DAC (digital->analog converter) in Jornada 6x0.

["Valeriy E. Ushakov" <uwe%ptc.spbu.ru@localhost>]

(For archival purposes mostly.  Or may be some kind volunteer has time
to add support for these.  Anyone? :)

SH7709 DAC in Jornada 680 seems to be wired like this:

channel 0 - screen brightness   higher values == dimmer
channel 1 - speaker volume

Speaker on/off is controlled via HD64461 GPIO, port A, bit 0.

a[0] = 0  - speaker on
a[0] = 1  - speaker off

SY, Uwe
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