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#pragma once
#include <unistd.h>
#include <string>
#include <linux/input.h>
#include <systemd/sd-event.h>
#include <sdbusplus/bus.hpp>
#include "evdev.hpp"
namespace phosphor
{
namespace gpio
{
/** @class Monitor
* @brief Responsible for catching GPIO state change
* condition and starting systemd targets.
*/
class Monitor : public Evdev
{
public:
Monitor() = delete;
~Monitor() = default;
Monitor(const Monitor&) = delete;
Monitor& operator=(const Monitor&) = delete;
Monitor(Monitor&&) = delete;
Monitor& operator=(Monitor&&) = delete;
/** @brief Constructs Monitor object.
*
* @param[in] path - Path to gpio input device
* @param[in] key - GPIO key to monitor
* @param[in] polarity - GPIO assertion polarity to look for
* @param[in] target - systemd unit to be started on GPIO
* value change
* @param[in] event - sd_event handler
* @param[in] handler - IO callback handler. Defaults to one in this
* class
* @param[in] useEvDev - Whether to use EvDev to retrieve events
*/
Monitor(const std::string& path,
decltype(input_event::code) key,
decltype(input_event::value) polarity,
const std::string& target,
EventPtr& event,
sd_event_io_handler_t handler = Monitor::processEvents,
bool useEvDev = true)
: Evdev(path, key, event, handler, useEvDev),
polarity(polarity),
target(target) {};
/** @brief Callback handler when the FD has some activity on it
*
* @param[in] es - Populated event source
* @param[in] fd - Associated File descriptor
* @param[in] revents - Type of event
* @param[in] userData - User data that was passed during registration
*
* @return - 0 or positive number on success and negative
* errno otherwise
*/
static int processEvents(sd_event_source* es, int fd,
uint32_t revents, void* userData);
/** @brief Returns the completion state of this handler */
inline auto completed() const
{
return complete;
}
private:
/** @brief GPIO key value that is of interest */
decltype(input_event::value) polarity;
/** @brief Systemd unit to be started when the condition is met */
const std::string& target;
/** @brief Completion indicator */
bool complete = false;
/** @brief Analyzes the GPIO event and starts configured target */
void analyzeEvent();
};
} // namespace gpio
} // namespace phosphor
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