tree ad9607a652f1d815d7ac955523879e2988f3b3e7
parent b89967ffa471f235ea3ab8608ddb6ed8ee687265
author Matt Spinler <spinler@us.ibm.com> 1616010738 -0500
committer Ed Tanous <ed@tanous.net> 1620658337 +0000

HwmonTempSensor: Thresholds for multi-temp devices

This commit adds support to be able to create the Threshold interfaces
for the additional temperature sensors on multi-sensor devices.
Previously, there could only be a threshold on the first sensor on
the device.  In some sensors, such as the TMP401 family, the remote
sensors which can be wired to other devices are the temp2+_input
values and it's likely those remote values are the interesting ones,
as opposed to just the local temp in temp1_input.

To specify thresholds for multiple sensors on the device, the 'Index'
property is added to the entity-manager JSON for the sensor.  When the
index is present, code matches that threshold entry with the sensor that
has an input file with that index number in the tempX prefix.  For
example, Index = 2 would be used for the sensor that has temp2_input as
the sensor value file.

Example JSON is:

    {
        "Index": 1 // This threshold is for the temp1_input sensor
        "Direction": "greater than",
        "Name": "upper critical",
        "Severity": 1,
        "Value": 70,
    },
    {
        "Index": 2 // This threshold is for the temp2_input sensor
        "Direction": "greater than",
        "Name": "upper critical",
        "Severity": 1,
        "Value": 80,
    }

If 'Index' is not present in the threshold data from entity-manager,
then just the first sensor will get the threshold, the same as before.

Tested:
Made sensors for a TMP423 which provides 4 temperature values.  Verified
thresholds showed up on each sensor when 'Index' was used.  Verified
when less then 4 thresholds were specified that they were placed
appropriately.  Also used just a single Threshold entry with no Index
value and verified the threshold just showed up on the first sensor.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: If787364761647088174cb72006727ee4e1d9225f