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#pragma once
#include <sdbusplus/bus.hpp>
#include <sdbusplus/server.hpp>
#include "sensor_base.hpp"
namespace phosphor
{
namespace fan
{
namespace presence
{
/**
* @class TachSensor
* @brief OpenBMC Tach feedback sensor presence implementation
* @details Derived sensor type that uses the tach feedback value to determine
* the presence of the fan enclosure that contains this sensor
*/
class TachSensor : public Sensor
{
public:
TachSensor() = delete;
TachSensor(const TachSensor&) = delete;
TachSensor(TachSensor&&) = delete;
TachSensor& operator=(const TachSensor&) = delete;
TachSensor& operator=(TachSensor&&) = delete;
~TachSensor() = default;
/**
* @brief Constructs Tach Sensor Object
*
* @param[in] bus - Dbus bus object
* @param[in] id - ID name of this sensor
* @param[in] fanEnc - Reference to the fan enclosure with this sensor
*/
TachSensor(
sdbusplus::bus::bus& bus,
const std::string& id,
FanEnclosure& fanEnc) :
Sensor(id, fanEnc),
bus(bus),
tachSignal(bus,
match(id).c_str(),
handleTachChangeSignal,
this)
{
// Nothing to do here
}
/**
* @brief Determine the presence of this sensor using the tach feedback
*
* @return Presence state based on tach feedback
*/
bool isPresent();
private:
/** @brief Connection for sdbusplus bus */
sdbusplus::bus::bus& bus;
/** @brief Used to subscribe to dbus signals */
sdbusplus::server::match::match tachSignal;
/** @brief Tach speed value given from the signal */
int64_t tach = 0;
/**
* @brief Appends the fan sensor id to construct a match string
*
* @param[in] id - Fan sensor id
*
* @return Match string to register signal for the fan sensor id
*/
static std::string match(const std::string& id)
{
return std::string("type='signal',"
"interface='org.freedesktop.DBus.Properties',"
"member='PropertiesChanged',"
"path='/xyz/openbmc_project/sensors/fan_tach/" +
id + "'");
}
/**
* @brief Callback function on tach change signals
*
* @param[out] msg - Data associated with the subscribed signal
* @param[out] data - Pointer to this tach sensor object instance
* @param[out] err - Contains any sdbus error reference if occurred
*
* @return 0
*/
static int handleTachChangeSignal(sd_bus_message* msg,
void* data,
sd_bus_error* err);
/**
* @brief Determine & handle when the signal was a tach change
*
* @param[in] msg - Expanded sdbusplus message data
* @param[in] err - Contains any sdbus error reference if occurred
*/
void handleTachChange(sdbusplus::message::message& msg,
sd_bus_error* err);
};
} // namespace presence
} // namespace fan
} // namespace phosphor
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