| /* |
| * Copyright (c) 2022 Würth Elektronik eiSos GmbH & Co. KG |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT we_wsen_tids |
| |
| #include <stdlib.h> |
| |
| #include <zephyr/logging/log.h> |
| |
| #include "wsen_tids.h" |
| |
| LOG_MODULE_DECLARE(WSEN_TIDS, CONFIG_SENSOR_LOG_LEVEL); |
| |
| #define THRESHOLD_TEMPERATURE2REGISTER_OFFSET (double)63. |
| #define THRESHOLD_TEMPERATURE2REGISTER_STEP (double)0.64 |
| |
| /* Enable/disable threshold interrupt handling */ |
| static inline void tids_setup_threshold_interrupt(const struct device *dev, bool enable) |
| { |
| const struct tids_config *cfg = dev->config; |
| unsigned int flags = enable ? GPIO_INT_EDGE_TO_ACTIVE : GPIO_INT_DISABLE; |
| |
| gpio_pin_interrupt_configure_dt(&cfg->gpio_threshold, flags); |
| } |
| |
| /* |
| * Is called when a "threshold exceeded" interrupt occurred. Triggers |
| * asynchronous processing of the interrupt in tids_process_threshold_interrupt(). |
| */ |
| static void tids_handle_threshold_interrupt(const struct device *dev) |
| { |
| struct tids_data *data = dev->data; |
| |
| /* Disable interrupt handling until the interrupt has been processed */ |
| tids_setup_threshold_interrupt(dev, false); |
| |
| #if defined(CONFIG_WSEN_TIDS_TRIGGER_OWN_THREAD) |
| k_sem_give(&data->threshold_sem); |
| #elif defined(CONFIG_WSEN_TIDS_TRIGGER_GLOBAL_THREAD) |
| k_work_submit(&data->work); |
| #endif |
| } |
| |
| /* |
| * Is called after a "threshold exceeded" interrupt occurred. |
| * Checks the sensor's status register for the limit exceeded flags and |
| * calls the trigger handler if one of the flags is set. |
| */ |
| static void tids_process_threshold_interrupt(const struct device *dev) |
| { |
| struct tids_data *data = dev->data; |
| TIDS_status_t status; |
| |
| /* |
| * Read the sensor's status register - this also causes the interrupt pin |
| * to be de-asserted |
| */ |
| if (TIDS_getStatusRegister(&data->sensor_interface, &status) != WE_SUCCESS) { |
| LOG_ERR("Failed to read status register"); |
| return; |
| } |
| |
| if (data->threshold_handler != NULL && |
| (status.upperLimitExceeded != 0 || status.lowerLimitExceeded != 0)) { |
| data->threshold_handler(dev, data->threshold_trigger); |
| } |
| |
| if (data->threshold_handler != NULL) { |
| tids_setup_threshold_interrupt(dev, true); |
| } |
| } |
| |
| /* Enables/disables processing of the "threshold exceeded" interrupt. */ |
| int tids_trigger_set(const struct device *dev, const struct sensor_trigger *trig, |
| sensor_trigger_handler_t handler) |
| { |
| struct tids_data *data = dev->data; |
| const struct tids_config *cfg = dev->config; |
| |
| if (trig->type != SENSOR_TRIG_THRESHOLD) { |
| LOG_ERR("Unsupported sensor trigger"); |
| return -ENOTSUP; |
| } |
| |
| tids_setup_threshold_interrupt(dev, false); |
| |
| data->threshold_handler = handler; |
| if (handler == NULL) { |
| return 0; |
| } |
| |
| data->threshold_trigger = trig; |
| |
| tids_setup_threshold_interrupt(dev, true); |
| |
| /* |
| * If threshold interrupt is active we probably won't get the rising edge, so |
| * invoke the callback manually. |
| */ |
| if (gpio_pin_get_dt(&cfg->gpio_threshold) > 0) { |
| tids_handle_threshold_interrupt(dev); |
| } |
| |
| return 0; |
| } |
| |
| static void tids_threshold_callback(const struct device *dev, struct gpio_callback *cb, |
| uint32_t pins) |
| { |
| struct tids_data *data = CONTAINER_OF(cb, struct tids_data, threshold_cb); |
| |
| ARG_UNUSED(pins); |
| |
| tids_handle_threshold_interrupt(data->dev); |
| } |
| |
| #ifdef CONFIG_WSEN_TIDS_TRIGGER_OWN_THREAD |
| static void tids_thread(struct tids_data *tids) |
| { |
| while (true) { |
| k_sem_take(&tids->threshold_sem, K_FOREVER); |
| tids_process_threshold_interrupt(tids->dev); |
| } |
| } |
| #endif /* CONFIG_WSEN_TIDS_TRIGGER_OWN_THREAD */ |
| |
| #ifdef CONFIG_WSEN_TIDS_TRIGGER_GLOBAL_THREAD |
| static void tids_work_cb(struct k_work *work) |
| { |
| struct tids_data *tids = CONTAINER_OF(work, struct tids_data, work); |
| |
| tids_process_threshold_interrupt(tids->dev); |
| } |
| #endif /* CONFIG_WSEN_TIDS_TRIGGER_GLOBAL_THREAD */ |
| |
| int tids_threshold_set(const struct device *dev, const struct sensor_value *thresh_value, |
| bool upper) |
| { |
| struct tids_data *data = dev->data; |
| double thresh = (sensor_value_to_double(thresh_value) / THRESHOLD_TEMPERATURE2REGISTER_STEP) |
| + THRESHOLD_TEMPERATURE2REGISTER_OFFSET; |
| |
| if (thresh < 0) { |
| thresh = 0; |
| } else if (thresh > 255) { |
| thresh = 255; |
| } |
| |
| if (upper) { |
| if (TIDS_setTempHighLimit(&data->sensor_interface, (uint8_t)thresh) != WE_SUCCESS) { |
| LOG_ERR("Failed to set high temperature threshold to %d.%d (%d).", |
| thresh_value->val1, abs(thresh_value->val2), (uint8_t)thresh); |
| return -EIO; |
| } |
| } else { |
| if (TIDS_setTempLowLimit(&data->sensor_interface, (uint8_t)thresh) != WE_SUCCESS) { |
| LOG_ERR("Failed to set low temperature threshold to %d.%d (%d).", |
| thresh_value->val1, abs(thresh_value->val2), (uint8_t)thresh); |
| return -EIO; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int tids_init_interrupt(const struct device *dev) |
| { |
| struct tids_data *data = dev->data; |
| const struct tids_config *cfg = dev->config; |
| int status; |
| struct sensor_value upper_limit; |
| struct sensor_value lower_limit; |
| |
| if (cfg->gpio_threshold.port == NULL) { |
| LOG_ERR("int-gpios is not defined in the device tree."); |
| return -EINVAL; |
| } |
| |
| if (!device_is_ready(cfg->gpio_threshold.port)) { |
| LOG_ERR("Device %s is not ready", cfg->gpio_threshold.port->name); |
| return -ENODEV; |
| } |
| |
| data->dev = dev; |
| |
| /* Setup threshold gpio interrupt */ |
| status = gpio_pin_configure_dt(&cfg->gpio_threshold, GPIO_INPUT); |
| if (status < 0) { |
| LOG_ERR("Failed to configure %s.%02u", cfg->gpio_threshold.port->name, |
| cfg->gpio_threshold.pin); |
| return status; |
| } |
| |
| gpio_init_callback(&data->threshold_cb, tids_threshold_callback, |
| BIT(cfg->gpio_threshold.pin)); |
| |
| status = gpio_add_callback(cfg->gpio_threshold.port, &data->threshold_cb); |
| if (status < 0) { |
| LOG_ERR("Failed to set gpio callback."); |
| return status; |
| } |
| |
| /* |
| * Enable interrupt on high/low temperature (interrupt generation is enabled if at |
| * least one threshold is non-zero) |
| */ |
| upper_limit.val1 = cfg->high_threshold; |
| upper_limit.val2 = 0; |
| lower_limit.val1 = cfg->low_threshold; |
| lower_limit.val2 = 0; |
| |
| status = tids_threshold_set(dev, &upper_limit, true); |
| if (status < 0) { |
| return status; |
| } |
| |
| status = tids_threshold_set(dev, &lower_limit, false); |
| if (status < 0) { |
| return status; |
| } |
| |
| #if defined(CONFIG_WSEN_TIDS_TRIGGER_OWN_THREAD) |
| k_sem_init(&data->threshold_sem, 0, K_SEM_MAX_LIMIT); |
| |
| k_thread_create(&data->thread, data->thread_stack, CONFIG_WSEN_TIDS_THREAD_STACK_SIZE, |
| (k_thread_entry_t)tids_thread, data, NULL, NULL, |
| K_PRIO_COOP(CONFIG_WSEN_TIDS_THREAD_PRIORITY), 0, K_NO_WAIT); |
| #elif defined(CONFIG_WSEN_TIDS_TRIGGER_GLOBAL_THREAD) |
| data->work.handler = tids_work_cb; |
| #endif |
| |
| tids_setup_threshold_interrupt(dev, true); |
| |
| return 0; |
| } |