driver/sensor: add IIS3DHHC accelerometer sensor

Add support to STM IIS3DHHC the ultra-low noise, high-stability three-axis linear accelerometer. Signed-off-by: Armando Visconti <armando.visconti@st.com>
2019-09-05 15:19:40 +02:00 · 2019-09-05 15:19:40 +02:00 · 871d132577
commit 871d132577
parent b4094ea6c1
12 changed files with 754 additions and 0 deletions
--- a/drivers/sensor/iis3dhhc/iis3dhhc_trigger.c
+++ b/drivers/sensor/iis3dhhc/iis3dhhc_trigger.c
@ -0,0 +1,172 @@
+/* ST Microelectronics IIS3DHHC accelerometer sensor
+ *
+ * Copyright (c) 2019 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Datasheet:
+ * https://www.st.com/resource/en/datasheet/iis3dhhc.pdf
+ */
+
+#include <kernel.h>
+#include <drivers/sensor.h>
+#include <drivers/gpio.h>
+#include <logging/log.h>
+
+#include "iis3dhhc.h"
+
+#define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL
+LOG_MODULE_DECLARE(IIS3DHHC);
+
+/**
+ * iis3dhhc_enable_int - enable selected int pin to generate interrupt
+ */
+static int iis3dhhc_enable_int(struct device *dev, int enable)
+{
+	struct iis3dhhc_data *iis3dhhc = dev->driver_data;
+
+	/* set interrupt */
+#ifdef CONFIG_IIS3DHHC_DRDY_INT1
+	return iis3dhhc_drdy_on_int1_set(iis3dhhc->ctx, enable);
+#else
+	return iis3dhhc_drdy_on_int2_set(iis3dhhc->ctx, enable);
+#endif
+}
+
+/**
+ * iis3dhhc_trigger_set - link external trigger to event data ready
+ */
+int iis3dhhc_trigger_set(struct device *dev,
+			 const struct sensor_trigger *trig,
+			 sensor_trigger_handler_t handler)
+{
+	struct iis3dhhc_data *iis3dhhc = dev->driver_data;
+	axis3bit16_t raw;
+
+	if (trig->chan == SENSOR_CHAN_ACCEL_XYZ) {
+		iis3dhhc->handler_drdy = handler;
+		if (handler) {
+			/* dummy read: re-trigger interrupt */
+			iis3dhhc_acceleration_raw_get(iis3dhhc->ctx, raw.u8bit);
+			return iis3dhhc_enable_int(dev, PROPERTY_ENABLE);
+		} else {
+			return iis3dhhc_enable_int(dev, PROPERTY_DISABLE);
+		}
+	}
+
+	return -ENOTSUP;
+}
+
+/**
+ * iis3dhhc_handle_interrupt - handle the drdy event
+ * read data and call handler if registered any
+ */
+static void iis3dhhc_handle_interrupt(void *arg)
+{
+	struct device *dev = arg;
+	struct iis3dhhc_data *iis3dhhc = dev->driver_data;
+	struct sensor_trigger drdy_trigger = {
+		.type = SENSOR_TRIG_DATA_READY,
+	};
+	const struct iis3dhhc_config *cfg = dev->config->config_info;
+
+	if (iis3dhhc->handler_drdy != NULL) {
+		iis3dhhc->handler_drdy(dev, &drdy_trigger);
+	}
+
+	gpio_pin_enable_callback(iis3dhhc->gpio, cfg->int_pin);
+}
+
+static void iis3dhhc_gpio_callback(struct device *dev,
+				    struct gpio_callback *cb, u32_t pins)
+{
+	struct iis3dhhc_data *iis3dhhc =
+		CONTAINER_OF(cb, struct iis3dhhc_data, gpio_cb);
+	const struct iis3dhhc_config *cfg = dev->config->config_info;
+
+	ARG_UNUSED(pins);
+
+	gpio_pin_disable_callback(dev, cfg->int_pin);
+
+#if defined(CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD)
+	k_sem_give(&iis3dhhc->gpio_sem);
+#elif defined(CONFIG_IIS3DHHC_TRIGGER_GLOBAL_THREAD)
+	k_work_submit(&iis3dhhc->work);
+#endif /* CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD */
+}
+
+#ifdef CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD
+static void iis3dhhc_thread(int dev_ptr, int unused)
+{
+	struct device *dev = INT_TO_POINTER(dev_ptr);
+	struct iis3dhhc_data *iis3dhhc = dev->driver_data;
+
+	ARG_UNUSED(unused);
+
+	while (1) {
+		k_sem_take(&iis3dhhc->gpio_sem, K_FOREVER);
+		iis3dhhc_handle_interrupt(dev);
+	}
+}
+#endif /* CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD */
+
+#ifdef CONFIG_IIS3DHHC_TRIGGER_GLOBAL_THREAD
+static void iis3dhhc_work_cb(struct k_work *work)
+{
+	struct iis3dhhc_data *iis3dhhc =
+		CONTAINER_OF(work, struct iis3dhhc_data, work);
+
+	iis3dhhc_handle_interrupt(iis3dhhc->dev);
+}
+#endif /* CONFIG_IIS3DHHC_TRIGGER_GLOBAL_THREAD */
+
+int iis3dhhc_init_interrupt(struct device *dev)
+{
+	struct iis3dhhc_data *iis3dhhc = dev->driver_data;
+	const struct iis3dhhc_config *cfg = dev->config->config_info;
+	int ret;
+
+	/* setup data ready gpio interrupt (INT1 or INT2) */
+	iis3dhhc->gpio = device_get_binding(cfg->int_port);
+	if (iis3dhhc->gpio == NULL) {
+		LOG_DBG("Cannot get pointer to %s device", cfg->int_port);
+		return -EINVAL;
+	}
+
+#if defined(CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD)
+	k_sem_init(&iis3dhhc->gpio_sem, 0, UINT_MAX);
+
+	k_thread_create(&iis3dhhc->thread, iis3dhhc->thread_stack,
+		       CONFIG_IIS3DHHC_THREAD_STACK_SIZE,
+		       (k_thread_entry_t)iis3dhhc_thread, dev,
+		       0, NULL, K_PRIO_COOP(CONFIG_IIS3DHHC_THREAD_PRIORITY),
+		       0, 0);
+#elif defined(CONFIG_IIS3DHHC_TRIGGER_GLOBAL_THREAD)
+	iis3dhhc->work.handler = iis3dhhc_work_cb;
+	iis3dhhc->dev = dev;
+#endif /* CONFIG_IIS3DHHC_TRIGGER_OWN_THREAD */
+
+	ret = gpio_pin_configure(iis3dhhc->gpio, cfg->int_pin,
+			   GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE |
+			   GPIO_INT_ACTIVE_HIGH | GPIO_INT_DEBOUNCE);
+	if (ret < 0) {
+		LOG_DBG("Could not configure gpio");
+		return ret;
+	}
+
+	gpio_init_callback(&iis3dhhc->gpio_cb,
+			   iis3dhhc_gpio_callback,
+			   BIT(cfg->int_pin));
+
+	if (gpio_add_callback(iis3dhhc->gpio, &iis3dhhc->gpio_cb) < 0) {
+		LOG_DBG("Could not set gpio callback");
+		return -EIO;
+	}
+
+	/* enable interrupt on int1/int2 in pulse mode */
+	if (iis3dhhc_drdy_notification_mode_set(iis3dhhc->ctx, IIS3DHHC_PULSED)) {
+		return -EIO;
+	}
+
+	return gpio_pin_enable_callback(iis3dhhc->gpio, cfg->int_pin);
+}