1cfa6d918a
Organizes sensor drivers by vendor to distribute maintainership responsibilities. Signed-off-by: Maureen Helm <maureen.helm@analog.com>
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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* Copyright (c) 2023 Centralp
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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 nxp_tempmon
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/drivers/sensor.h>
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/* OTP Controller Analog Register 1 for calibration values */
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#define OCOTP_ANA1_ROOM_COUNT_SHIFT 20
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#define OCOTP_ANA1_ROOM_COUNT_MASK (BIT_MASK(12) << OCOTP_ANA1_ROOM_COUNT_SHIFT)
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#define OCOTP_ANA1_HOT_COUNT_SHIFT 8
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#define OCOTP_ANA1_HOT_COUNT_MASK (BIT_MASK(12) << OCOTP_ANA1_HOT_COUNT_SHIFT)
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#define OCOTP_ANA1_HOT_TEMP_SHIFT 0
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#define OCOTP_ANA1_HOT_TEMP_MASK (BIT_MASK(8) << OCOTP_ANA1_HOT_TEMP_SHIFT)
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#define TEMPMON_ROOM_TEMP 25.0f
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struct nxp_tempmon_data {
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uint8_t hot_temp;
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uint16_t hot_cnt;
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uint16_t room_cnt;
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uint16_t temp_cnt;
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};
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struct nxp_tempmon_config {
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TEMPMON_Type *base;
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};
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static int nxp_tempmon_sample_fetch(const struct device *dev, enum sensor_channel chan)
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{
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struct nxp_tempmon_data *data = dev->data;
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const struct nxp_tempmon_config *cfg = dev->config;
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if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_DIE_TEMP) {
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return -ENOTSUP;
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}
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/* Start the measure */
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cfg->base->TEMPSENSE0 |= TEMPMON_TEMPSENSE0_MEASURE_TEMP_MASK;
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/* Wait until measure is ready */
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while (!(cfg->base->TEMPSENSE0 & TEMPMON_TEMPSENSE0_FINISHED_MASK)) {
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}
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data->temp_cnt = (cfg->base->TEMPSENSE0 & TEMPMON_TEMPSENSE0_TEMP_CNT_MASK) >>
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TEMPMON_TEMPSENSE0_TEMP_CNT_SHIFT;
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/* Stop the measure */
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cfg->base->TEMPSENSE0 &= ~TEMPMON_TEMPSENSE0_MEASURE_TEMP_MASK;
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return 0;
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}
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static int nxp_tempmon_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 nxp_tempmon_data *data = dev->data;
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float temp;
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if (chan != SENSOR_CHAN_DIE_TEMP) {
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return -ENOTSUP;
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}
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temp = (float)data->hot_temp - ((float)data->temp_cnt - (float)data->hot_cnt) *
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(((float)data->hot_temp - TEMPMON_ROOM_TEMP) /
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((float)data->room_cnt - (float)data->hot_cnt));
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return sensor_value_from_double(val, temp);
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}
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static const struct sensor_driver_api nxp_tempmon_driver_api = {
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.sample_fetch = nxp_tempmon_sample_fetch,
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.channel_get = nxp_tempmon_channel_get,
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};
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static int nxp_tempmon_init(const struct device *dev)
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{
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struct nxp_tempmon_data *data = dev->data;
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const struct nxp_tempmon_config *cfg = dev->config;
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uint32_t ocotp_ana1;
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/* Enable the temperature sensor */
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cfg->base->TEMPSENSE0 &= ~TEMPMON_TEMPSENSE0_POWER_DOWN_MASK;
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/* Single measure with no repeat mode */
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cfg->base->TEMPSENSE1 = TEMPMON_TEMPSENSE1_MEASURE_FREQ(0);
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/* Read calibration data */
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ocotp_ana1 = OCOTP->ANA1;
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data->hot_temp = (ocotp_ana1 & OCOTP_ANA1_HOT_TEMP_MASK) >> OCOTP_ANA1_HOT_TEMP_SHIFT;
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data->hot_cnt = (ocotp_ana1 & OCOTP_ANA1_HOT_COUNT_MASK) >> OCOTP_ANA1_HOT_COUNT_SHIFT;
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data->room_cnt = (ocotp_ana1 & OCOTP_ANA1_ROOM_COUNT_MASK) >> OCOTP_ANA1_ROOM_COUNT_SHIFT;
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return 0;
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}
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static struct nxp_tempmon_data nxp_tempmon_dev_data = {
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.hot_temp = 0,
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.hot_cnt = 0,
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.room_cnt = 0,
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.temp_cnt = 0,
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};
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static const struct nxp_tempmon_config nxp_tempmon_dev_config = {
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.base = (TEMPMON_Type *)DT_INST_REG_ADDR(0),
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};
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SENSOR_DEVICE_DT_INST_DEFINE(0, nxp_tempmon_init, NULL, &nxp_tempmon_dev_data,
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&nxp_tempmon_dev_config, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
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&nxp_tempmon_driver_api);
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