On Maw, 2005-12-13 at 18:04 +0200, Shem Multinymous wrote:
> > What else does that code do, what else might it confuse, what rules and
> > locking are hidden in the windows driver that are unknown. Want to risk
> > everyones data for that ?
>
> We already take that risk to some degree, since the SMAPI BIOS is also
> invoked by the ACPI DSDT and by external events.
But the ACPI DSDT is OS independant in theory and in practice to a fair
extent. It can't make assumptions about windows drivers.
> > HDAPS doesn't need it btw.
>
> It's not implemented yet, but I gather it's necessary for preventing
> the disk from spinning back up as the laptop slides off the table.
> Maybe I missed some subsequent discussion?
HDAPS wants to be able to talk with the IDE/libata layer to request it
to hold off requests, thats very different to "gee I wonder what the
bios did"
> You write "command" values into IO ports 0x1610 and 0x161F and, in
> some cases, read some results from ports 0x1610-0x161F. Throughout
> that, you inspect various bits (whose meaning we don't understand) in
> the status port 0x1604. The details of the commands, scheduling and
> status bits differ between the drivers. I don't think a full-blown
> ownership and expansion infrastructure is necessary, or even possible
> without better understanding.
Ok
> Thanks for the pointers. I guess the minimal approach is probably
> ideal here; are there any such dumb drivers lying around?
Its probably easier to write than go find one
I mean you need
tp_hw_init() {
if (not a thinkpad) return -ENODEV
request_region(...)
return 0
}
tp_hw_exit() {
release_region(...)
}
EXPORT_SYMBOL_GPL(tp_hw_lock);
EXPORT_SYMBOL_GPL(tp_hw_unlock);
tp_hw_lock() {
down(&tp_sem);
}
tp_hw_unlock() {
up(&tp_sem);
}
/* And perhaps if the port varies by machine */
EXPORT_SYMBOL_GPL(tp_hw_addr);
tp_hw_addr() {
return 0x1600;
}
It can really be that simple
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