| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <device.h> |
| #include <i2c.h> |
| #include <gpio.h> |
| #include <nanokernel.h> |
| #include <sensor.h> |
| #include <misc/util.h> |
| #include <misc/__assert.h> |
| |
| #include "sensor_hdc1008.h" |
| |
| static void hdc1008_gpio_callback(struct device *dev, |
| struct gpio_callback *cb, uint32_t pins) |
| { |
| struct hdc1008_data *drv_data = |
| CONTAINER_OF(cb, struct hdc1008_data, gpio_cb); |
| |
| ARG_UNUSED(pins); |
| |
| gpio_pin_disable_callback(dev, CONFIG_HDC1008_GPIO_PIN_NUM); |
| nano_sem_give(&drv_data->data_sem); |
| } |
| |
| static int hdc1008_sample_fetch(struct device *dev, enum sensor_channel chan) |
| { |
| struct hdc1008_data *drv_data = dev->driver_data; |
| uint8_t buf[4]; |
| int rc; |
| |
| __ASSERT(chan == SENSOR_CHAN_ALL); |
| |
| gpio_pin_enable_callback(drv_data->gpio, CONFIG_HDC1008_GPIO_PIN_NUM); |
| |
| buf[0] = HDC1008_REG_TEMP; |
| rc = i2c_write(drv_data->i2c, buf, 1, HDC1008_I2C_ADDRESS); |
| if (rc != 0) { |
| SYS_LOG_DBG("Failed to write address pointer"); |
| return -EIO; |
| } |
| |
| nano_sem_take(&drv_data->data_sem, TICKS_UNLIMITED); |
| |
| rc = i2c_read(drv_data->i2c, buf, 4, HDC1008_I2C_ADDRESS); |
| if (rc != 0) { |
| SYS_LOG_DBG("Failed to read sample data"); |
| return -EIO; |
| } |
| |
| drv_data->t_sample = (buf[0] << 8) + buf[1]; |
| drv_data->rh_sample = (buf[2] << 8) + buf[3]; |
| |
| return 0; |
| } |
| |
| |
| static int hdc1008_channel_get(struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| struct hdc1008_data *drv_data = dev->driver_data; |
| uint64_t tmp; |
| |
| /* |
| * See datasheet "Temperature Register" and "Humidity |
| * Register" sections for more details on processing |
| * sample data. |
| */ |
| if (chan == SENSOR_CHAN_TEMP) { |
| /* val = -40 + 165 * sample / 2^16 */ |
| tmp = 165 * (uint64_t)drv_data->t_sample; |
| val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO; |
| val->val1 = (int32_t)(tmp >> 16) - 40; |
| val->val2 = (1000000 * (tmp & 0xFFFF)) >> 16; |
| } else if (chan == SENSOR_CHAN_HUMIDITY) { |
| /* val = 100000 * sample / 2^16 */ |
| tmp = 100000 * (uint64_t)drv_data->rh_sample; |
| val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO; |
| val->val1 = tmp >> 16; |
| val->val2 = (1000000 * (tmp & 0xFFFF)) >> 16; |
| } else { |
| return -ENOTSUP; |
| } |
| |
| return 0; |
| } |
| |
| static struct sensor_driver_api hdc1008_driver_api = { |
| .sample_fetch = hdc1008_sample_fetch, |
| .channel_get = hdc1008_channel_get, |
| }; |
| |
| int hdc1008_init(struct device *dev) |
| { |
| struct hdc1008_data *drv_data = dev->driver_data; |
| int rc; |
| |
| drv_data->i2c = device_get_binding(CONFIG_HDC1008_I2C_MASTER_DEV_NAME); |
| if (drv_data->i2c == NULL) { |
| SYS_LOG_DBG("Failed to get pointer to %s device!", |
| CONFIG_HDC1008_I2C_MASTER_DEV_NAME); |
| return -EINVAL; |
| } |
| |
| nano_sem_init(&drv_data->data_sem); |
| |
| /* setup data ready gpio interrupt */ |
| drv_data->gpio = device_get_binding(CONFIG_HDC1008_GPIO_DEV_NAME); |
| if (drv_data->gpio == NULL) { |
| SYS_LOG_DBG("Failed to get pointer to %s device", |
| CONFIG_HDC1008_GPIO_DEV_NAME); |
| return -EINVAL; |
| } |
| |
| gpio_pin_configure(drv_data->gpio, CONFIG_HDC1008_GPIO_PIN_NUM, |
| GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE | |
| GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE); |
| |
| gpio_init_callback(&drv_data->gpio_cb, |
| hdc1008_gpio_callback, |
| BIT(CONFIG_HDC1008_GPIO_PIN_NUM)); |
| |
| rc = gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb); |
| if (rc != 0) { |
| SYS_LOG_DBG("Failed to set GPIO callback"); |
| return -EIO; |
| } |
| |
| dev->driver_api = &hdc1008_driver_api; |
| |
| return 0; |
| } |
| |
| struct hdc1008_data hdc1008_data; |
| |
| DEVICE_INIT(hdc1008, CONFIG_HDC1008_NAME, hdc1008_init, &hdc1008_data, |
| NULL, SECONDARY, CONFIG_HDC1008_INIT_PRIORITY); |