Re: lm sensors sysfs file structure

Greg KH
2003-04-03T00:16:15Z

On Wed, Apr 02, 2003 at 12:27:47AM +0100, Dave Jones wrote:
> On Mon, Mar 31, 2003 at 10:44:39PM -0800, Greg KH wrote:
> > > Well, you had cV for PSU voltages and mV for cpu core voltage. I guess mV
> > > and mili-deg-C everywhere would be nicer.
> > As for why no floating point, it's a pain in the but to both output a
> > fixed point number from the kernel into floating point, and to parse a
> > floating point number from userspace within the kernel, turning it into
> > a fixed point number. With the proposal I wrote up, none of that is
> > needed, and all userspace has to do is divide by a factor of 10 to get
> > the proper value.
>
> FWIW, I'm taking the same fixed-point millivolt approach with the
> sysfs overrides for cpufreq. Having similar things in sysfs
> exporting the same units seems to be a good idea.

Hm, in looking around the kernel some more, it seems that there are a
number of other places that export voltage and temperature values (ACPI
being one of the most obvious.) It might be time to start thinking of a
single userspace library to access all of these kinds of values in a
system, instead of having to probe around different parts of the sysfs
tree by hand...

thanks,

greg k-h