177 lines
4.0 KiB
C
177 lines
4.0 KiB
C
/*
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* Copyright (c) 2018 Analog Devices Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <drivers/gpio.h>
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#include <drivers/i2c.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <drivers/sensor.h>
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#include "adt7420.h"
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#include <logging/log.h>
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LOG_MODULE_DECLARE(ADT7420, CONFIG_SENSOR_LOG_LEVEL);
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static void setup_int(struct device *dev,
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bool enable)
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{
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struct adt7420_data *drv_data = dev->driver_data;
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const struct adt7420_dev_config *cfg = dev->config_info;
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gpio_flags_t flags = enable
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? GPIO_INT_EDGE_TO_ACTIVE
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: GPIO_INT_DISABLE;
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gpio_pin_interrupt_configure(drv_data->gpio, cfg->int_pin, flags);
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}
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static void handle_int(struct device *dev)
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{
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struct adt7420_data *drv_data = dev->driver_data;
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setup_int(dev, false);
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#if defined(CONFIG_ADT7420_TRIGGER_OWN_THREAD)
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k_sem_give(&drv_data->gpio_sem);
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#elif defined(CONFIG_ADT7420_TRIGGER_GLOBAL_THREAD)
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k_work_submit(&drv_data->work);
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#endif
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}
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static void process_int(struct device *dev)
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{
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struct adt7420_data *drv_data = dev->driver_data;
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const struct adt7420_dev_config *cfg = dev->config_info;
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uint8_t status;
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/* Clear the status */
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if (i2c_reg_read_byte(drv_data->i2c, cfg->i2c_addr,
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ADT7420_REG_STATUS, &status) < 0) {
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return;
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}
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if (drv_data->th_handler != NULL) {
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drv_data->th_handler(dev, &drv_data->th_trigger);
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}
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setup_int(dev, true);
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/* Check for pin that asserted while we were offline */
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int pv = gpio_pin_get(drv_data->gpio, cfg->int_pin);
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if (pv > 0) {
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handle_int(dev);
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}
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}
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static void adt7420_gpio_callback(struct device *dev,
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struct gpio_callback *cb, uint32_t pins)
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{
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struct adt7420_data *drv_data =
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CONTAINER_OF(cb, struct adt7420_data, gpio_cb);
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handle_int(drv_data->dev);
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}
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#if defined(CONFIG_ADT7420_TRIGGER_OWN_THREAD)
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static void adt7420_thread(int dev_ptr, int unused)
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{
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struct device *dev = INT_TO_POINTER(dev_ptr);
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struct adt7420_data *drv_data = dev->driver_data;
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ARG_UNUSED(unused);
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while (true) {
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k_sem_take(&drv_data->gpio_sem, K_FOREVER);
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process_int(dev);
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}
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}
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#elif defined(CONFIG_ADT7420_TRIGGER_GLOBAL_THREAD)
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static void adt7420_work_cb(struct k_work *work)
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{
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struct adt7420_data *drv_data =
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CONTAINER_OF(work, struct adt7420_data, work);
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process_int(drv_data->dev);
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}
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#endif
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int adt7420_trigger_set(struct device *dev,
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const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler)
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{
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struct adt7420_data *drv_data = dev->driver_data;
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const struct adt7420_dev_config *cfg = dev->config_info;
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setup_int(dev, false);
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if (trig->type != SENSOR_TRIG_THRESHOLD) {
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LOG_ERR("Unsupported sensor trigger");
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return -ENOTSUP;
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}
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drv_data->th_handler = handler;
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if (handler != NULL) {
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drv_data->th_trigger = *trig;
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setup_int(dev, true);
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/* Check whether already asserted */
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int pv = gpio_pin_get(drv_data->gpio, cfg->int_pin);
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if (pv > 0) {
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handle_int(dev);
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}
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}
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return 0;
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}
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int adt7420_init_interrupt(struct device *dev)
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{
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struct adt7420_data *drv_data = dev->driver_data;
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const struct adt7420_dev_config *cfg = dev->config_info;
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drv_data->gpio = device_get_binding(cfg->int_name);
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if (drv_data->gpio == NULL) {
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LOG_DBG("Failed to get pointer to %s device!",
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cfg->int_name);
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return -EINVAL;
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}
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gpio_init_callback(&drv_data->gpio_cb,
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adt7420_gpio_callback,
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BIT(cfg->int_pin));
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int rc = gpio_pin_configure(drv_data->gpio, cfg->int_pin,
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GPIO_INPUT | cfg->int_flags);
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if (rc == 0) {
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gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb);
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}
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if (rc != 0) {
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LOG_DBG("Failed to set gpio callback!");
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return rc;
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}
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drv_data->dev = dev;
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#if defined(CONFIG_ADT7420_TRIGGER_OWN_THREAD)
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k_sem_init(&drv_data->gpio_sem, 0, UINT_MAX);
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k_thread_create(&drv_data->thread, drv_data->thread_stack,
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CONFIG_ADT7420_THREAD_STACK_SIZE,
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(k_thread_entry_t)adt7420_thread, dev,
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0, NULL, K_PRIO_COOP(CONFIG_ADT7420_THREAD_PRIORITY),
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0, K_NO_WAIT);
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#elif defined(CONFIG_ADT7420_TRIGGER_GLOBAL_THREAD)
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drv_data->work.handler = adt7420_work_cb;
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#endif
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return 0;
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}
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