blob: c98dd6061fc2bf1171a9498092495b6f6d63e263 [file] [log] [blame]
/* ST Microelectronics IIS2MDC 3-axis magnetometer sensor
*
* Copyright (c) 2020 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*
* Datasheet:
* https://www.st.com/resource/en/datasheet/iis2mdc.pdf
*/
#define DT_DRV_COMPAT st_iis2mdc
#include <zephyr/kernel.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
#include "iis2mdc.h"
LOG_MODULE_DECLARE(IIS2MDC, CONFIG_SENSOR_LOG_LEVEL);
static int iis2mdc_enable_int(const struct device *dev, int enable)
{
struct iis2mdc_data *iis2mdc = dev->data;
/* set interrupt on mag */
return iis2mdc_drdy_on_pin_set(iis2mdc->ctx, enable);
}
/* link external trigger to event data ready */
int iis2mdc_trigger_set(const struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct iis2mdc_data *iis2mdc = dev->data;
int16_t raw[3];
if (trig->chan == SENSOR_CHAN_MAGN_XYZ) {
iis2mdc->handler_drdy = handler;
if (handler) {
/* fetch raw data sample: re-trigger lost interrupt */
iis2mdc_magnetic_raw_get(iis2mdc->ctx, raw);
return iis2mdc_enable_int(dev, 1);
} else {
return iis2mdc_enable_int(dev, 0);
}
}
return -ENOTSUP;
}
/* handle the drdy event: read data and call handler if registered any */
static void iis2mdc_handle_interrupt(const struct device *dev)
{
struct iis2mdc_data *iis2mdc = dev->data;
const struct iis2mdc_dev_config *const config = dev->config;
struct sensor_trigger drdy_trigger = {
.type = SENSOR_TRIG_DATA_READY,
};
if (iis2mdc->handler_drdy != NULL) {
iis2mdc->handler_drdy(dev, &drdy_trigger);
}
gpio_pin_interrupt_configure_dt(&config->gpio_drdy,
GPIO_INT_EDGE_TO_ACTIVE);
}
static void iis2mdc_gpio_callback(const struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct iis2mdc_data *iis2mdc =
CONTAINER_OF(cb, struct iis2mdc_data, gpio_cb);
const struct iis2mdc_dev_config *const config = iis2mdc->dev->config;
ARG_UNUSED(pins);
gpio_pin_interrupt_configure_dt(&config->gpio_drdy, GPIO_INT_DISABLE);
#if defined(CONFIG_IIS2MDC_TRIGGER_OWN_THREAD)
k_sem_give(&iis2mdc->gpio_sem);
#elif defined(CONFIG_IIS2MDC_TRIGGER_GLOBAL_THREAD)
k_work_submit(&iis2mdc->work);
#endif
}
#ifdef CONFIG_IIS2MDC_TRIGGER_OWN_THREAD
static void iis2mdc_thread(struct iis2mdc_data *iis2mdc)
{
while (1) {
k_sem_take(&iis2mdc->gpio_sem, K_FOREVER);
iis2mdc_handle_interrupt(iis2mdc->dev);
}
}
#endif
#ifdef CONFIG_IIS2MDC_TRIGGER_GLOBAL_THREAD
static void iis2mdc_work_cb(struct k_work *work)
{
struct iis2mdc_data *iis2mdc =
CONTAINER_OF(work, struct iis2mdc_data, work);
iis2mdc_handle_interrupt(iis2mdc->dev);
}
#endif
int iis2mdc_init_interrupt(const struct device *dev)
{
struct iis2mdc_data *iis2mdc = dev->data;
const struct iis2mdc_dev_config *const config = dev->config;
int ret;
/* setup data ready gpio interrupt */
if (!device_is_ready(config->gpio_drdy.port)) {
LOG_ERR("Cannot get pointer to drdy_gpio device");
return -ENODEV;
}
#if defined(CONFIG_IIS2MDC_TRIGGER_OWN_THREAD)
k_sem_init(&iis2mdc->gpio_sem, 0, K_SEM_MAX_LIMIT);
k_thread_create(&iis2mdc->thread, iis2mdc->thread_stack,
CONFIG_IIS2MDC_THREAD_STACK_SIZE,
(k_thread_entry_t)iis2mdc_thread, iis2mdc,
NULL, NULL, K_PRIO_COOP(CONFIG_IIS2MDC_THREAD_PRIORITY),
0, K_NO_WAIT);
#elif defined(CONFIG_IIS2MDC_TRIGGER_GLOBAL_THREAD)
iis2mdc->work.handler = iis2mdc_work_cb;
#endif
ret = gpio_pin_configure_dt(&config->gpio_drdy, GPIO_INPUT);
if (ret < 0) {
LOG_ERR("Could not configure gpio");
return ret;
}
gpio_init_callback(&iis2mdc->gpio_cb,
iis2mdc_gpio_callback,
BIT(config->gpio_drdy.pin));
if (gpio_add_callback(config->gpio_drdy.port, &iis2mdc->gpio_cb) < 0) {
LOG_DBG("Could not set gpio callback");
return -EIO;
}
return gpio_pin_interrupt_configure_dt(&config->gpio_drdy,
GPIO_INT_EDGE_TO_ACTIVE);
}