sensors: Add max31785 MSL checking package

The phosphor-hwmon project recently added a script for setting the MSL
(Minimum Ship Level) on an inventory item given specific MAX31785
firmware revision criteria.  Add a package for this script.

The package is not installed by default - machine implementations
must pick it up themselves and configure when it runs and the script
parameters (inventory items, i2c address, revision...) accordingly.

Change-Id: I71aa589ad86b913d5a0637955817046b9d8de15f
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-phosphor/sensors/phosphor-hwmon.bb b/common/recipes-phosphor/sensors/phosphor-hwmon.bb
index 5acfe96..4af7581 100644
--- a/common/recipes-phosphor/sensors/phosphor-hwmon.bb
+++ b/common/recipes-phosphor/sensors/phosphor-hwmon.bb
@@ -7,7 +7,11 @@
 
 inherit autotools pkgconfig obmc-phosphor-systemd
 
+PACKAGE_BEFORE_PN = "max31785-msl"
+SYSTEMD_PACKAGES = "${PN} max31785-msl"
+
 SYSTEMD_SERVICE_${PN} = "xyz.openbmc_project.Hwmon@.service"
+SYSTEMD_SERVICE_max31785-msl = "phosphor-max31785-msl@.service"
 
 DEPENDS += "autoconf-archive-native"
 DEPENDS += " \
@@ -25,6 +29,9 @@
 
 RRECOMMENDS_${PN} += "${VIRTUAL-RUNTIME_phosphor-hwmon-config}"
 
+FILES_max31785-msl = "${bindir}/max31785-msl"
+RDEPENDS_max31785-msl = "${VIRTUAL-RUNTIME_base-utils} i2c-tools"
+
 SRC_URI += "git://github.com/openbmc/phosphor-hwmon"
 SRC_URI += "file://70-hwmon.rules"
 SRC_URI += "file://70-iio.rules"
diff --git a/common/recipes-phosphor/sensors/phosphor-hwmon/phosphor-max31785-msl@.service b/common/recipes-phosphor/sensors/phosphor-hwmon/phosphor-max31785-msl@.service
new file mode 100644
index 0000000..1bfda83
--- /dev/null
+++ b/common/recipes-phosphor/sensors/phosphor-hwmon/phosphor-max31785-msl@.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Phosphor MAX31785 MSL
+ConditionFileNotEmpty={envfiledir}/obmc/hwmon-max31785/%I.conf
+Wants=mapper-wait@-xyz-openbmc_project-inventory.service
+After=mapper-wait@-xyz-openbmc_project-inventory.service
+
+[Service]
+Type=oneshot
+ExecStart={bindir}/max31785-msl -p "${{PATHS}}" -b ${{BUS}} -r ${{REVISION}}
+EnvironmentFile={envfiledir}/obmc/hwmon-max31785/%I.conf