248 lines
6.4 KiB
C
248 lines
6.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <device.h>
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#include <misc/util.h>
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#include <nanokernel.h>
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#include <sensor.h>
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#include "sensor_sht3xd.h"
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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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uint32_t val2;
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uint64_t uval;
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if (val->type == SENSOR_VALUE_TYPE_INT) {
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val2 = 0;
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} else {
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val2 = val->val2;
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}
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/* ret = (val + 45) * (2^16 - 1) / 175 */
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uval = (uint64_t)(val->val1 + 45) * 1000000 + 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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uint32_t val2;
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uint64_t uval;
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if (val->type == SENSOR_VALUE_TYPE_INT) {
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val2 = 0;
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} else {
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val2 = val->val2;
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}
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/* ret = val * (2^16 -1) / 100000 */
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uval = (uint64_t)val->val1 * 1000000 + val2;
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return ((uval * 0xFFFF) / 100000) / 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 *drv_data = dev->driver_data;
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uint16_t set_cmd, clear_cmd, reg_val, temp, rh;
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if (val->type != SENSOR_VALUE_TYPE_INT &&
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val->type != SENSOR_VALUE_TYPE_INT_PLUS_MICRO) {
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return -ENOTSUP;
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}
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if (attr == SENSOR_ATTR_LOWER_THRESH) {
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if (chan == SENSOR_CHAN_TEMP) {
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drv_data->t_low = sht3xd_temp_processed_to_raw(val);
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} else if (chan == SENSOR_CHAN_HUMIDITY) {
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drv_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 = drv_data->t_low;
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rh = drv_data->rh_low;
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} else if (attr == SENSOR_ATTR_UPPER_THRESH) {
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if (chan == SENSOR_CHAN_TEMP) {
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drv_data->t_high = sht3xd_temp_processed_to_raw(val);
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} else if (chan == SENSOR_CHAN_HUMIDITY) {
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drv_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 = drv_data->t_high;
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rh = drv_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(drv_data, set_cmd, reg_val) < 0 ||
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sht3xd_write_reg(drv_data, clear_cmd, reg_val) < 0) {
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SYS_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 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 *drv_data =
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CONTAINER_OF(cb, struct sht3xd_data, gpio_cb);
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ARG_UNUSED(pins);
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gpio_pin_disable_callback(dev, CONFIG_SHT3XD_GPIO_PIN_NUM);
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#if defined(CONFIG_SHT3XD_TRIGGER_OWN_FIBER)
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nano_sem_give(&drv_data->gpio_sem);
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#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_FIBER)
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nano_work_submit(&drv_data->work);
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#endif
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}
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static void sht3xd_fiber_cb(void *arg)
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{
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struct device *dev = arg;
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struct sht3xd_data *drv_data = dev->driver_data;
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if (drv_data->handler != NULL) {
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drv_data->handler(dev, &drv_data->trigger);
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}
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gpio_pin_enable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
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}
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#ifdef CONFIG_SHT3XD_TRIGGER_OWN_FIBER
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static void sht3xd_fiber(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 *drv_data = dev->driver_data;
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ARG_UNUSED(unused);
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while (1) {
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nano_fiber_sem_take(&drv_data->gpio_sem, TICKS_UNLIMITED);
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sht3xd_fiber_cb(dev);
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}
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}
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#endif
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#ifdef CONFIG_SHT3XD_TRIGGER_GLOBAL_FIBER
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static void sht3xd_work_cb(struct nano_work *work)
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{
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struct sht3xd_data *drv_data =
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CONTAINER_OF(work, struct sht3xd_data, work);
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sht3xd_fiber_cb(drv_data->dev);
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}
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#endif
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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 *drv_data = dev->driver_data;
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if (trig->type != SENSOR_TRIG_THRESHOLD) {
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return -ENOTSUP;
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}
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gpio_pin_disable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
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drv_data->handler = handler;
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drv_data->trigger = *trig;
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gpio_pin_enable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
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return 0;
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}
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int sht3xd_init_interrupt(struct device *dev)
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{
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struct sht3xd_data *drv_data = dev->driver_data;
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drv_data->t_low = 0;
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drv_data->rh_low = 0;
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drv_data->t_high = 0xFFFF;
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drv_data->rh_high = 0xFFFF;
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/* set alert thresholds to match reamsurement ranges */
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if (sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_SET, 0xFFFF)
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< 0) {
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SYS_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(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_CLEAR,
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0xFFFF) < 0) {
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SYS_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(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
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SYS_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(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
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SYS_LOG_DBG("Failed to write threshold low clear value!");
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return -EIO;
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}
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/* setup gpio interrupt */
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drv_data->gpio = device_get_binding(CONFIG_SHT3XD_GPIO_DEV_NAME);
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if (drv_data->gpio == NULL) {
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SYS_LOG_DBG("Failed to get pointer to %s device!",
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CONFIG_SHT3XD_GPIO_DEV_NAME);
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return -EINVAL;
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}
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gpio_pin_configure(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM,
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GPIO_DIR_IN | GPIO_INT | GPIO_INT_LEVEL |
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GPIO_INT_ACTIVE_HIGH | GPIO_INT_DEBOUNCE);
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gpio_init_callback(&drv_data->gpio_cb,
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sht3xd_gpio_callback,
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BIT(CONFIG_SHT3XD_GPIO_PIN_NUM));
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if (gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb) < 0) {
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SYS_LOG_DBG("Failed to set gpio callback!");
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return -EIO;
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}
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#if defined(CONFIG_SHT3XD_TRIGGER_OWN_FIBER)
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nano_sem_init(&drv_data->gpio_sem);
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fiber_start(drv_data->fiber_stack, CONFIG_SHT3XD_FIBER_STACK_SIZE,
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(nano_fiber_entry_t)sht3xd_fiber, POINTER_TO_INT(dev),
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0, CONFIG_SHT3XD_FIBER_PRIORITY, 0);
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#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_FIBER)
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drv_data->work.handler = sht3xd_work_cb;
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drv_data->dev = dev;
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#endif
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return 0;
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}
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