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archive/gpio/LinuxLibgpioIF.h

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+#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_ */