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drivers/sensor: add support to IIS2MDC magnetometer sensor

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The IIS2MDC is a 3D digital magnetometer ultra-low power sensor
for industrial applications, which can be interfaced through
either I2C or SPI bus.

https://www.st.com/resource/en/datasheet/iis2mdc.pdf

This driver is based on stmemsc i/f v1.02.

Signed-off-by: Armando Visconti <armando.visconti@st.com>
This commit is contained in:
Armando Visconti 2020-01-31 10:39:41 +01:00 • committed by Maureen Helm
commit a302786e9b
14 changed files with 933 additions and 0 deletions
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151
drivers/sensor/iis2mdc/iis2mdc_trigger.c Normal file
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/* 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
*/
#include <kernel.h>
#include <drivers/sensor.h>
#include <drivers/gpio.h>
#include <logging/log.h>
#include "iis2mdc.h"
LOG_MODULE_DECLARE(IIS2MDC, CONFIG_SENSOR_LOG_LEVEL);
static int iis2mdc_enable_int(struct device *dev, int enable)
{
struct iis2mdc_data *iis2mdc = dev->driver_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(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct iis2mdc_data *iis2mdc = dev->driver_data;
union axis3bit16_t raw;
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.u8bit);
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(void *arg)
{
struct device *dev = arg;
struct iis2mdc_data *iis2mdc = dev->driver_data;
const struct iis2mdc_config *const config =
dev->config->config_info;
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(iis2mdc->gpio, config->drdy_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}
static void iis2mdc_gpio_callback(struct device *dev,
struct gpio_callback *cb, u32_t pins)
{
struct iis2mdc_data *iis2mdc =
CONTAINER_OF(cb, struct iis2mdc_data, gpio_cb);
const struct iis2mdc_config *const config = dev->config->config_info;
ARG_UNUSED(pins);
gpio_pin_interrupt_configure(dev, config->drdy_pin, 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(int dev_ptr, int unused)
{
struct device *dev = INT_TO_POINTER(dev_ptr);
struct iis2mdc_data *iis2mdc = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&iis2mdc->gpio_sem, K_FOREVER);
iis2mdc_handle_interrupt(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(struct device *dev)
{
struct iis2mdc_data *iis2mdc = dev->driver_data;
const struct iis2mdc_config *const config = dev->config->config_info;
/* setup data ready gpio interrupt */
iis2mdc->gpio = device_get_binding(config->drdy_port);
if (iis2mdc->gpio == NULL) {
LOG_DBG("Cannot get pointer to %s device",
config->drdy_port);
return -EINVAL;
}
#if defined(CONFIG_IIS2MDC_TRIGGER_OWN_THREAD)
k_sem_init(&iis2mdc->gpio_sem, 0, UINT_MAX);
k_thread_create(&iis2mdc->thread, iis2mdc->thread_stack,
CONFIG_IIS2MDC_THREAD_STACK_SIZE,
(k_thread_entry_t)iis2mdc_thread, dev,
0, 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;
iis2mdc->dev = dev;
#endif
gpio_pin_configure(iis2mdc->gpio, config->drdy_pin,
GPIO_INPUT | config->drdy_flags);
gpio_init_callback(&iis2mdc->gpio_cb,
iis2mdc_gpio_callback,
BIT(config->drdy_pin));
if (gpio_add_callback(iis2mdc->gpio, &iis2mdc->gpio_cb) < 0) {
LOG_DBG("Could not set gpio callback");
return -EIO;
}
return gpio_pin_interrupt_configure(iis2mdc->gpio, config->drdy_pin,
GPIO_INT_EDGE_TO_ACTIVE);
}