drivers: sensor: Add SI7060 temperature sensor driver

Add SI7060 temperature sensor driver

Signed-off-by: Iosif Macesanu <iosif@actinius.com>

drivers/sensor/CMakeLists.txt

@@ -50,6 +50,7 @@ add_subdirectory_ifdef(CONFIG_QDEC_NRFX		qdec_nrfx)
 add_subdirectory_ifdef(CONFIG_TEMP_NRF5		nrf5)
 add_subdirectory_ifdef(CONFIG_SHT3XD		sht3xd)
 add_subdirectory_ifdef(CONFIG_SI7006		si7006)
+add_subdirectory_ifdef(CONFIG_SI7060		si7060)
 add_subdirectory_ifdef(CONFIG_STTS751		stts751)
 add_subdirectory_ifdef(CONFIG_SX9500		sx9500)
 add_subdirectory_ifdef(CONFIG_TH02		    th02)

drivers/sensor/Kconfig

@@ -125,6 +125,8 @@ source "drivers/sensor/sht3xd/Kconfig"
 
 source "drivers/sensor/si7006/Kconfig"
 
+source "drivers/sensor/si7060/Kconfig"
+
 source "drivers/sensor/stts751/Kconfig"
 
 source "drivers/sensor/sx9500/Kconfig"

drivers/sensor/si7060/CMakeLists.txt

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_library_sources_ifdef(CONFIG_SI7060 si7060.c)

drivers/sensor/si7060/Kconfig

@@ -0,0 +1,12 @@
+# Kconfig - SI7060 temperature sensor configuration options #
+#
+# Copyright (c) 2019 Actinius
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menuconfig SI7060
+	bool "SI7060 Temperature Sensor"
+	depends on (I2C && HAS_DTS_I2C)
+	help
+	  Enable driver for SI7060 temperature sensors.

drivers/sensor/si7060/si7060.c

@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2019 Actinius
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <device.h>
+#include <drivers/i2c.h>
+#include <drivers/sensor.h>
+#include <logging/log.h>
+
+#include "si7060.h"
+
+#define SIGN_BIT_MASK 0x7F
+
+LOG_MODULE_REGISTER(si7060, CONFIG_SENSOR_LOG_LEVEL);
+
+struct si7060_data {
+	struct device *i2c_dev;
+	u16_t temperature;
+};
+
+static int si7060_reg_read(struct si7060_data *drv_data, u8_t reg,
+			     u8_t *val)
+{
+	if (i2c_reg_read_byte(drv_data->i2c_dev,
+		DT_INST_0_SILABS_SI7060_BASE_ADDRESS, reg, val)) {
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int si7060_reg_write(struct si7060_data *drv_data, u8_t reg,
+			      u8_t val)
+{
+	return i2c_reg_write_byte(drv_data->i2c_dev,
+		DT_INST_0_SILABS_SI7060_BASE_ADDRESS, reg, val);
+}
+
+static int si7060_sample_fetch(struct device *dev, enum sensor_channel chan)
+{
+	struct si7060_data *drv_data = dev->driver_data;
+
+	if (si7060_reg_write(drv_data, SI7060_REG_CONFIG,
+		SI7060_ONE_BURST_VALUE) != 0) {
+		return -EIO;
+	}
+
+	int retval;
+	u8_t dspsigm;
+	u8_t dspsigl;
+
+	retval = si7060_reg_read(drv_data, SI7060_REG_TEMP_HIGH,
+		&dspsigm);
+	retval += si7060_reg_read(drv_data, SI7060_REG_TEMP_LOW,
+		&dspsigl);
+
+	if (retval == 0) {
+		drv_data->temperature = (256 * (dspsigm & SIGN_BIT_MASK))
+		+ dspsigl;
+	} else {
+		LOG_ERR("Read register err");
+	}
+
+	LOG_DBG("Sample_fetch retval: %d", retval);
+
+	return retval;
+}
+
+static int si7060_channel_get(struct device *dev, enum sensor_channel chan,
+			      struct sensor_value *val)
+{
+	struct si7060_data *drv_data = dev->driver_data;
+	s32_t uval;
+
+	if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
+		uval = ((55 * 160) + (drv_data->temperature - 16384)) >> 4;
+		val->val1 = uval / 10;
+		val->val2 = (uval % 10) * 100000;
+
+		LOG_DBG("Temperature = val1:%d, val2:%d", val->val1, val->val2);
+
+		return 0;
+	} else {
+		return -ENOTSUP;
+	}
+}
+
+static const struct sensor_driver_api si7060_api = {
+	.sample_fetch = &si7060_sample_fetch,
+	.channel_get = &si7060_channel_get,
+};
+
+static int si7060_chip_init(struct device *dev)
+{
+	struct si7060_data *drv_data = dev->driver_data;
+	u8_t value;
+
+	drv_data->i2c_dev = device_get_binding(
+		DT_INST_0_SILABS_SI7060_BUS_NAME);
+
+	if (!drv_data->i2c_dev) {
+		LOG_ERR("Failed to get pointer to %s device!",
+			DT_INST_0_SILABS_SI7060_BUS_NAME);
+		return -EINVAL;
+	}
+
+	if (si7060_reg_read(drv_data, SI7060_REG_CHIP_INFO,
+		&value) != 0) {
+		return -EIO;
+	}
+
+	if ((value >> 4) != SI7060_CHIP_ID_VALUE) {
+		LOG_ERR("Bad chip id 0x%x", value);
+		return -ENOTSUP;
+	}
+
+	return 0;
+}
+
+static int si7060_init(struct device *dev)
+{
+	if (si7060_chip_init(dev) < 0) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct si7060_data si_data;
+
+DEVICE_AND_API_INIT(si7060, DT_INST_0_SILABS_SI7060_LABEL, si7060_init,
+	&si_data, NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, &si7060_api);

drivers/sensor/si7060/si7060.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2019 Actinius
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef _SI7060_H
+#define _SI7060_H
+
+/* Si7060 register addresses */
+#define SI7060_REG_CHIP_INFO 0xC0
+#define SI7060_REG_TEMP_HIGH 0xC1
+#define SI7060_REG_TEMP_LOW 0xC2
+#define SI7060_REG_CONFIG 0xC4
+
+#define SI7060_CHIP_ID_VALUE 0x01
+#define SI7060_ONE_BURST_VALUE 0x04
+
+#endif /* _SI7060_H */

dts/bindings/sensor/silabs,si7060.yaml

@@ -0,0 +1,11 @@
+# Copyright (c) 2019, Actinius
+# SPDX-License-Identifier: Apache-2.0
+
+title: Si7060 Temperature sensor
+
+description: >
+    This is a representation of Si7060 Temperature sensor
+
+compatible: "silabs,si7060"
+
+include: i2c-device.yaml

tests/drivers/build_all/dts_fixup.h

@@ -180,6 +180,12 @@
 #define DT_INST_0_SILABS_SI7006_BUS_NAME	""
 #endif
 
+#ifndef DT_INST_0_SILABS_SI7060_LABEL
+#define DT_INST_0_SILABS_SI7060_LABEL ""
+#define DT_INST_0_SILABS_SI7060_BASE_ADDRESS 0x00
+#define DT_INST_0_SILABS_SI7060_BUS_NAME	""
+#endif
+
 #ifndef DT_INST_0_ST_LIS2DS12_LABEL
 #define DT_INST_0_ST_LIS2DS12_LABEL ""
 #define DT_INST_0_ST_LIS2DS12_BUS_NAME ""

tests/drivers/build_all/sensors_i_z.conf

@@ -26,6 +26,7 @@ CONFIG_MCP9808=y
 CONFIG_MPU6050=y
 CONFIG_SHT3XD=y
 CONFIG_SI7006=y
+CONFIG_SI7060=y
 CONFIG_SX9500=y
 CONFIG_TEMP_NRF5=y
 CONFIG_TH02=y