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drivers/sensors: Add iis2dh accelerometer sensor support

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Add support to STM IIS2DH the ultra-low-power highperformance
three-axis linear accelerometer.

Signed-off-by: Armando Visconti <armando.visconti@st.com>
This commit is contained in:
Armando Visconti 2020-04-09 15:33:25 +02:00 • committed by Maureen Helm
commit 485f2d410c
16 changed files with 954 additions and 0 deletions
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191
drivers/sensor/iis2dh/iis2dh_trigger.c Normal file
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/* ST Microelectronics IIS2DH 3-axis accelerometer driver
*
* Copyright (c) 2020 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*
* Datasheet:
* https://www.st.com/resource/en/datasheet/iis2dh.pdf
*/
#include <kernel.h>
#include <drivers/sensor.h>
#include <drivers/gpio.h>
#include <logging/log.h>
#include "iis2dh.h"
LOG_MODULE_DECLARE(IIS2DH, CONFIG_SENSOR_LOG_LEVEL);
/**
* iis2dh_enable_int - enable selected int pin to generate interrupt
*/
static int iis2dh_enable_drdy(struct device *dev,
enum sensor_trigger_type type, int enable)
{
struct iis2dh_data *iis2dh = dev->driver_data;
iis2dh_ctrl_reg3_t reg3;
/* set interrupt for pin INT1 */
iis2dh_pin_int1_config_get(iis2dh->ctx, &reg3);
reg3.i1_drdy1 = enable;
return iis2dh_pin_int1_config_set(iis2dh->ctx, &reg3);
}
/**
* iis2dh_trigger_set - link external trigger to event data ready
*/
int iis2dh_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct iis2dh_data *iis2dh = dev->driver_data;
union axis3bit16_t raw;
int state = (handler != NULL) ? PROPERTY_ENABLE : PROPERTY_DISABLE;
switch (trig->type) {
case SENSOR_TRIG_DATA_READY:
iis2dh->drdy_handler = handler;
if (state) {
/* dummy read: re-trigger interrupt */
iis2dh_acceleration_raw_get(iis2dh->ctx, raw.u8bit);
}
return iis2dh_enable_drdy(dev, SENSOR_TRIG_DATA_READY, state);
default:
LOG_ERR("Unsupported sensor trigger");
return -ENOTSUP;
}
}
static int iis2dh_handle_drdy_int(struct device *dev)
{
struct iis2dh_data *data = dev->driver_data;
struct sensor_trigger drdy_trig = {
.type = SENSOR_TRIG_DATA_READY,
.chan = SENSOR_CHAN_ALL,
};
if (data->drdy_handler) {
data->drdy_handler(dev, &drdy_trig);
}
return 0;
}
/**
* iis2dh_handle_interrupt - handle the drdy event
* read data and call handler if registered any
*/
static void iis2dh_handle_interrupt(void *arg)
{
struct device *dev = (struct device *)arg;
struct iis2dh_data *iis2dh = dev->driver_data;
const struct iis2dh_device_config *cfg = dev->config_info;
iis2dh_handle_drdy_int(dev);
gpio_pin_interrupt_configure(iis2dh->gpio, cfg->int_gpio_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}
static void iis2dh_gpio_callback(struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct iis2dh_data *iis2dh =
CONTAINER_OF(cb, struct iis2dh_data, gpio_cb);
if ((pins & BIT(iis2dh->gpio_pin)) == 0U) {
return;
}
gpio_pin_interrupt_configure(dev, iis2dh->gpio_pin,
GPIO_INT_DISABLE);
#if defined(CONFIG_IIS2DH_TRIGGER_OWN_THREAD)
k_sem_give(&iis2dh->gpio_sem);
#elif defined(CONFIG_IIS2DH_TRIGGER_GLOBAL_THREAD)
k_work_submit(&iis2dh->work);
#endif /* CONFIG_IIS2DH_TRIGGER_OWN_THREAD */
}
#ifdef CONFIG_IIS2DH_TRIGGER_OWN_THREAD
static void iis2dh_thread(int dev_ptr, int unused)
{
struct device *dev = INT_TO_POINTER(dev_ptr);
struct iis2dh_data *iis2dh = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&iis2dh->gpio_sem, K_FOREVER);
iis2dh_handle_interrupt(dev);
}
}
#endif /* CONFIG_IIS2DH_TRIGGER_OWN_THREAD */
#ifdef CONFIG_IIS2DH_TRIGGER_GLOBAL_THREAD
static void iis2dh_work_cb(struct k_work *work)
{
struct iis2dh_data *iis2dh =
CONTAINER_OF(work, struct iis2dh_data, work);
iis2dh_handle_interrupt(iis2dh->dev);
}
#endif /* CONFIG_IIS2DH_TRIGGER_GLOBAL_THREAD */
int iis2dh_init_interrupt(struct device *dev)
{
struct iis2dh_data *iis2dh = dev->driver_data;
const struct iis2dh_device_config *cfg = dev->config_info;
int ret;
/* setup data ready gpio interrupt */
iis2dh->gpio = device_get_binding(cfg->int_gpio_port);
if (iis2dh->gpio == NULL) {
LOG_DBG("Cannot get pointer to %s device",
cfg->int_gpio_port);
return -EINVAL;
}
#if defined(CONFIG_IIS2DH_TRIGGER_OWN_THREAD)
k_sem_init(&iis2dh->gpio_sem, 0, UINT_MAX);
k_thread_create(&iis2dh->thread, iis2dh->thread_stack,
CONFIG_IIS2DH_THREAD_STACK_SIZE,
(k_thread_entry_t)iis2dh_thread, dev,
0, NULL, K_PRIO_COOP(CONFIG_IIS2DH_THREAD_PRIORITY),
0, K_NO_WAIT);
#elif defined(CONFIG_IIS2DH_TRIGGER_GLOBAL_THREAD)
iis2dh->work.handler = iis2dh_work_cb;
iis2dh->dev = dev;
#endif /* CONFIG_IIS2DH_TRIGGER_OWN_THREAD */
iis2dh->gpio_pin = cfg->int_gpio_pin;
ret = gpio_pin_configure(iis2dh->gpio, cfg->int_gpio_pin,
GPIO_INPUT | cfg->int_gpio_flags);
if (ret < 0) {
LOG_DBG("Could not configure gpio");
return ret;
}
gpio_init_callback(&iis2dh->gpio_cb,
iis2dh_gpio_callback,
BIT(cfg->int_gpio_pin));
if (gpio_add_callback(iis2dh->gpio, &iis2dh->gpio_cb) < 0) {
LOG_DBG("Could not set gpio callback");
return -EIO;
}
/* enable drdy on int1 in pulse mode */
if (iis2dh_int1_pin_notification_mode_set(iis2dh->ctx, IIS2DH_INT1_PULSED)) {
return -EIO;
}
return gpio_pin_interrupt_configure(iis2dh->gpio, cfg->int_gpio_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}