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/*
* 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 <kernel.h>
#include <sensor.h>
#include <misc/util.h>
#include <misc/__assert.h>
#include "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);
k_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];
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
gpio_pin_enable_callback(drv_data->gpio, CONFIG_HDC1008_GPIO_PIN_NUM);
buf[0] = HDC1008_REG_TEMP;
if (i2c_write(drv_data->i2c, buf, 1, HDC1008_I2C_ADDRESS) < 0) {
SYS_LOG_DBG("Failed to write address pointer");
return -EIO;
}
k_sem_take(&drv_data->data_sem, K_FOREVER);
if (i2c_read(drv_data->i2c, buf, 4, HDC1008_I2C_ADDRESS) < 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->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->val1 = tmp >> 16;
val->val2 = (1000000 * (tmp & 0xFFFF)) >> 16;
} else {
return -ENOTSUP;
}
return 0;
}
static const struct sensor_driver_api hdc1008_driver_api = {
.sample_fetch = hdc1008_sample_fetch,
.channel_get = hdc1008_channel_get,
};
static uint16_t read16(struct device *dev, uint8_t a, uint8_t d)
{
uint8_t buf[2];
if (i2c_burst_read(dev, a, d, (uint8_t *)buf, 2) < 0) {
SYS_LOG_ERR("Error reading register.");
}
return (buf[0] << 8 | buf[1]);
}
static int hdc1008_init(struct device *dev)
{
struct hdc1008_data *drv_data = dev->driver_data;
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;
}
if (read16(drv_data->i2c, HDC1008_I2C_ADDRESS, HDC1000_MANUFID) != 0x5449) {
SYS_LOG_ERR("Failed to get correct manufacturer ID");
return -EINVAL;
}
if (read16(drv_data->i2c, HDC1008_I2C_ADDRESS, HDC1000_DEVICEID) != 0x1000) {
SYS_LOG_ERR("Failed to get correct device ID");
return -EINVAL;
}
k_sem_init(&drv_data->data_sem, 0, UINT_MAX);
/* 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));
if (gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb) < 0) {
SYS_LOG_DBG("Failed to set GPIO callback");
return -EIO;
}
dev->driver_api = &hdc1008_driver_api;
return 0;
}
static struct hdc1008_data hdc1008_data;
DEVICE_INIT(hdc1008, CONFIG_HDC1008_NAME, hdc1008_init, &hdc1008_data,
NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY);
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