Update hwmon fan target sysfs entries
Override the default FanSpeed.Target set implementation so when a target
value is written to the FanSpeed interface it is also updated in the
related fan target sysfs file. This sets a particular fan to the given
target speed.
Resolves openbmc/openbmc#962
Resolves openbmc/phosphor-hwmon#1
Change-Id: I867811737269b3f42d2a0dc15b37782a74f147b8
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/fan_speed.hpp b/fan_speed.hpp
new file mode 100644
index 0000000..7c7da3a
--- /dev/null
+++ b/fan_speed.hpp
@@ -0,0 +1,59 @@
+#pragma once
+
+#include "interface.hpp"
+
+namespace hwmon
+{
+
+/**
+ * @class FanSpeed
+ * @brief Target fan speed control implementation
+ * @details Derived FanSpeedObject type that writes the target value to sysfs
+ * which in turn sets the fan speed to that target value
+ */
+class FanSpeed : public FanSpeedObject
+{
+ public:
+
+ /**
+ * @brief Constructs FanSpeed Object
+ *
+ * @param[in] sysfsRoot - The hwmon class root
+ * @param[in] instance - The hwmon instance (ex. hwmon1)
+ * @param[in] id - The hwmon id
+ * @param[in] bus - Dbus bus object
+ * @param[in] objPath - Dbus object path
+ * @param[in] defer - Dbus object registration defer
+ */
+ FanSpeed(const std::string& sysfsRoot,
+ const std::string& instance,
+ const std::string& id,
+ sdbusplus::bus::bus& bus,
+ const char* objPath,
+ bool defer) : FanSpeedObject(bus, objPath, defer),
+ sysfsRoot(sysfsRoot),
+ instance(instance),
+ id(id)
+ {
+ // Nothing to do here
+ }
+
+ /**
+ * @brief Set the value of target
+ *
+ * @return Value of target
+ */
+ uint64_t target(uint64_t value) override;
+
+ private:
+ /** @brief hwmon class root */
+ std::string sysfsRoot;
+ /** @brief hwmon instance */
+ std::string instance;
+ /** @brief hwmon type */
+ static constexpr auto type = "fan";
+ /** @brief hwmon id */
+ std::string id;
+};
+
+} // namespace hwmon