Add status interface to sensors

When a fault sysfs file is present for a sensor, the OperationalStatus
interface is attached to the sensor object. The functional property is
initially set to the corresponding value read from the fault sysfs file
when the sensor object is created. A follow-up commit will address
updating the functional property based on reading the fault sysfs file
during the polling interval.

Tested:
    OperationalStatus interface created for sensors with fault files
    Interface not created for sensors without fault file
    Functional property set to correct value from sensor's fault file

Change-Id: Id75b3711d048d4667d2173a3255512cf5482ab67
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/hwmon.hpp b/hwmon.hpp
index 5319b69..5a7a90f 100644
--- a/hwmon.hpp
+++ b/hwmon.hpp
@@ -13,11 +13,13 @@ static constexpr auto cinput = "input";
 static constexpr auto clabel = "label";
 static constexpr auto ctarget = "target";
 static constexpr auto cenable = "enable";
+static constexpr auto cfault = "fault";
 
 static const std::string input = cinput;
 static const std::string label = clabel;
 static const std::string target = ctarget;
 static const std::string enable = cenable;
+static const std::string fault = cfault;
 }
 
 namespace type