/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _SCD30_H
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#define _SCD30_H
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/regulator/consumer.h>
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#include <linux/types.h>
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struct scd30_state;
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enum scd30_cmd {
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/* start continuous measurement with pressure compensation */
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CMD_START_MEAS,
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/* stop continuous measurement */
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CMD_STOP_MEAS,
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/* set/get measurement interval */
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CMD_MEAS_INTERVAL,
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/* check whether new measurement is ready */
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CMD_MEAS_READY,
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/* get measurement */
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CMD_READ_MEAS,
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/* turn on/off automatic self calibration */
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CMD_ASC,
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/* set/get forced recalibration value */
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CMD_FRC,
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/* set/get temperature offset */
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CMD_TEMP_OFFSET,
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/* get firmware version */
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CMD_FW_VERSION,
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/* reset sensor */
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CMD_RESET,
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/*
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* Command for altitude compensation was omitted intentionally because
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* the same can be achieved by means of CMD_START_MEAS which takes
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* pressure above the sea level as an argument.
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*/
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};
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#define SCD30_MEAS_COUNT 3
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typedef int (*scd30_command_t)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
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void *response, int size);
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struct scd30_state {
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/* serialize access to the device */
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struct mutex lock;
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struct device *dev;
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struct regulator *vdd;
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struct completion meas_ready;
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/*
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* priv pointer is solely for serdev driver private data. We keep it
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* here because driver_data inside dev has been already used for iio and
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* struct serdev_device doesn't have one.
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*/
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void *priv;
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int irq;
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/*
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* no way to retrieve current ambient pressure compensation value from
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* the sensor so keep one around
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*/
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u16 pressure_comp;
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u16 meas_interval;
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int meas[SCD30_MEAS_COUNT];
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scd30_command_t command;
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};
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int scd30_suspend(struct device *dev);
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int scd30_resume(struct device *dev);
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static __maybe_unused SIMPLE_DEV_PM_OPS(scd30_pm_ops, scd30_suspend, scd30_resume);
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int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command);
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#endif
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