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hwmon: enhance the sysfs API for power meters

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Augment the documentation of the hwmon sysfs API to accomodate ACPI power
meters and the current desired behavior of power capping hardware drivers.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Darrick J. Wong 2009-10-26 16:50:07 -07:00 committed by Linus Torvalds
parent 46c529cf79
commit 115a57c5b3
1 changed files with 56 additions and 1 deletions
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57
Documentation/hwmon/sysfs-interface
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@ -353,10 +353,20 @@ power[1-*]_average Average power use
Unit: microWatt
RO
power[1-*]_average_interval Power use averaging interval
power[1-*]_average_interval Power use averaging interval. A poll
notification is sent to this file if the
hardware changes the averaging interval.
Unit: milliseconds
RW
power[1-*]_average_interval_max Maximum power use averaging interval
Unit: milliseconds
RO
power[1-*]_average_interval_min Minimum power use averaging interval
Unit: milliseconds
RO
power[1-*]_average_highest Historical average maximum power use
Unit: microWatt
RO
@ -365,6 +375,18 @@ power[1-*]_average_lowest Historical average minimum power use
Unit: microWatt
RO
power[1-*]_average_max A poll notification is sent to
power[1-*]_average when power use
rises above this value.
Unit: microWatt
RW
power[1-*]_average_min A poll notification is sent to
power[1-*]_average when power use
sinks below this value.
Unit: microWatt
RW
power[1-*]_input Instantaneous power use
Unit: microWatt
RO
@ -381,6 +403,39 @@ power[1-*]_reset_history Reset input_highest, input_lowest,
average_highest and average_lowest.
WO
power[1-*]_accuracy Accuracy of the power meter.
Unit: Percent
RO
power[1-*]_alarm 1 if the system is drawing more power than the
cap allows; 0 otherwise. A poll notification is
sent to this file when the power use exceeds the
cap. This file only appears if the cap is known
to be enforced by hardware.
RO
power[1-*]_cap If power use rises above this limit, the
system should take action to reduce power use.
A poll notification is sent to this file if the
cap is changed by the hardware. The *_cap
files only appear if the cap is known to be
enforced by hardware.
Unit: microWatt
RW
power[1-*]_cap_hyst Margin of hysteresis built around capping and
notification.
Unit: microWatt
RW
power[1-*]_cap_max Maximum cap that can be set.
Unit: microWatt
RO
power[1-*]_cap_min Minimum cap that can be set.
Unit: microWatt
RO
**********
* Energy *
**********