eive-obsw/archive/gpio/gpioDefinitions.h

#ifndef LINUX_GPIO_GPIODEFINITIONS_H_
#define LINUX_GPIO_GPIODEFINITIONS_H_

#include <string>
#include <unordered_map>

using gpioId_t = uint16_t;

namespace gpio {

enum Levels { LOW = 0, HIGH = 1 };

enum Direction { IN = 0, OUT = 1 };

enum GpioOperation { READ, WRITE };

enum GpioTypes { NONE, GPIOD_REGULAR, CALLBACK };

static constexpr gpioId_t NO_GPIO = -1;
}  // namespace gpio

/**
 * @brief   Struct containing information about the GPIO to use. This is
 *          required by the libgpiod to access and drive a GPIO.
 * @param chipname      String of the chipname specifying the group which contains the GPIO to
 *                      access. E.g. gpiochip0. To detect names of GPIO groups run gpiodetect on
 *                      the linux command line.
 * @param lineNum       The offset of the GPIO within the GPIO group.
 * @param consumer      Name of the consumer. Simply a description of the GPIO configuration.
 * @param direction     Specifies whether the GPIO should be used as in- or output.
 * @param initValue     Defines the initial state of the GPIO when configured as output.
 *                      Only required for output GPIOs.
 * @param lineHandle    The handle returned by gpiod_chip_get_line will be later written to this
 *                      pointer.
 */
class GpioBase {
 public:
  GpioBase() = default;

  GpioBase(gpio::GpioTypes gpioType, std::string consumer, gpio::Direction direction, int initValue)
      : gpioType(gpioType), consumer(consumer), direction(direction), initValue(initValue) {}

  virtual ~GpioBase(){};

  /* Can be used to cast GpioBase to a concrete child implementation */
  gpio::GpioTypes gpioType = gpio::GpioTypes::NONE;
  std::string consumer;
  gpio::Direction direction = gpio::Direction::IN;
  int initValue = 0;
};

class GpiodRegular : public GpioBase {
 public:
  GpiodRegular()
      : GpioBase(gpio::GpioTypes::GPIOD_REGULAR, std::string(), gpio::Direction::IN, 0){};

  GpiodRegular(std::string chipname_, int lineNum_, std::string consumer_,
               gpio::Direction direction_, int initValue_)
      : GpioBase(gpio::GpioTypes::GPIOD_REGULAR, consumer_, direction_, initValue_),
        chipname(chipname_),
        lineNum(lineNum_) {}
  std::string chipname;
  int lineNum = 0;
  struct gpiod_line* lineHandle = nullptr;
};

class GpioCallback : public GpioBase {
 public:
  GpioCallback(std::string consumer, gpio::Direction direction_, int initValue_,
               void (*callback)(gpioId_t gpioId, gpio::GpioOperation gpioOp, int value, void* args),
               void* callbackArgs)
      : GpioBase(gpio::GpioTypes::CALLBACK, consumer, direction_, initValue_),
        callback(callback),
        callbackArgs(callbackArgs) {}

  void (*callback)(gpioId_t gpioId, gpio::GpioOperation gpioOp, int value, void* args) = nullptr;
  void* callbackArgs = nullptr;
};

using GpioMap = std::unordered_map<gpioId_t, GpioBase*>;
using GpioMapIter = GpioMap::iterator;

#endif /* LINUX_GPIO_GPIODEFINITIONS_H_ */