blob: 64181ce1afd268b82946357671316d85457ea78f [file] [log] [blame]
/* ST Microelectronics STTS751 temperature sensor
*
* Copyright (c) 2019 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*
* Datasheet:
* https://www.st.com/resource/en/datasheet/stts751.pdf
*/
#define DT_DRV_COMPAT st_stts751
#include <kernel.h>
#include <drivers/sensor.h>
#include <drivers/gpio.h>
#include <logging/log.h>
#include "stts751.h"
LOG_MODULE_DECLARE(STTS751, CONFIG_SENSOR_LOG_LEVEL);
/**
* stts751_enable_int - enable selected int pin to generate interrupt
*/
static int stts751_enable_int(struct device *dev, int enable)
{
struct stts751_data *stts751 = dev->driver_data;
u8_t en = (enable) ? 0 : 1;
return stts751_pin_event_route_set(stts751->ctx, en);
}
/**
* stts751_trigger_set - link external trigger to event data ready
*/
int stts751_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct stts751_data *stts751 = dev->driver_data;
if (trig->chan == SENSOR_CHAN_ALL) {
stts751->thsld_handler = handler;
if (handler) {
return stts751_enable_int(dev, 1);
} else {
return stts751_enable_int(dev, 0);
}
}
return -ENOTSUP;
}
/**
* stts751_handle_interrupt - handle the thsld event
* read data and call handler if registered any
*/
static void stts751_handle_interrupt(void *arg)
{
struct device *dev = arg;
struct stts751_data *stts751 = dev->driver_data;
const struct stts751_config *cfg = dev->config_info;
struct sensor_trigger thsld_trigger = {
.type = SENSOR_TRIG_THRESHOLD,
};
stts751_status_t status;
stts751_status_reg_get(stts751->ctx, &status);
if (stts751->thsld_handler != NULL &&
(status.t_high || status.t_low)) {
stts751->thsld_handler(dev, &thsld_trigger);
}
gpio_pin_interrupt_configure(stts751->gpio, cfg->event_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}
static void stts751_gpio_callback(struct device *dev,
struct gpio_callback *cb, u32_t pins)
{
const struct stts751_config *cfg = dev->config_info;
struct stts751_data *stts751 =
CONTAINER_OF(cb, struct stts751_data, gpio_cb);
ARG_UNUSED(pins);
gpio_pin_interrupt_configure(dev, cfg->event_pin, GPIO_INT_DISABLE);
#if defined(CONFIG_STTS751_TRIGGER_OWN_THREAD)
k_sem_give(&stts751->gpio_sem);
#elif defined(CONFIG_STTS751_TRIGGER_GLOBAL_THREAD)
k_work_submit(&stts751->work);
#endif /* CONFIG_STTS751_TRIGGER_OWN_THREAD */
}
#ifdef CONFIG_STTS751_TRIGGER_OWN_THREAD
static void stts751_thread(int dev_ptr, int unused)
{
struct device *dev = INT_TO_POINTER(dev_ptr);
struct stts751_data *stts751 = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&stts751->gpio_sem, K_FOREVER);
stts751_handle_interrupt(dev);
}
}
#endif /* CONFIG_STTS751_TRIGGER_OWN_THREAD */
#ifdef CONFIG_STTS751_TRIGGER_GLOBAL_THREAD
static void stts751_work_cb(struct k_work *work)
{
struct stts751_data *stts751 =
CONTAINER_OF(work, struct stts751_data, work);
stts751_handle_interrupt(stts751->dev);
}
#endif /* CONFIG_STTS751_TRIGGER_GLOBAL_THREAD */
int stts751_init_interrupt(struct device *dev)
{
struct stts751_data *stts751 = dev->driver_data;
const struct stts751_config *cfg = dev->config_info;
int ret;
/* setup data ready gpio interrupt */
stts751->gpio = device_get_binding(cfg->event_port);
if (stts751->gpio == NULL) {
LOG_DBG("Cannot get pointer to %s device", cfg->event_port);
return -EINVAL;
}
#if defined(CONFIG_STTS751_TRIGGER_OWN_THREAD)
k_sem_init(&stts751->gpio_sem, 0, UINT_MAX);
k_thread_create(&stts751->thread, stts751->thread_stack,
CONFIG_STTS751_THREAD_STACK_SIZE,
(k_thread_entry_t)stts751_thread, dev,
0, NULL, K_PRIO_COOP(CONFIG_STTS751_THREAD_PRIORITY),
0, K_NO_WAIT);
#elif defined(CONFIG_STTS751_TRIGGER_GLOBAL_THREAD)
stts751->work.handler = stts751_work_cb;
stts751->dev = dev;
#endif /* CONFIG_STTS751_TRIGGER_OWN_THREAD */
ret = gpio_pin_configure(stts751->gpio, cfg->event_pin,
GPIO_INPUT | cfg->int_flags);
if (ret < 0) {
LOG_DBG("Could not configure gpio");
return ret;
}
gpio_init_callback(&stts751->gpio_cb, stts751_gpio_callback,
BIT(cfg->event_pin));
if (gpio_add_callback(stts751->gpio, &stts751->gpio_cb) < 0) {
LOG_DBG("Could not set gpio callback");
return -EIO;
}
/* Enable interrupt on high temperature */
float temp_hi = (float) CONFIG_STTS751_TEMP_HI_THRESHOLD;
float temp_lo = (float) CONFIG_STTS751_TEMP_LO_THRESHOLD;
stts751_high_temperature_threshold_set(stts751->ctx,
stts751_from_celsius_to_lsb(temp_hi));
stts751_low_temperature_threshold_set(stts751->ctx,
stts751_from_celsius_to_lsb(temp_lo));
return gpio_pin_interrupt_configure(stts751->gpio, cfg->event_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}