On Thu, Oct 07, 2010 at 10:57:03PM -0300, Henrique de Moraes Holschuh wrote:
> On Fri, 08 Oct 2010, Martin Dengler wrote:
> > Perhaps a good start for me would be if anyone could point me to some
> > documentation on why "vdd" is useful in
> >
> > acpi_evalf(led_handle, NULL, NULL, "vdd",
> > led, led_led_arg1[ledstatus])
> >
> > from line 5103 in thinkpad_acpi.c[1]?
>
> Read the acpi_evalf() function code. It means void return, two integer
> parameters.
Sorry, not enough sleep - I was assuming "Positive supply voltage" or
something, but the code is quite straightforward, thanks.
> Usually, LED control uses bidimensional arrays, probably you need to
> mess with something else as well as with HLCL. Read the various LED
> methods in thinkpad-acpi to give you an idea. Read the DSDT and check
> if you can find how it sets LED states.
Thanks. I have stared at the thinkpad_acpi LED code a bit too much I
think :). All I can find in my DSDT looks simply like HLCL
manipulation:
Method (LED, 2, NotSerialized)
{
Or (Arg0, Arg1, Local0)
If (\_SB.PCI0.LPC0.ECON)
{
Store (Local0, HLCL)
}
Else
{
\WBEC (0x0C, Local0)
}
}
but maybe the WBEC AML gives me a hint:
SMI (0x00, 0x04, Arg0, Arg1, 0x00)
...but I don't know enough about AML to understand the significance of
".ECON" (and thus understand which branch of the LED method's "If" is
likely to be more interesting) :(.
Thanks for the pointers - plenty of reading for me.
Martin
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