1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCD30_H
3#define _SCD30_H
4
5#include <linux/completion.h>
6#include <linux/device.h>
7#include <linux/mutex.h>
8#include <linux/pm.h>
9#include <linux/regulator/consumer.h>
10#include <linux/types.h>
11
12struct scd30_state;
13
14enum scd30_cmd {
15 /* start continuous measurement with pressure compensation */
16 CMD_START_MEAS,
17 /* stop continuous measurement */
18 CMD_STOP_MEAS,
19 /* set/get measurement interval */
20 CMD_MEAS_INTERVAL,
21 /* check whether new measurement is ready */
22 CMD_MEAS_READY,
23 /* get measurement */
24 CMD_READ_MEAS,
25 /* turn on/off automatic self calibration */
26 CMD_ASC,
27 /* set/get forced recalibration value */
28 CMD_FRC,
29 /* set/get temperature offset */
30 CMD_TEMP_OFFSET,
31 /* get firmware version */
32 CMD_FW_VERSION,
33 /* reset sensor */
34 CMD_RESET,
35 /*
36 * Command for altitude compensation was omitted intentionally because
37 * the same can be achieved by means of CMD_START_MEAS which takes
38 * pressure above the sea level as an argument.
39 */
40};
41
42#define SCD30_MEAS_COUNT 3
43
44typedef int (*scd30_command_t)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
45 void *response, int size);
46
47struct scd30_state {
48 /* serialize access to the device */
49 struct mutex lock;
50 struct device *dev;
51 struct regulator *vdd;
52 struct completion meas_ready;
53 /*
54 * priv pointer is solely for serdev driver private data. We keep it
55 * here because driver_data inside dev has been already used for iio and
56 * struct serdev_device doesn't have one.
57 */
58 void *priv;
59 int irq;
60 /*
61 * no way to retrieve current ambient pressure compensation value from
62 * the sensor so keep one around
63 */
64 u16 pressure_comp;
65 u16 meas_interval;
66 int meas[SCD30_MEAS_COUNT];
67
68 scd30_command_t command;
69};
70
71extern const struct dev_pm_ops scd30_pm_ops;
72
73int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command);
74
75#endif
76

source code of linux/drivers/iio/chemical/scd30.h