linux-kernel - Re: [PATCH] hwmon: Add power meters to Documentation/hwmon/sysfs-interface

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Date:	Sat, 1 Sep 2007 14:05:03 -0400
From:	"Shem Multinymous" <multinymous@...il.com>
To:	"Pavel Machek" <pavel@....cz>
Cc:	"Darrick J. Wong" <djwong@...ibm.com>,
	"Jean Delvare" <khali@...ux-fr.org>,
	"Henrique de Moraes Holschuh" <hmh@....eng.br>,
	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH] hwmon: Add power meters to Documentation/hwmon/sysfs-interface

On 9/1/07, Pavel Machek <pavel@....cz> wrote:
> > diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
> > index b3a9e1b..da546ce 100644
> > --- a/Documentation/hwmon/sysfs-interface
> > +++ b/Documentation/hwmon/sysfs-interface
> > @@ -304,6 +304,21 @@ curr[1-*]_input  Current input value
> >               Unit: milliampere
> >               RO
> >
> > +*********
> > +* Power *
> > +*********
> > +
> > +power[1-*]_input     Current power use
> > +                     Unit: milliWatt
> > +                     RO
> > +
> > +power[1-*]_max_input Historical maximum power use
> > +                     Unit: milliWatt
> > +                     RO
> > +
> > +power[1-*]_min_input Historical minimum power use
> > +                     Unit: milliWatt
> > +                     RO
>
> Should we add power?_10sec_avg_input? IIRC thinkpads export that,
> too.

Indeed, ThinkPads report both instantaneous power/current and a
rolling average (exponentially decaying, I think) over the last ~10
seconds. ACPI provides only the rolling average, and the out-of-tree
tp_smapi driver provides both.

More generally, linux/power_supply.h defines these attributes:

	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,

It would be nice if the power meter interface uses the same
conventions as the power supply interface, since the former is
essentially a subset of the latter. Userspace app that read power
meters via sysfs should work for power supplies too.

  Shem
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