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/**
 * @file bmp280_spi.cpp
 *
 * SPI interface for BMP280
 */

#include "bmp280.h"

#include <px4_platform_common/px4_config.h>
#include <drivers/device/spi.h>

/* SPI protocol address bits */
#define DIR_READ			(1<<7)  //for set
#define DIR_WRITE			~(1<<7) //for clear

#pragma pack(push,1)
struct spi_data_s {
	uint8_t addr;
	struct bmp280::data_s data;
};

struct spi_calibration_s {
	uint8_t addr;
	struct bmp280::calibration_s cal;
};
#pragma pack(pop)

class BMP280_SPI: public device::SPI, public bmp280::IBMP280
{
public:
	BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode);
	virtual ~BMP280_SPI() override = default;

	int init() override { return SPI::init(); }

	uint8_t	get_reg(uint8_t addr) override;
	int	set_reg(uint8_t value, uint8_t addr) override;

	bmp280::data_s		*get_data(uint8_t addr) override;
	bmp280::calibration_s	*get_calibration(uint8_t addr) override;

	uint32_t get_device_id() const override { return device::SPI::get_device_id(); }

	uint8_t get_device_address() const override { return device::SPI::get_device_address(); }
private:
	spi_calibration_s	_cal{};
	spi_data_s		_data{};
};

bmp280::IBMP280 *
bmp280_spi_interface(uint8_t busnum, uint32_t device, int bus_frequency, spi_mode_e spi_mode)
{
	return new BMP280_SPI(busnum, device, bus_frequency, spi_mode);
}

BMP280_SPI::BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode) :
	SPI("BMP280_SPI", nullptr, bus, device, spi_mode, bus_frequency)
{
}

uint8_t
BMP280_SPI::get_reg(uint8_t addr)
{
	uint8_t cmd[2] = { (uint8_t)(addr | DIR_READ), 0}; // set MSB bit
	transfer(&cmd[0], &cmd[0], 2);

	return cmd[1];
}

int
BMP280_SPI::set_reg(uint8_t value, uint8_t addr)
{
	uint8_t cmd[2] = { (uint8_t)(addr & DIR_WRITE), value}; // clear MSB bit
	return transfer(&cmd[0], nullptr, 2);
}

bmp280::data_s *
BMP280_SPI::get_data(uint8_t addr)
{
	_data.addr = (uint8_t)(addr | DIR_READ); // set MSB bit

	if (transfer((uint8_t *)&_data, (uint8_t *)&_data, sizeof(spi_data_s)) == OK) {
		return &(_data.data);

	} else {
		return nullptr;
	}
}

bmp280::calibration_s *
BMP280_SPI::get_calibration(uint8_t addr)
{
	_cal.addr = addr | DIR_READ;

	if (transfer((uint8_t *)&_cal, (uint8_t *)&_cal, sizeof(spi_calibration_s)) == OK) {
		return &(_cal.cal);

	} else {
		return nullptr;
	}
}