blob: ae19030a5dc06fc6c94553580621f59dee550b99 [file] [log] [blame]
/*
* Copyright (c) 2019 Actinius
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT silabs_si7060
#include <zephyr/device.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/logging/log.h>
#include "si7060.h"
#define SIGN_BIT_MASK 0x7F
LOG_MODULE_REGISTER(si7060, CONFIG_SENSOR_LOG_LEVEL);
struct si7060_data {
uint16_t temperature;
};
struct si7060_config {
struct i2c_dt_spec i2c;
};
static int si7060_reg_read(const struct device *dev, uint8_t reg, uint8_t *val)
{
const struct si7060_config *config = dev->config;
if (i2c_reg_read_byte_dt(&config->i2c, reg, val)) {
return -EIO;
}
return 0;
}
static int si7060_reg_write(const struct device *dev, uint8_t reg, uint8_t val)
{
const struct si7060_config *config = dev->config;
return i2c_reg_write_byte_dt(&config->i2c, reg, val);
}
static int si7060_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
struct si7060_data *drv_data = dev->data;
if (si7060_reg_write(dev, SI7060_REG_CONFIG,
SI7060_ONE_BURST_VALUE) != 0) {
return -EIO;
}
int retval;
uint8_t dspsigm;
uint8_t dspsigl;
retval = si7060_reg_read(dev, SI7060_REG_TEMP_HIGH, &dspsigm);
retval += si7060_reg_read(dev, 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(const struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct si7060_data *drv_data = dev->data;
int32_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(const struct device *dev)
{
const struct si7060_config *config = dev->config;
uint8_t value;
if (!device_is_ready(config->i2c.bus)) {
LOG_ERR("Bus device is not ready");
return -ENODEV;
}
if (si7060_reg_read(dev, 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(const struct device *dev)
{
if (si7060_chip_init(dev) < 0) {
return -EINVAL;
}
return 0;
}
#define SI7060_DEFINE(inst) \
static struct si7060_data si7060_data_##inst; \
\
static const struct si7060_config si7060_config_##inst = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
}; \
\
SENSOR_DEVICE_DT_INST_DEFINE(inst, si7060_init, NULL, \
&si7060_data_##inst, &si7060_config_##inst, POST_KERNEL, \
CONFIG_SENSOR_INIT_PRIORITY, &si7060_api); \
DT_INST_FOREACH_STATUS_OKAY(SI7060_DEFINE)