fan_speed.hpp

#pragma once

#include <memory>

#include "hwmonio.hpp"
#include "interface.hpp"
#include "sysfs.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] io -  HwmonIO(instance path) (ex /sys/class/hwmon/hwmon1)
         * @param[in] devPath - The /sys/devices sysfs path
         * @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
         * @param[in] target - initial target speed value
         */
        FanSpeed(std::unique_ptr<hwmonio::HwmonIOInterface> io,
                 const std::string& devPath,
                 const std::string& id,
                 sdbusplus::bus::bus& bus,
                 const char* objPath,
                 bool defer,
                 uint64_t target) : FanSpeedObject(bus, objPath, defer),
                    id(id),
                    ioAccess(std::move(io)),
                    devPath(devPath)
        {
            FanSpeedObject::target(target);
        }

        /**
         * @brief Set the value of target
         *
         * @return Value of target
         */
        uint64_t target(uint64_t value) override;

        /**
         * @brief Writes the pwm_enable sysfs entry if the
         *        env var with the value to write is present
         */
        void enable();

    private:
        /** @brief hwmon type */
        static constexpr auto type = "fan";
        /** @brief hwmon id */
        std::string id;
        /** @brief Hwmon sysfs access. */
        std::unique_ptr<hwmonio::HwmonIOInterface> ioAccess;
        /** @brief Physical device path. */
        std::string devPath;

};

} // namespace hwmon