eive-obsw/archive/gpio/LinuxLibgpioIF.h
Robin Mueller b71ea7c4c7
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C++

#ifndef LINUX_GPIO_LINUXLIBGPIOIF_H_
#define LINUX_GPIO_LINUXLIBGPIOIF_H_
#include <fsfw/objectmanager/SystemObject.h>
#include <fsfwconfig/returnvalues/classIds.h>
#include <linux/gpio/GpioIF.h>
class GpioCookie;
/**
* @brief This class implements the GpioIF for a linux based system. The
* implementation is based on the libgpiod lib which requires linux 4.8
* or higher.
* @note The Petalinux SDK from Xilinx supports libgpiod since Petalinux
* 2019.1.
*/
class LinuxLibgpioIF : public GpioIF, public SystemObject {
public:
static const uint8_t gpioRetvalId = CLASS_ID::LINUX_LIBGPIO_IF;
static constexpr ReturnValue_t UNKNOWN_GPIO_ID =
HasReturnvaluesIF::makeReturnCode(gpioRetvalId, 1);
static constexpr ReturnValue_t DRIVE_GPIO_FAILURE =
HasReturnvaluesIF::makeReturnCode(gpioRetvalId, 2);
static constexpr ReturnValue_t GPIO_TYPE_FAILURE =
HasReturnvaluesIF::makeReturnCode(gpioRetvalId, 3);
static constexpr ReturnValue_t GPIO_INVALID_INSTANCE =
HasReturnvaluesIF::makeReturnCode(gpioRetvalId, 4);
LinuxLibgpioIF(object_id_t objectId);
virtual ~LinuxLibgpioIF();
ReturnValue_t addGpios(GpioCookie* gpioCookie) override;
ReturnValue_t pullHigh(gpioId_t gpioId) override;
ReturnValue_t pullLow(gpioId_t gpioId) override;
ReturnValue_t readGpio(gpioId_t gpioId, int* gpioState) override;
private:
/* Holds the information and configuration of all used GPIOs */
GpioMap gpioMap;
GpioMapIter gpioMapIter;
/**
* @brief This functions drives line of a GPIO specified by the GPIO ID.
*
* @param gpioId The GPIO ID of the GPIO to drive.
* @param logiclevel The logic level to set. O or 1.
*/
ReturnValue_t driveGpio(gpioId_t gpioId, GpiodRegularBase& regularGpio, unsigned int logiclevel);
ReturnValue_t configureRegularGpio(gpioId_t gpioId, GpiodRegularBase& regularGpio);
/**
* @brief This function checks if GPIOs are already registered and whether
* there exists a conflict in the GPIO configuration. E.g. the
* direction.
*
* @param mapToAdd The GPIOs which shall be added to the gpioMap.
*
* @return RETURN_OK if successful, otherwise RETURN_FAILED
*/
ReturnValue_t checkForConflicts(GpioMap& mapToAdd);
ReturnValue_t checkForConflictsRegularGpio(gpioId_t gpiodId, GpiodRegular* regularGpio,
GpioMap& mapToAdd);
ReturnValue_t checkForConflictsCallbackGpio(gpioId_t gpiodId, GpioCallback* regularGpio,
GpioMap& mapToAdd);
/**
* @brief Performs the initial configuration of all GPIOs specified in the GpioMap mapToAdd.
*/
ReturnValue_t configureGpios(GpioMap& mapToAdd);
};
#endif /* LINUX_GPIO_LINUXLIBGPIOIF_H_ */