c02e3aa47a
Organizes sensor drivers by vendor to distribute maintainership responsibilities. Signed-off-by: Maureen Helm <maureen.helm@analog.com>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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* Copyright (c) 2021 Teslabs Engineering S.L.
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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 maxim_max6675
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/drivers/spi.h>
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#include <zephyr/sys/byteorder.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(max6675, CONFIG_SENSOR_LOG_LEVEL);
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/** Thermocouple input bit (goes high if thermocouple is disconnected). */
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#define THERMOCOUPLE_INPUT BIT(2)
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/** Temperature position. */
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#define TEMPERATURE_POS 3U
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/** Temperature resolution (cDeg/LSB). */
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#define TEMPERATURE_RES 25U
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struct max6675_config {
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struct spi_dt_spec spi;
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};
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struct max6675_data {
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uint16_t sample;
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};
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static int max6675_sample_fetch(const struct device *dev,
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enum sensor_channel chan)
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{
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struct max6675_data *data = dev->data;
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const struct max6675_config *config = dev->config;
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int ret;
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uint8_t buf_rx[2];
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const struct spi_buf rx_buf = {
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.buf = buf_rx,
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.len = ARRAY_SIZE(buf_rx)
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};
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const struct spi_buf_set rx_bufs = {
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.buffers = &rx_buf,
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.count = 1U
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};
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if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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ret = spi_read_dt(&config->spi, &rx_bufs);
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if (ret < 0) {
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return ret;
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}
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data->sample = sys_get_be16(buf_rx);
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if (data->sample & THERMOCOUPLE_INPUT) {
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LOG_INF("Thermocouple not connected");
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return -ENOENT;
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}
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return 0;
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}
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static int max6675_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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struct max6675_data *data = dev->data;
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int32_t temperature;
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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temperature = (data->sample >> TEMPERATURE_POS) * TEMPERATURE_RES;
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val->val1 = temperature / 100;
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val->val2 = (temperature - val->val1 * 100) * 10000;
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return 0;
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}
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static const struct sensor_driver_api max6675_api = {
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.sample_fetch = &max6675_sample_fetch,
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.channel_get = &max6675_channel_get,
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};
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static int max6675_init(const struct device *dev)
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{
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const struct max6675_config *config = dev->config;
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if (!spi_is_ready_dt(&config->spi)) {
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LOG_ERR("SPI bus is not ready");
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return -ENODEV;
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}
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return 0;
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}
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#define MAX6675_INIT(n) \
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static struct max6675_data max6675_data_##n; \
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static const struct max6675_config max6675_config_##n = { \
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.spi = SPI_DT_SPEC_INST_GET(n, \
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SPI_OP_MODE_MASTER | \
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SPI_WORD_SET(8U), \
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0U), \
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}; \
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SENSOR_DEVICE_DT_INST_DEFINE(n, &max6675_init, NULL, \
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&max6675_data_##n, &max6675_config_##n, \
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POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, \
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&max6675_api);
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DT_INST_FOREACH_STATUS_OKAY(MAX6675_INIT)
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