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