',
'return'.

The question I have is that by digging deep enough into the call graph 
will I end up with a set of ports that would allow me to extract the 
data that I want, so that I can then rebuild a working DSDT.

And by extension, could I take some actions that occur on ports, and 
then look at making those available via ACPI?  (Such as fan control 
which is ignored in the Dell i8200 DSDT).

Regards,

Matt

-- 
Matthew Tippett - matthew.tippett-rieW9WUcm8FFJ04o6PK0Fg@public.gmane.org - (416) 435-4118
Technology Forum - http://www.technology-forum.org/
Commercial Open Source - http://www.commercialos.org/


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