262 lines
6.3 KiB
C
262 lines
6.3 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <drivers/sensor.h>
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#include "sht3xd.h"
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#include <logging/log.h>
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LOG_MODULE_DECLARE(SHT3XD, CONFIG_SENSOR_LOG_LEVEL);
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static uint16_t sht3xd_temp_processed_to_raw(const struct sensor_value *val)
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{
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uint64_t uval;
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/* ret = (val + 45) * (2^16 - 1) / 175 */
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uval = (uint64_t)(val->val1 + 45) * 1000000U + val->val2;
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return ((uval * 0xFFFF) / 175) / 1000000;
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}
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static int sht3xd_rh_processed_to_raw(const struct sensor_value *val)
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{
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uint64_t uval;
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/* ret = val * (2^16 -1) / 100 */
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uval = (uint64_t)val->val1 * 1000000U + val->val2;
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return ((uval * 0xFFFF) / 100) / 1000000;
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}
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int sht3xd_attr_set(struct device *dev,
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enum sensor_channel chan,
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enum sensor_attribute attr,
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const struct sensor_value *val)
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{
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struct sht3xd_data *data = dev->driver_data;
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uint16_t set_cmd, clear_cmd, reg_val, temp, rh;
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if (attr == SENSOR_ATTR_LOWER_THRESH) {
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if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
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data->t_low = sht3xd_temp_processed_to_raw(val);
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} else if (chan == SENSOR_CHAN_HUMIDITY) {
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data->rh_low = sht3xd_rh_processed_to_raw(val);
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} else {
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return -ENOTSUP;
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}
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set_cmd = SHT3XD_CMD_WRITE_TH_LOW_SET;
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clear_cmd = SHT3XD_CMD_WRITE_TH_LOW_CLEAR;
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temp = data->t_low;
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rh = data->rh_low;
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} else if (attr == SENSOR_ATTR_UPPER_THRESH) {
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if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
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data->t_high = sht3xd_temp_processed_to_raw(val);
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} else if (chan == SENSOR_CHAN_HUMIDITY) {
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data->rh_high = sht3xd_rh_processed_to_raw(val);
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} else {
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return -ENOTSUP;
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}
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set_cmd = SHT3XD_CMD_WRITE_TH_HIGH_SET;
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clear_cmd = SHT3XD_CMD_WRITE_TH_HIGH_CLEAR;
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temp = data->t_high;
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rh = data->rh_high;
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} else {
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return -ENOTSUP;
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}
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reg_val = (rh & 0xFE00) | ((temp & 0xFF80) >> 7);
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if (sht3xd_write_reg(dev, set_cmd, reg_val) < 0 ||
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sht3xd_write_reg(dev, clear_cmd, reg_val) < 0) {
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LOG_DBG("Failed to write threshold value!");
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return -EIO;
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}
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return 0;
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}
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static inline void setup_alert(struct device *dev,
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bool enable)
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{
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struct sht3xd_data *data = (struct sht3xd_data *)dev->driver_data;
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const struct sht3xd_config *cfg =
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(const struct sht3xd_config *)dev->config_info;
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unsigned int flags = enable
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? GPIO_INT_EDGE_TO_ACTIVE
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: GPIO_INT_DISABLE;
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gpio_pin_interrupt_configure(data->alert_gpio, cfg->alert_pin, flags);
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}
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static inline void handle_alert(struct device *dev)
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{
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setup_alert(dev, false);
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#if defined(CONFIG_SHT3XD_TRIGGER_OWN_THREAD)
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struct sht3xd_data *data = (struct sht3xd_data *)dev->driver_data;
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k_sem_give(&data->gpio_sem);
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#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD)
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struct sht3xd_data *data = (struct sht3xd_data *)dev->driver_data;
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k_work_submit(&data->work);
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#endif
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}
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int sht3xd_trigger_set(struct device *dev,
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const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler)
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{
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struct sht3xd_data *data = (struct sht3xd_data *)dev->driver_data;
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const struct sht3xd_config *cfg =
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(const struct sht3xd_config *)dev->config_info;
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setup_alert(dev, false);
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if (trig->type != SENSOR_TRIG_THRESHOLD) {
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return -ENOTSUP;
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}
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data->handler = handler;
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if (handler == NULL) {
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return 0;
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}
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data->trigger = *trig;
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setup_alert(dev, true);
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/* If ALERT is active we probably won't get the rising edge,
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* so invoke the callback manually.
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*/
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if (gpio_pin_get(data->alert_gpio, cfg->alert_pin)) {
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handle_alert(dev);
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}
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return 0;
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}
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static void sht3xd_gpio_callback(struct device *dev,
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struct gpio_callback *cb, uint32_t pins)
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{
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struct sht3xd_data *data =
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CONTAINER_OF(cb, struct sht3xd_data, alert_cb);
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handle_alert(data->dev);
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}
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static void sht3xd_thread_cb(void *arg)
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{
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struct device *dev = (struct device *)arg;
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struct sht3xd_data *data = (struct sht3xd_data *)dev->driver_data;
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if (data->handler != NULL) {
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data->handler(dev, &data->trigger);
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}
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setup_alert(dev, true);
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}
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#ifdef CONFIG_SHT3XD_TRIGGER_OWN_THREAD
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static void sht3xd_thread(int dev_ptr, int unused)
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{
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struct device *dev = INT_TO_POINTER(dev_ptr);
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struct sht3xd_data *data = dev->driver_data;
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ARG_UNUSED(unused);
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while (1) {
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k_sem_take(&data->gpio_sem, K_FOREVER);
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sht3xd_thread_cb(dev);
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}
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}
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#endif
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#ifdef CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD
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static void sht3xd_work_cb(struct k_work *work)
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{
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struct sht3xd_data *data =
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CONTAINER_OF(work, struct sht3xd_data, work);
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sht3xd_thread_cb(data->dev);
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}
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#endif
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int sht3xd_init_interrupt(struct device *dev)
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{
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struct sht3xd_data *data = dev->driver_data;
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const struct sht3xd_config *cfg = dev->config_info;
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struct device *gpio = device_get_binding(cfg->alert_gpio_name);
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int rc;
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/* setup gpio interrupt */
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if (gpio == NULL) {
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LOG_DBG("Failed to get pointer to %s device!",
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cfg->alert_gpio_name);
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return -EINVAL;
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}
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data->alert_gpio = gpio;
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rc = gpio_pin_configure(gpio, cfg->alert_pin,
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GPIO_INPUT | cfg->alert_flags);
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if (rc != 0) {
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LOG_DBG("Failed to configure alert pin %u!", cfg->alert_pin);
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return -EIO;
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}
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gpio_init_callback(&data->alert_cb, sht3xd_gpio_callback,
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BIT(cfg->alert_pin));
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rc = gpio_add_callback(gpio, &data->alert_cb);
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if (rc < 0) {
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LOG_DBG("Failed to set gpio callback!");
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return -EIO;
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}
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/* set alert thresholds to match reamsurement ranges */
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data->t_low = 0U;
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data->rh_low = 0U;
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data->t_high = 0xFFFF;
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data->rh_high = 0xFFFF;
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if (sht3xd_write_reg(dev, SHT3XD_CMD_WRITE_TH_HIGH_SET, 0xFFFF)
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< 0) {
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LOG_DBG("Failed to write threshold high set value!");
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return -EIO;
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}
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if (sht3xd_write_reg(dev, SHT3XD_CMD_WRITE_TH_HIGH_CLEAR,
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0xFFFF) < 0) {
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LOG_DBG("Failed to write threshold high clear value!");
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return -EIO;
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}
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if (sht3xd_write_reg(dev, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
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LOG_DBG("Failed to write threshold low set value!");
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return -EIO;
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}
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if (sht3xd_write_reg(dev, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
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LOG_DBG("Failed to write threshold low clear value!");
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return -EIO;
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}
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#if defined(CONFIG_SHT3XD_TRIGGER_OWN_THREAD)
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k_sem_init(&data->gpio_sem, 0, UINT_MAX);
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k_thread_create(&data->thread, data->thread_stack,
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CONFIG_SHT3XD_THREAD_STACK_SIZE,
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(k_thread_entry_t)sht3xd_thread, dev,
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0, NULL, K_PRIO_COOP(CONFIG_SHT3XD_THREAD_PRIORITY),
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0, K_NO_WAIT);
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#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD)
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data->work.handler = sht3xd_work_cb;
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#endif
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return 0;
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}
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