Re: Acer Aspire One fan control

[Peter Feuerer <peter@piie.net>]

Matthew Garrett writes:

> That depends on how you're doing it. Is the code available somewhere? 

Just cleaned up the code and released it on my homepage, you can download 
it from: http://piie.net/files/acerhdf_kmod-0.2.tar.gz

> If 
> these io ports are also used by the firmware then you'll need to find 
> ACPI methods to call to perform the fan control. 

I get the temperature by calling ec_read(0x58) and can read/write the state 
of the fan by ec_write to / ec_read from 0x55. Actually I don't know if 
those embedded controller registers are used by the firmware. How can I find 
it out?

> If there aren't any 
> then it's not safe to have a driver to do this.

I think there should not be a problem when calling ec_write and ec_read 
from my kernel module, as those functions are atomic. Or am I wrong?

--peter