drivers: sensor: add F75303 temperature sensor driver

drivers/sensor/CMakeLists.txt

@@ -32,6 +32,7 @@ add_subdirectory_ifdef(CONFIG_DPS310 dps310)
 add_subdirectory_ifdef(CONFIG_DS18B20 ds18b20)
 add_subdirectory_ifdef(CONFIG_ENS210 ens210)
 add_subdirectory_ifdef(CONFIG_ESP32_TEMP esp32_temp)
+add_subdirectory_ifdef(CONFIG_F75303 f75303)
 add_subdirectory_ifdef(CONFIG_FDC2X1X fdc2x1x)
 add_subdirectory_ifdef(CONFIG_FXAS21002 fxas21002)
 add_subdirectory_ifdef(CONFIG_FXOS8700 fxos8700)

drivers/sensor/Kconfig

@@ -88,6 +88,7 @@ source "drivers/sensor/dps310/Kconfig"
 source "drivers/sensor/ds18b20/Kconfig"
 source "drivers/sensor/ens210/Kconfig"
 source "drivers/sensor/esp32_temp/Kconfig"
+source "drivers/sensor/f75303/Kconfig"
 source "drivers/sensor/fdc2x1x/Kconfig"
 source "drivers/sensor/fxas21002/Kconfig"
 source "drivers/sensor/fxos8700/Kconfig"

drivers/sensor/f75303/CMakeLists.txt

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+zephyr_library_sources(f75303.c)
+zephyr_library_sources_ifdef(CONFIG_EMUL_F75303 f75303_emul.c)

drivers/sensor/f75303/Kconfig

@@ -0,0 +1,22 @@
+# F75303 temperature sensor configuration options
+
+# Copyright (c) 2023 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+config F75303
+	bool "F75303 Temperature Sensor"
+	default y
+	depends on DT_HAS_FINTEK_F75303_ENABLED
+	select I2C
+	help
+	  Enable the driver for Fintek F75303 Temperature Sensor.
+	  This device has three temperature channels - one local (on-chip),
+	  and two remote.
+
+config EMUL_F75303
+	bool "Emulator for F75303"
+	default y
+	depends on F75303
+	depends on EMUL
+	help
+	  Enable the hardware emulator for F75303 Temperature Sensor.

drivers/sensor/f75303/f75303.c

@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2023 Google LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT fintek_f75303
+
+#include <zephyr/device.h>
+#include <zephyr/drivers/i2c.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/pm/device.h>
+#include <zephyr/pm/device_runtime.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/drivers/sensor/f75303.h>
+#include "f75303.h"
+
+#define F75303_SAMPLE_INT_SHIFT 3
+#define F75303_SAMPLE_FRAC_MASK GENMASK(2, 0)
+#define F75303_SAMPLE_MICROCELSIUS_PER_BIT 125000
+
+LOG_MODULE_REGISTER(F75303, CONFIG_SENSOR_LOG_LEVEL);
+
+static int f75303_fetch(const struct i2c_dt_spec *i2c,
+			uint8_t off_h, uint8_t off_l, uint16_t *sample)
+{
+	uint8_t val_h;
+	uint8_t val_l;
+	int res;
+
+	res = i2c_reg_read_byte_dt(i2c, off_h, &val_h);
+	if (res) {
+		return res;
+	}
+
+	res = i2c_reg_read_byte_dt(i2c, off_l, &val_l);
+	if (res) {
+		return res;
+	}
+
+	*sample = val_h << 3 | val_l >> 5;
+
+	return 0;
+}
+
+static int f75303_fetch_local(const struct device *dev)
+{
+	struct f75303_data *data = dev->data;
+	const struct f75303_config *config = dev->config;
+
+	return f75303_fetch(&config->i2c,
+			    F75303_LOCAL_TEMP_H,
+			    F75303_LOCAL_TEMP_L,
+			    &data->sample_local);
+}
+
+static int f75303_fetch_remote1(const struct device *dev)
+{
+	struct f75303_data *data = dev->data;
+	const struct f75303_config *config = dev->config;
+
+	return f75303_fetch(&config->i2c,
+			    F75303_REMOTE1_TEMP_H,
+			    F75303_REMOTE1_TEMP_L,
+			    &data->sample_remote1);
+}
+
+static int f75303_fetch_remote2(const struct device *dev)
+{
+	struct f75303_data *data = dev->data;
+	const struct f75303_config *config = dev->config;
+
+	return f75303_fetch(&config->i2c,
+			    F75303_REMOTE2_TEMP_H,
+			    F75303_REMOTE2_TEMP_L,
+			    &data->sample_remote2);
+}
+
+static int f75303_sample_fetch(const struct device *dev,
+			       enum sensor_channel chan)
+{
+	enum pm_device_state pm_state;
+	int res;
+
+	(void)pm_device_state_get(dev, &pm_state);
+	if (pm_state != PM_DEVICE_STATE_ACTIVE) {
+		return -EIO;
+	}
+
+	switch ((uint32_t)chan) {
+	case SENSOR_CHAN_ALL:
+		res = f75303_fetch_local(dev);
+		if (res) {
+			break;
+		}
+		res = f75303_fetch_remote1(dev);
+		if (res) {
+			break;
+		}
+		res = f75303_fetch_remote2(dev);
+		break;
+	case SENSOR_CHAN_AMBIENT_TEMP:
+		return f75303_fetch_local(dev);
+	case SENSOR_CHAN_F75303_REMOTE1:
+		return f75303_fetch_remote1(dev);
+	case SENSOR_CHAN_F75303_REMOTE2:
+		return f75303_fetch_remote2(dev);
+	default:
+		return -ENOTSUP;
+	}
+
+	return res;
+}
+
+static int f75303_channel_get(const struct device *dev,
+			      enum sensor_channel chan,
+			      struct sensor_value *val)
+{
+	struct f75303_data *data = dev->data;
+	uint16_t sample;
+
+	switch ((uint32_t)chan) {
+	case SENSOR_CHAN_AMBIENT_TEMP:
+		sample = data->sample_local;
+		break;
+	case SENSOR_CHAN_F75303_REMOTE1:
+		sample = data->sample_remote1;
+		break;
+	case SENSOR_CHAN_F75303_REMOTE2:
+		sample = data->sample_remote2;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+
+	/*
+	 * The reading is given in steps of 0.125 degrees celsius, i.e. the
+	 * temperature in degrees celsius is equal to sample / 8.
+	 */
+	val->val1 = sample >> F75303_SAMPLE_INT_SHIFT;
+	val->val2 = (sample & F75303_SAMPLE_FRAC_MASK) * F75303_SAMPLE_MICROCELSIUS_PER_BIT;
+
+	return 0;
+}
+
+static const struct sensor_driver_api f75303_driver_api = {
+	.sample_fetch = f75303_sample_fetch,
+	.channel_get = f75303_channel_get,
+};
+
+static int f75303_init(const struct device *dev)
+{
+	const struct f75303_config *config = dev->config;
+	int res = 0;
+
+	if (!i2c_is_ready_dt(&config->i2c)) {
+		LOG_ERR("I2C device not ready");
+		return -ENODEV;
+	}
+
+#ifdef CONFIG_PM_DEVICE_RUNTIME
+	pm_device_init_suspended(dev);
+
+	res = pm_device_runtime_enable(dev);
+	if (res) {
+		LOG_ERR("Failed to enable runtime power management");
+	}
+#endif
+
+	return res;
+}
+
+#ifdef CONFIG_PM_DEVICE
+static int f75303_pm_action(const struct device *dev, enum pm_device_action action)
+{
+	switch (action) {
+	case PM_DEVICE_ACTION_TURN_ON:
+	case PM_DEVICE_ACTION_RESUME:
+	case PM_DEVICE_ACTION_TURN_OFF:
+	case PM_DEVICE_ACTION_SUSPEND:
+		return 0;
+	default:
+		return -ENOTSUP;
+	}
+}
+#endif
+
+#define F75303_INST(inst)								\
+	static struct f75303_data f75303_data_##inst;					\
+	static const struct f75303_config f75303_config_##inst = {			\
+		.i2c = I2C_DT_SPEC_INST_GET(inst),					\
+	};										\
+	PM_DEVICE_DT_INST_DEFINE(inst, f75303_pm_action);				\
+	SENSOR_DEVICE_DT_INST_DEFINE(inst, f75303_init, PM_DEVICE_DT_INST_GET(inst),	\
+			      &f75303_data_##inst, &f75303_config_##inst, POST_KERNEL,	\
+			      CONFIG_SENSOR_INIT_PRIORITY, &f75303_driver_api);
+
+DT_INST_FOREACH_STATUS_OKAY(F75303_INST)

drivers/sensor/f75303/f75303.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023 Google LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_DRIVERS_SENSOR_F75303_F75303_H_
+#define ZEPHYR_DRIVERS_SENSOR_F75303_F75303_H_
+
+#include <zephyr/device.h>
+#include <zephyr/sys/util.h>
+
+#define F75303_LOCAL_TEMP_H	0x00
+#define F75303_REMOTE1_TEMP_H	0x01
+#define F75303_REMOTE1_TEMP_L	0x10
+#define F75303_REMOTE2_TEMP_H	0x23
+#define F75303_REMOTE2_TEMP_L	0x24
+#define F75303_LOCAL_TEMP_L	0x29
+
+struct f75303_data {
+	uint16_t sample_local;
+	uint16_t sample_remote1;
+	uint16_t sample_remote2;
+};
+
+struct f75303_config {
+	struct i2c_dt_spec i2c;
+};
+
+#endif