140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* Copyright (c) 2019 Peter Bigot Consulting, LLC
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* Copyright (c) 2016 Intel Corporation
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* Copyright (c) 2024 Vogl Electronic GmbH
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT jedec_jc_42_4_temp
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#include <errno.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/init.h>
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#include <zephyr/sys/byteorder.h>
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#include <zephyr/sys/__assert.h>
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#include <zephyr/logging/log.h>
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#include "jc42.h"
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LOG_MODULE_REGISTER(JC42, CONFIG_SENSOR_LOG_LEVEL);
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int jc42_reg_read(const struct device *dev, uint8_t reg, uint16_t *val)
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{
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const struct jc42_config *cfg = dev->config;
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int rc = i2c_write_read_dt(&cfg->i2c, ®, sizeof(reg), val, sizeof(*val));
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if (rc == 0) {
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*val = sys_be16_to_cpu(*val);
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}
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return rc;
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}
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int jc42_reg_write_16bit(const struct device *dev, uint8_t reg, uint16_t val)
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{
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const struct jc42_config *cfg = dev->config;
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uint8_t buf[3];
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buf[0] = reg;
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sys_put_be16(val, &buf[1]);
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return i2c_write_dt(&cfg->i2c, buf, sizeof(buf));
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}
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int jc42_reg_write_8bit(const struct device *dev, uint8_t reg, uint8_t val)
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{
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const struct jc42_config *cfg = dev->config;
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uint8_t buf[2] = {
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reg,
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val,
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};
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return i2c_write_dt(&cfg->i2c, buf, sizeof(buf));
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}
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static int jc42_set_temperature_resolution(const struct device *dev, uint8_t resolution)
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{
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return jc42_reg_write_8bit(dev, JC42_REG_RESOLUTION, resolution);
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}
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static int jc42_sample_fetch(const struct device *dev, enum sensor_channel chan)
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{
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struct jc42_data *data = dev->data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
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return jc42_reg_read(dev, JC42_REG_TEMP_AMB, &data->reg_val);
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}
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static int jc42_channel_get(const struct device *dev, enum sensor_channel chan,
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struct sensor_value *val)
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{
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const struct jc42_data *data = dev->data;
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int temp = jc42_temp_signed_from_reg(data->reg_val);
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP);
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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val->val1 = temp / JC42_TEMP_SCALE_CEL;
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temp -= val->val1 * JC42_TEMP_SCALE_CEL;
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val->val2 = (temp * 1000000) / JC42_TEMP_SCALE_CEL;
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return 0;
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}
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static const struct sensor_driver_api jc42_api_funcs = {
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.sample_fetch = jc42_sample_fetch,
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.channel_get = jc42_channel_get,
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#ifdef CONFIG_JC42_TRIGGER
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.attr_set = jc42_attr_set,
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.trigger_set = jc42_trigger_set,
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#endif /* CONFIG_JC42_TRIGGER */
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};
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int jc42_init(const struct device *dev)
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{
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const struct jc42_config *cfg = dev->config;
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int rc = 0;
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if (!device_is_ready(cfg->i2c.bus)) {
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LOG_ERR("Bus device is not ready");
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return -ENODEV;
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}
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rc = jc42_set_temperature_resolution(dev, cfg->resolution);
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if (rc) {
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LOG_ERR("Could not set the resolution of jc42 module");
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return rc;
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}
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#ifdef CONFIG_JC42_TRIGGER
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if (cfg->int_gpio.port) {
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rc = jc42_setup_interrupt(dev);
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}
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#endif /* CONFIG_JC42_TRIGGER */
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return rc;
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}
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#define JC42_DEFINE(inst) \
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static struct jc42_data jc42_data_##inst; \
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\
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static const struct jc42_config jc42_config_##inst = { \
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.i2c = I2C_DT_SPEC_INST_GET(inst), \
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.resolution = DT_INST_PROP(inst, resolution), \
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IF_ENABLED(CONFIG_JC42_TRIGGER, \
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(.int_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, int_gpios, {0}),))}; \
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\
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SENSOR_DEVICE_DT_INST_DEFINE(inst, jc42_init, NULL, &jc42_data_##inst, \
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&jc42_config_##inst, POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, &jc42_api_funcs);
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DT_INST_FOREACH_STATUS_OKAY(JC42_DEFINE)
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