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#pragma once
#include <sdeventplus/source/io.hpp>
#include <optional>
#include "evdevpp/evdev.hpp"
#include "psensor.hpp"
#include "utility.hpp"
namespace phosphor
{
namespace fan
{
namespace presence
{
class RedundancyPolicy;
/**
* @class Gpio
* @brief Gpio presence sensor implementation.
*
* The Gpio class uses a gpio wire to determine presence state.
*/
class Gpio : public PresenceSensor
{
public:
/**
* @brief
*
* Cannot move or copy due to this ptr as context
* for sdevent callbacks.
*/
Gpio() = delete;
Gpio(const Gpio&) = delete;
Gpio& operator=(const Gpio&) = delete;
Gpio(Gpio&&) = delete;
Gpio& operator=(Gpio&&) = delete;
~Gpio() = default;
/**
* @brief Construct a gpio sensor.
*
* @param[in] physDevice - The physical gpio device path.
* @param[in] device - The gpio-keys input device.
* @param[in] physPin - The physical gpio pin number.
*/
Gpio(
const std::string& physDevice,
const std::string& device,
unsigned int physPin);
/**
* @brief start
*
* Register for an sdevent io callback on the gpio.
* Query the initial state of the gpio.
*
* @return The current sensor state.
*/
bool start() override;
/**
* @brief stop
*
* De-register sdevent io callback.
*/
void stop() override;
/**
* @brief fail
*
* Call the gpio out.
*/
void fail() override;
/**
* @brief Check the sensor.
*
* Query the gpio.
*/
bool present() override;
private :
/** @brief Get the policy associated with this sensor. */
virtual RedundancyPolicy& getPolicy() = 0;
/** @brief sdevent io callback. */
void ioCallback();
/** The current state of the sensor. */
bool currentState;
/** Gpio event device file descriptor. */
util::FileDescriptor evdevfd;
/** Gpio event device. */
evdevpp::evdev::EvDev evdev;
/** Physical gpio device. */
std::string phys;
/** Gpio pin number. */
unsigned int pin;
/** sdevent io handle. */
std::optional<sdeventplus::source::IO> source;
};
} // namespace presence
} // namespace fan
} // namespace phosphor
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