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78 lines
2.0 KiB
78 lines
2.0 KiB
/* 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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