| /* |
| * 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 <gpio.h> |
| #include <misc/util.h> |
| #include <nanokernel.h> |
| #include <sensor.h> |
| |
| #include "sensor_sht3xd.h" |
| |
| extern struct sht3xd_data sht3xd_driver; |
| |
| static uint16_t sht3xd_temp_processed_to_raw(const struct sensor_value *val) |
| { |
| uint32_t val2; |
| uint64_t uval; |
| |
| if (val->type == SENSOR_TYPE_INT) { |
| val2 = 0; |
| } else { |
| val2 = val->val2; |
| } |
| |
| /* ret = (val + 45) * (2^16 - 1) / 175 */ |
| uval = (uint64_t)(val->val1 + 45) * 1000000 + val2; |
| return ((uval * 0xFFFF) / 175) / 1000000; |
| } |
| |
| static int sht3xd_rh_processed_to_raw(const struct sensor_value *val) |
| { |
| uint32_t val2; |
| uint64_t uval; |
| |
| if (val->type == SENSOR_TYPE_INT) { |
| val2 = 0; |
| } else { |
| val2 = val->val2; |
| } |
| |
| /* ret = val * (2^16 -1) / 100000 */ |
| uval = (uint64_t)val->val1 * 1000000 + 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 (val->type != SENSOR_TYPE_INT && |
| val->type != SENSOR_TYPE_INT_PLUS_MICRO) { |
| return -ENOTSUP; |
| } |
| |
| 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) { |
| DBG("Failed to write threshold value!\n"); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static void sht3xd_gpio_callback(struct device *dev, uint32_t pin) |
| { |
| gpio_pin_disable_callback(dev, pin); |
| |
| #if defined(CONFIG_SHT3XD_TRIGGER_OWN_FIBER) |
| nano_sem_give(&sht3xd_driver.gpio_sem); |
| #elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_FIBER) |
| nano_isr_fifo_put(sensor_get_work_fifo(), &sht3xd_driver.work); |
| #endif |
| } |
| |
| static void sht3xd_fiber_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_FIBER |
| static void sht3xd_fiber(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) { |
| nano_fiber_sem_take(&drv_data->gpio_sem, TICKS_UNLIMITED); |
| sht3xd_fiber_cb(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; |
| int rc; |
| |
| 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 */ |
| rc = sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_SET, 0xFFFF); |
| if (rc != 0) { |
| DBG("Failed to write threshold high set value!\n"); |
| return -EIO; |
| } |
| |
| rc = sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_HIGH_CLEAR, |
| 0xFFFF); |
| if (rc != 0) { |
| DBG("Failed to write threshold high clear value!\n"); |
| return -EIO; |
| } |
| |
| rc = sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0); |
| if (rc != 0) { |
| DBG("Failed to write threshold low set value!\n"); |
| return -EIO; |
| } |
| |
| rc = sht3xd_write_reg(drv_data, SHT3XD_CMD_WRITE_TH_LOW_SET, 0); |
| if (rc != 0) { |
| DBG("Failed to write threshold low clear value!\n"); |
| return -EIO; |
| } |
| |
| /* setup gpio interrupt */ |
| drv_data->gpio = device_get_binding(CONFIG_SHT3XD_GPIO_DEV_NAME); |
| if (drv_data->gpio == NULL) { |
| DBG("Failed to get pointer to %s device!\n", |
| 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); |
| |
| rc = gpio_set_callback(drv_data->gpio, sht3xd_gpio_callback); |
| if (rc != 0) { |
| DBG("Failed to set gpio callback!\n"); |
| return -EIO; |
| } |
| |
| #if defined(CONFIG_SHT3XD_TRIGGER_OWN_FIBER) |
| nano_sem_init(&drv_data->gpio_sem); |
| |
| fiber_start(drv_data->fiber_stack, CONFIG_SHT3XD_FIBER_STACK_SIZE, |
| (nano_fiber_entry_t)sht3xd_fiber, POINTER_TO_INT(dev), |
| 0, CONFIG_SHT3XD_FIBER_PRIORITY, 0); |
| #elif defined(CONFIG_SHT3XD_TRIGGER_GLOBAL_FIBER) |
| drv_data->work.handler = sht3xd_fiber_cb; |
| drv_data->work.arg = dev; |
| #endif |
| |
| return 0; |
| } |