Card
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M-Audio Revolution 5.1
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PT2558 <---> Envy24GT ???
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PT2558 <---> Envy24GT I2C ???

PT2558 I2C Address = ???
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AK4358 <---> Envy24GT
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AK4358 CSN pin 19 <-> Envy24GT GPIO4 pin 56
AK4358 CCLK pin 20 <-> Envy24GT GPIO1 pin 51
AK4358 CDTI pin 21 <-> Envy24GT GPIO3 pin 53

CDTI: 2^3=0x08
CCLK: 2^1=0x02
CS: 2^4=0x10
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GPIO DIR, MASK, STATE
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100 0000 0000 0000 1111 1010	(GPIO DIR: 0x4000FA)
011 1111 1111 1111 1000 0101	(GPIO MASK: 0xBFFF85, 0x3FFF85)
000 0000 0000 0000 0111 0010	(GPIO STATE: 0x72)
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E2PROM
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SCFG:	0x42
ACL:	0x80
I2S:	0xf8
SPDIF:	0xc1
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