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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;
- };
- 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
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