/*
 * Copyright (c) 2018 Bosch Sensortec GmbH
 * Copyright (c) 2022, Leonard Pollak
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef __ZEPHYR_DRIVERS_SENSOR_BME680_H__
#define __ZEPHYR_DRIVERS_SENSOR_BME680_H__

#include <zephyr/types.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/drivers/i2c.h>

#define DT_DRV_COMPAT bosch_bme680

#define BME680_BUS_SPI DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
#define BME680_BUS_I2C DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c)

union bme680_bus {
#if BME680_BUS_SPI
	struct spi_dt_spec spi;
#endif
#if BME680_BUS_I2C
	struct i2c_dt_spec i2c;
#endif
};

typedef int (*bme680_bus_check_fn)(const union bme680_bus *bus);
typedef int (*bme680_reg_read_fn)(const struct device *dev,
				  uint8_t start, uint8_t *buf, int size);
typedef int (*bme680_reg_write_fn)(const struct device *dev,
				   uint8_t reg, uint8_t val);

struct bme680_bus_io {
	bme680_bus_check_fn check;
	bme680_reg_read_fn read;
	bme680_reg_write_fn write;
};

#if BME680_BUS_SPI
#define BME680_SPI_OPERATION (SPI_WORD_SET(8) | SPI_TRANSFER_MSB | SPI_MODE_CPOL \
		| SPI_MODE_CPHA | SPI_OP_MODE_MASTER)
extern const struct bme680_bus_io bme680_bus_io_spi;
#endif

#if BME680_BUS_I2C
extern const struct bme680_bus_io bme680_bus_io_i2c;
#endif

struct bme680_config {
	union bme680_bus bus;
	const struct bme680_bus_io *bus_io;
};

#define BME680_CHIP_ID                  0x61

#define BME680_LEN_FIELD                15
#define BME680_LEN_COEFF_ALL            42
#define BME680_LEN_COEFF1               23
#define BME680_LEN_COEFF2               14
#define BME680_LEN_COEFF3               5

#define BME680_REG_COEFF3               0x00
#define BME680_REG_FIELD0               0x1d
#define BME680_REG_IDAC_HEAT0           0x50
#define BME680_REG_RES_HEAT0            0x5A
#define BME680_REG_GAS_WAIT0            0x64
#define BME680_REG_SHD_HEATR_DUR        0x6E
#define BME680_REG_CTRL_GAS_0           0x70
#define BME680_REG_CTRL_GAS_1           0x71
#define BME680_REG_CTRL_HUM             0x72
#define BME680_REG_CTRL_MEAS            0x74
#define BME680_REG_CONFIG               0x75
#define BME680_REG_MEM_PAGE             0x73
#define BME680_REG_UNIQUE_ID            0x83
#define BME680_REG_COEFF1               0x8a
#define BME680_REG_COEFF2               0xe1
#define BME680_REG_CHIP_ID		0xd0
#define BME680_REG_SOFT_RESET           0xe0

#define BME680_MSK_NEW_DATA             0x80
#define BME680_MSK_GAS_RANGE            0x0f
#define BME680_MSK_RH_RANGE             0x30
#define BME680_MSK_RANGE_SW_ERR         0xf0
#define BME680_MSK_HEATR_STAB           0x10

#define BME680_SPI_READ_BIT		0x80
#define BME680_SPI_WRITE_MSK		0x7f

#define BME680_MEM_PAGE1		0x00
#define BME680_MEM_PAGE0		0x10

#if defined CONFIG_BME680_TEMP_OVER_1X
#define BME680_TEMP_OVER                (1 << 5)
#elif defined CONFIG_BME680_TEMP_OVER_2X
#define BME680_TEMP_OVER                (2 << 5)
#elif defined CONFIG_BME680_TEMP_OVER_4X
#define BME680_TEMP_OVER                (3 << 5)
#elif defined CONFIG_BME680_TEMP_OVER_8X
#define BME680_TEMP_OVER                (4 << 5)
#elif defined CONFIG_BME680_TEMP_OVER_16X
#define BME680_TEMP_OVER                (5 << 5)
#endif

#if defined CONFIG_BME680_PRESS_OVER_1X
#define BME680_PRESS_OVER               (1 << 2)
#elif defined CONFIG_BME680_PRESS_OVER_2X
#define BME680_PRESS_OVER               (2 << 2)
#elif defined CONFIG_BME680_PRESS_OVER_4X
#define BME680_PRESS_OVER               (3 << 2)
#elif defined CONFIG_BME680_PRESS_OVER_8X
#define BME680_PRESS_OVER               (4 << 2)
#elif defined CONFIG_BME680_PRESS_OVER_16X
#define BME680_PRESS_OVER               (5 << 2)
#endif

#if defined CONFIG_BME680_HUMIDITY_OVER_1X
#define BME680_HUMIDITY_OVER            1
#elif defined CONFIG_BME680_HUMIDITY_OVER_2X
#define BME680_HUMIDITY_OVER            2
#elif defined CONFIG_BME680_HUMIDITY_OVER_4X
#define BME680_HUMIDITY_OVER            3
#elif defined CONFIG_BME680_HUMIDITY_OVER_8X
#define BME680_HUMIDITY_OVER            4
#elif defined CONFIG_BME680_HUMIDITY_OVER_16X
#define BME680_HUMIDITY_OVER            5
#endif

#if defined CONFIG_BME680_HEATR_TEMP_LP
#define BME680_HEATR_TEMP                               320
#elif defined CONFIG_BME680_HEATR_TEMP_ULP
#define BME680_HEATR_TEMP                               400
#endif

#if defined CONFIG_BME680_HEATR_DUR_LP
#define BME680_HEATR_DUR_MS                             197
#elif defined CONFIG_BME680_HEATR_DUR_ULP
#define BME680_HEATR_DUR_MS                             1943
#endif

#if defined CONFIG_BME680_FILTER_OFF
#define BME680_FILTER                   0
#elif defined CONFIG_BME680_FILTER_2
#define BME680_FILTER                   (1 << 2)
#elif defined CONFIG_BME680_FILTER_4
#define BME680_FILTER                   (2 << 2)
#elif defined CONFIG_BME680_FILTER_8
#define BME680_FILTER                   (3 << 2)
#elif defined CONFIG_BME680_FILTER_16
#define BME680_FILTER                   (4 << 2)
#elif defined CONFIG_BME680_FILTER_32
#define BME680_FILTER                   (5 << 2)
#elif defined CONFIG_BME680_FILTER_64
#define BME680_FILTER                   (6 << 2)
#elif defined CONFIG_BME680_FILTER_128
#define BME680_FILTER                   (7 << 2)
#endif

#define BME680_MODE_SLEEP               0
#define BME680_MODE_FORCED              1

#define BME680_CTRL_MEAS_VAL    (BME680_PRESS_OVER | BME680_TEMP_OVER \
				 | BME680_MODE_FORCED)
#define BME680_CONFIG_VAL               BME680_FILTER
#define BME680_CTRL_GAS_1_VAL   0x10

#define BME680_CONCAT_BYTES(msb, lsb) (((uint16_t)msb << 8) | (uint16_t)lsb)

struct bme680_data {
	/* Compensation parameters. */
	uint16_t par_h1;
	uint16_t par_h2;
	int8_t par_h3;
	int8_t par_h4;
	int8_t par_h5;
	uint8_t par_h6;
	int8_t par_h7;
	int8_t par_gh1;
	int16_t par_gh2;
	int8_t par_gh3;
	uint16_t par_t1;
	int16_t par_t2;
	int8_t par_t3;
	uint16_t par_p1;
	int16_t par_p2;
	int8_t par_p3;
	int16_t par_p4;
	int16_t par_p5;
	int8_t par_p6;
	int8_t par_p7;
	int16_t par_p8;
	int16_t par_p9;
	uint8_t par_p10;
	uint8_t res_heat_range;
	int8_t res_heat_val;
	int8_t range_sw_err;

	/* Calculated sensor values. */
	int32_t calc_temp;
	uint32_t calc_press;
	uint32_t calc_humidity;
	uint32_t calc_gas_resistance;

	/* Additional information */
	uint8_t new_data;
	uint8_t heatr_stab;

	/* Carryover between temperature and pressure/humidity compensation. */
	int32_t t_fine;

	uint8_t chip_id;

#if BME680_BUS_SPI
	uint8_t mem_page;
#endif
};

#endif /* __ZEPHYR_DRIVERS_SENSOR_BME680_H__ */