linux-kernel - Adding critical/fault limits to hwmon sysfs API

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Message-ID: <20100620163759.GA7077@ericsson.com>
Date:	Sun, 20 Jun 2010 09:37:59 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	lm-sensors@...sensors.org
CC:	linux-kernel@...r.kernel.org
Subject: Adding critical/fault limits to hwmon sysfs API

Hi,

the current hwmon sysfs API does not specify critical or fault limits for voltage
and current readings.

Many recent power controller/monitoring chips have support for such limits in addition
to alarm limits. Typical action, when a the critical or fault limit is reached,
may be a board reset or power shutdown, or to report the fault condition.

Examples for chips supporting critical/fault limits are SMM665 and variants as well
as many PMBus devices, such as MAX8688, MAX16064, LTC2978, and others.

I think it would make sense to add critical/fault limits to the hwmon sysfs API,
to be able to report those limits if supported by a chip.

Any thoughts on this ?

Thanks,
Guenter

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