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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 <misc/util.h>
#include <kernel.h>
#include <sensor.h>
#include "sht3xd.h"
static uint16_t sht3xd_temp_processed_to_raw(const struct sensor_value *val)
{
uint64_t uval;
/* ret = (val + 45) * (2^16 - 1) / 175 */
uval = (uint64_t)(val->val1 + 45) * 1000000 + val->val2;
return ((uval * 0xFFFF) / 175) / 1000000;
}
static int sht3xd_rh_processed_to_raw(const struct sensor_value *val)
{
uint64_t uval;
/* ret = val * (2^16 -1) / 100000 */
uval = (uint64_t)val->val1 * 1000000 + val->val2;
return ((uval * 0xFFFF) / 100000) / 1000000;
}
int sht3xd_attr_set(struct device *dev,
enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
struct sht3xd_data *drv_data = dev->driver_data;
uint16_t set_cmd, clear_cmd, reg_val, temp, rh;
if (attr == SENSOR_ATTR_LOWER_THRESH) {
if (chan == SENSOR_CHAN_TEMP) {
drv_data->t_low = sht3xd_temp_processed_to_raw(val);
} else if (chan == SENSOR_CHAN_HUMIDITY) {
drv_data->rh_low = sht3xd_rh_processed_to_raw(val);
} else {
return -ENOTSUP;
}
set_cmd = SHT3XD_CMD_WRITE_TH_LOW_SET;
clear_cmd = SHT3XD_CMD_WRITE_TH_LOW_CLEAR;
temp = drv_data->t_low;
rh = drv_data->rh_low;
} else if (attr == SENSOR_ATTR_UPPER_THRESH) {
if (chan == SENSOR_CHAN_TEMP) {
drv_data->t_high = sht3xd_temp_processed_to_raw(val);
} else if (chan == SENSOR_CHAN_HUMIDITY) {
drv_data->rh_high = sht3xd_rh_processed_to_raw(val);
} else {
return -ENOTSUP;
}
set_cmd = SHT3XD_CMD_WRITE_TH_HIGH_SET;
clear_cmd = SHT3XD_CMD_WRITE_TH_HIGH_CLEAR;
temp = drv_data->t_high;
rh = drv_data->rh_high;
} else {
return -ENOTSUP;
}
reg_val = (rh & 0xFE00) | ((temp & 0xFF80) >> 7);
if (sht3xd_write_reg(drv_data, set_cmd, reg_val) < 0 ||
sht3xd_write_reg(drv_data, clear_cmd, reg_val) < 0) {
SYS_LOG_DBG("Failed to write threshold value!");
return -EIO;
}
return 0;
}
static void sht3xd_gpio_callback(struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct sht3xd_data *drv_data =
CONTAINER_OF(cb, struct sht3xd_data, gpio_cb);
ARG_UNUSED(pins);
gpio_pin_disable_callback(dev, CONFIG_SHT3XD_GPIO_PIN_NUM);
#if defined(CONFIG_SHT3XD_TRIGGER_OWN_THREAD)
k_sem_give(&drv_data->gpio_sem);
#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD)
k_work_submit(&drv_data->work);
#endif
}
static void sht3xd_thread_cb(void *arg)
{
struct device *dev = arg;
struct sht3xd_data *drv_data = dev->driver_data;
if (drv_data->handler != NULL) {
drv_data->handler(dev, &drv_data->trigger);
}
gpio_pin_enable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
}
#ifdef CONFIG_SHT3XD_TRIGGER_OWN_THREAD
static void sht3xd_thread(int dev_ptr, int unused)
{
struct device *dev = INT_TO_POINTER(dev_ptr);
struct sht3xd_data *drv_data = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&drv_data->gpio_sem, K_FOREVER);
sht3xd_thread_cb(dev);
}
}
#endif
#ifdef CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD
static void sht3xd_work_cb(struct k_work *work)
{
struct sht3xd_data *drv_data =
CONTAINER_OF(work, struct sht3xd_data, work);
sht3xd_thread_cb(drv_data->dev);
}
#endif
int sht3xd_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct sht3xd_data *drv_data = dev->driver_data;
if (trig->type != SENSOR_TRIG_THRESHOLD) {
return -ENOTSUP;
}
gpio_pin_disable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
drv_data->handler = handler;
drv_data->trigger = *trig;
gpio_pin_enable_callback(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM);
return 0;
}
int sht3xd_init_interrupt(struct device *dev)
{
struct sht3xd_data *drv_data = dev->driver_data;
drv_data->t_low = 0;
drv_data->rh_low = 0;
drv_data->t_high = 0xFFFF;
drv_data->rh_high = 0xFFFF;
/* set alert thresholds to match reamsurement ranges */
if (sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_SET, 0xFFFF)
< 0) {
SYS_LOG_DBG("Failed to write threshold high set value!");
return -EIO;
}
if (sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_CLEAR,
0xFFFF) < 0) {
SYS_LOG_DBG("Failed to write threshold high clear value!");
return -EIO;
}
if (sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
SYS_LOG_DBG("Failed to write threshold low set value!");
return -EIO;
}
if (sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0) < 0) {
SYS_LOG_DBG("Failed to write threshold low clear value!");
return -EIO;
}
/* setup gpio interrupt */
drv_data->gpio = device_get_binding(CONFIG_SHT3XD_GPIO_DEV_NAME);
if (drv_data->gpio == NULL) {
SYS_LOG_DBG("Failed to get pointer to %s device!",
CONFIG_SHT3XD_GPIO_DEV_NAME);
return -EINVAL;
}
gpio_pin_configure(drv_data->gpio, CONFIG_SHT3XD_GPIO_PIN_NUM,
GPIO_DIR_IN | GPIO_INT | GPIO_INT_LEVEL |
GPIO_INT_ACTIVE_HIGH | GPIO_INT_DEBOUNCE);
gpio_init_callback(&drv_data->gpio_cb,
sht3xd_gpio_callback,
BIT(CONFIG_SHT3XD_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;
}
#if defined(CONFIG_SHT3XD_TRIGGER_OWN_THREAD)
k_sem_init(&drv_data->gpio_sem, 0, UINT_MAX);
k_thread_spawn(drv_data->thread_stack, CONFIG_SHT3XD_THREAD_STACK_SIZE,
(k_thread_entry_t)sht3xd_thread, POINTER_TO_INT(dev),
0, NULL, K_PRIO_COOP(CONFIG_SHT3XD_THREAD_PRIORITY), 0, 0);
#elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_THREAD)
drv_data->work.handler = sht3xd_work_cb;
drv_data->dev = dev;
#endif
return 0;
}
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