147 lines
3.9 KiB
C
147 lines
3.9 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 <i2c.h>
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#include <gpio.h>
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#include <nanokernel.h>
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#include <sensor.h>
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#include <misc/util.h>
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#include <misc/__assert.h>
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#include "sensor_hdc1008.h"
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static void hdc1008_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 hdc1008_data *drv_data =
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CONTAINER_OF(cb, struct hdc1008_data, gpio_cb);
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ARG_UNUSED(pins);
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gpio_pin_disable_callback(dev, CONFIG_HDC1008_GPIO_PIN_NUM);
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nano_sem_give(&drv_data->data_sem);
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}
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static int hdc1008_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct hdc1008_data *drv_data = dev->driver_data;
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uint8_t buf[4];
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__ASSERT(chan == SENSOR_CHAN_ALL);
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gpio_pin_enable_callback(drv_data->gpio, CONFIG_HDC1008_GPIO_PIN_NUM);
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buf[0] = HDC1008_REG_TEMP;
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if (i2c_write(drv_data->i2c, buf, 1, HDC1008_I2C_ADDRESS) < 0) {
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SYS_LOG_DBG("Failed to write address pointer");
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return -EIO;
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}
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nano_sem_take(&drv_data->data_sem, TICKS_UNLIMITED);
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if (i2c_read(drv_data->i2c, buf, 4, HDC1008_I2C_ADDRESS) < 0) {
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SYS_LOG_DBG("Failed to read sample data");
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return -EIO;
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}
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drv_data->t_sample = (buf[0] << 8) + buf[1];
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drv_data->rh_sample = (buf[2] << 8) + buf[3];
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return 0;
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}
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static int hdc1008_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct hdc1008_data *drv_data = dev->driver_data;
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uint64_t tmp;
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/*
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* See datasheet "Temperature Register" and "Humidity
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* Register" sections for more details on processing
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* sample data.
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*/
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if (chan == SENSOR_CHAN_TEMP) {
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/* val = -40 + 165 * sample / 2^16 */
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tmp = 165 * (uint64_t)drv_data->t_sample;
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val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
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val->val1 = (int32_t)(tmp >> 16) - 40;
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val->val2 = (1000000 * (tmp & 0xFFFF)) >> 16;
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} else if (chan == SENSOR_CHAN_HUMIDITY) {
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/* val = 100000 * sample / 2^16 */
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tmp = 100000 * (uint64_t)drv_data->rh_sample;
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val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
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val->val1 = tmp >> 16;
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val->val2 = (1000000 * (tmp & 0xFFFF)) >> 16;
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} else {
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return -ENOTSUP;
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}
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return 0;
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}
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static struct sensor_driver_api hdc1008_driver_api = {
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.sample_fetch = hdc1008_sample_fetch,
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.channel_get = hdc1008_channel_get,
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};
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int hdc1008_init(struct device *dev)
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{
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struct hdc1008_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(CONFIG_HDC1008_I2C_MASTER_DEV_NAME);
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if (drv_data->i2c == NULL) {
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SYS_LOG_DBG("Failed to get pointer to %s device!",
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CONFIG_HDC1008_I2C_MASTER_DEV_NAME);
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return -EINVAL;
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}
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nano_sem_init(&drv_data->data_sem);
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/* setup data ready gpio interrupt */
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drv_data->gpio = device_get_binding(CONFIG_HDC1008_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_HDC1008_GPIO_DEV_NAME);
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return -EINVAL;
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}
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gpio_pin_configure(drv_data->gpio, CONFIG_HDC1008_GPIO_PIN_NUM,
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GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE |
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GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE);
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gpio_init_callback(&drv_data->gpio_cb,
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hdc1008_gpio_callback,
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BIT(CONFIG_HDC1008_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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dev->driver_api = &hdc1008_driver_api;
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return 0;
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}
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struct hdc1008_data hdc1008_data;
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DEVICE_INIT(hdc1008, CONFIG_HDC1008_NAME, hdc1008_init, &hdc1008_data,
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NULL, SECONDARY, CONFIG_HDC1008_INIT_PRIORITY);
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