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-rw-r--r--drivers/iio/chemical/scd30.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/iio/chemical/scd30.h b/drivers/iio/chemical/scd30.h
new file mode 100644
index 0000000000..1ac9f3f792
--- /dev/null
+++ b/drivers/iio/chemical/scd30.h
@@ -0,0 +1,75 @@
+/* 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