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 12 struct scd30_state; 13 14 enum 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 44 typedef int (*scd30_command_t)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg, 45 void *response, int size); 46 47 struct 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 71 extern const struct dev_pm_ops scd30_pm_ops; 72 73 int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command); 74 75 #endif 76