tree e5e9164df2f0af62699be3e0b2dc912647102958
parent 358193811e9769851e7f04816c3f5938f5a64f64
author Matthew Barth <msbarth@us.ibm.com> 1524602005 -0500
committer Matthew Barth <msbarth@us.ibm.com> 1524859774 -0500

Fault status check before reading sensor value

Checking for the fault sysfs file should be done prior to reading the
input value when creating the sensor's dbus object. A sensor providing a
fault sysfs file will have a status interface functional property
created with its initial functional state. A sensor in a nonfunctional
state when the object is created, will have an initial value of 0.

The hwmon documentation states that when a sensor input channel presents
an associated fault file, the measurement value provided for that
channel should not be trusted when the fault boolean has a value of 1.
Using an initial value of 0 follows this specification and allows the
corresponding dbus object to be created.

Tested:
    Faulted sensor at hwmon start shows functional status of false.
    Faulted sensor at hwmon start contains a sensor value of 0.

Change-Id: I6388a3f84f638360b03e557aadc6de8331e67a69
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>