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/* 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;
};
int scd30_suspend(struct device *dev);
int scd30_resume(struct device *dev);
static __maybe_unused SIMPLE_DEV_PM_OPS(scd30_pm_ops, scd30_suspend, scd30_resume);
int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command);
#endif
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