/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SCD30_H
#define _SCD30_H

#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include <linux/types.h>

struct scd30_state;

enum scd30_cmd {
        /* start continuous measurement with pressure compensation */
        CMD_START_MEAS,
        /* stop continuous measurement */
        CMD_STOP_MEAS,
        /* set/get measurement interval */
        CMD_MEAS_INTERVAL,
        /* check whether new measurement is ready */
        CMD_MEAS_READY,
        /* get measurement */
        CMD_READ_MEAS,
        /* turn on/off automatic self calibration */
        CMD_ASC,
        /* set/get forced recalibration value */
        CMD_FRC,
        /* set/get temperature offset */
        CMD_TEMP_OFFSET,
        /* get firmware version */
        CMD_FW_VERSION,
        /* reset sensor */
        CMD_RESET,
        /*
         * Command for altitude compensation was omitted intentionally because
         * the same can be achieved by means of CMD_START_MEAS which takes
         * pressure above the sea level as an argument.
         */
};

#define SCD30_MEAS_COUNT 3

typedef int (*scd30_command_t)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
                               void *response, int size);

struct scd30_state {
        /* serialize access to the device */
        struct mutex lock;
        struct device *dev;
        struct regulator *vdd;
        struct completion meas_ready;
        /*
         * priv pointer is solely for serdev driver private data. We keep it
         * here because driver_data inside dev has been already used for iio and
         * struct serdev_device doesn't have one.
         */
        void *priv;
        int irq;
        /*
         * no way to retrieve current ambient pressure compensation value from
         * the sensor so keep one around
         */
        u16 pressure_comp;
        u16 meas_interval;
        int meas[SCD30_MEAS_COUNT];

        scd30_command_t command;
};

extern const struct dev_pm_ops scd30_pm_ops;

int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command);

#endif