287 lines
7.4 KiB
C
287 lines
7.4 KiB
C
/* ST Microelectronics IIS2DLPC 3-axis accelerometer driver
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*
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* Copyright (c) 2020 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Datasheet:
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* https://www.st.com/resource/en/datasheet/iis2dlpc.pdf
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*/
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#define DT_DRV_COMPAT st_iis2dlpc
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#include <kernel.h>
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#include <drivers/sensor.h>
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#include <drivers/gpio.h>
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#include <logging/log.h>
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#include "iis2dlpc.h"
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LOG_MODULE_DECLARE(IIS2DLPC, CONFIG_SENSOR_LOG_LEVEL);
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/**
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* iis2dlpc_enable_int - enable selected int pin to generate interrupt
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*/
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static int iis2dlpc_enable_int(struct device *dev,
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enum sensor_trigger_type type, int enable)
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{
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const struct iis2dlpc_device_config *cfg = dev->config_info;
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struct iis2dlpc_data *iis2dlpc = dev->driver_data;
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iis2dlpc_reg_t int_route;
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if (cfg->int_pin == 1U) {
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/* set interrupt for pin INT1 */
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iis2dlpc_pin_int1_route_get(iis2dlpc->ctx,
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&int_route.ctrl4_int1_pad_ctrl);
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switch (type) {
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case SENSOR_TRIG_DATA_READY:
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int_route.ctrl4_int1_pad_ctrl.int1_drdy = enable;
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break;
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#ifdef CONFIG_IIS2DLPC_PULSE
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case SENSOR_TRIG_TAP:
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int_route.ctrl4_int1_pad_ctrl.int1_single_tap = enable;
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break;
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case SENSOR_TRIG_DOUBLE_TAP:
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int_route.ctrl4_int1_pad_ctrl.int1_tap = enable;
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break;
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#endif /* CONFIG_IIS2DLPC_PULSE */
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default:
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LOG_ERR("Unsupported trigger interrupt route");
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return -ENOTSUP;
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}
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return iis2dlpc_pin_int1_route_set(iis2dlpc->ctx,
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&int_route.ctrl4_int1_pad_ctrl);
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} else {
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/* set interrupt for pin INT2 */
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iis2dlpc_pin_int2_route_get(iis2dlpc->ctx,
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&int_route.ctrl5_int2_pad_ctrl);
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switch (type) {
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case SENSOR_TRIG_DATA_READY:
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int_route.ctrl5_int2_pad_ctrl.int2_drdy = enable;
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break;
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default:
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LOG_ERR("Unsupported trigger interrupt route");
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return -ENOTSUP;
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}
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return iis2dlpc_pin_int2_route_set(iis2dlpc->ctx,
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&int_route.ctrl5_int2_pad_ctrl);
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}
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}
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/**
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* iis2dlpc_trigger_set - link external trigger to event data ready
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*/
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int iis2dlpc_trigger_set(struct device *dev,
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const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler)
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{
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struct iis2dlpc_data *iis2dlpc = dev->driver_data;
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union axis3bit16_t raw;
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int state = (handler != NULL) ? PROPERTY_ENABLE : PROPERTY_DISABLE;
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switch (trig->type) {
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case SENSOR_TRIG_DATA_READY:
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iis2dlpc->drdy_handler = handler;
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if (state) {
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/* dummy read: re-trigger interrupt */
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iis2dlpc_acceleration_raw_get(iis2dlpc->ctx, raw.u8bit);
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}
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return iis2dlpc_enable_int(dev, SENSOR_TRIG_DATA_READY, state);
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#ifdef CONFIG_IIS2DLPC_PULSE
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case SENSOR_TRIG_TAP:
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iis2dlpc->tap_handler = handler;
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return iis2dlpc_enable_int(dev, SENSOR_TRIG_TAP, state);
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case SENSOR_TRIG_DOUBLE_TAP:
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iis2dlpc->double_tap_handler = handler;
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return iis2dlpc_enable_int(dev, SENSOR_TRIG_DOUBLE_TAP, state);
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#endif /* CONFIG_IIS2DLPC_PULSE */
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default:
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LOG_ERR("Unsupported sensor trigger");
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return -ENOTSUP;
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}
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}
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static int iis2dlpc_handle_drdy_int(struct device *dev)
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{
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struct iis2dlpc_data *data = dev->driver_data;
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struct sensor_trigger drdy_trig = {
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.type = SENSOR_TRIG_DATA_READY,
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.chan = SENSOR_CHAN_ALL,
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};
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if (data->drdy_handler) {
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data->drdy_handler(dev, &drdy_trig);
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}
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return 0;
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}
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#ifdef CONFIG_IIS2DLPC_PULSE
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static int iis2dlpc_handle_single_tap_int(struct device *dev)
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{
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struct iis2dlpc_data *data = dev->driver_data;
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sensor_trigger_handler_t handler = data->tap_handler;
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struct sensor_trigger pulse_trig = {
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.type = SENSOR_TRIG_TAP,
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.chan = SENSOR_CHAN_ALL,
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};
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if (handler) {
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handler(dev, &pulse_trig);
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}
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return 0;
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}
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static int iis2dlpc_handle_double_tap_int(struct device *dev)
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{
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struct iis2dlpc_data *data = dev->driver_data;
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sensor_trigger_handler_t handler = data->double_tap_handler;
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struct sensor_trigger pulse_trig = {
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.type = SENSOR_TRIG_DOUBLE_TAP,
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.chan = SENSOR_CHAN_ALL,
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};
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if (handler) {
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handler(dev, &pulse_trig);
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}
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return 0;
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}
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#endif /* CONFIG_IIS2DLPC_PULSE */
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/**
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* iis2dlpc_handle_interrupt - handle the drdy event
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* read data and call handler if registered any
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*/
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static void iis2dlpc_handle_interrupt(void *arg)
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{
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struct device *dev = (struct device *)arg;
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struct iis2dlpc_data *iis2dlpc = dev->driver_data;
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const struct iis2dlpc_device_config *cfg = dev->config_info;
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iis2dlpc_all_sources_t sources;
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iis2dlpc_all_sources_get(iis2dlpc->ctx, &sources);
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if (sources.status_dup.drdy) {
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iis2dlpc_handle_drdy_int(dev);
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}
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#ifdef CONFIG_IIS2DLPC_PULSE
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if (sources.status_dup.single_tap) {
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iis2dlpc_handle_single_tap_int(dev);
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}
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if (sources.status_dup.double_tap) {
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iis2dlpc_handle_double_tap_int(dev);
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}
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#endif /* CONFIG_IIS2DLPC_PULSE */
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gpio_pin_interrupt_configure(iis2dlpc->gpio, cfg->int_gpio_pin,
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GPIO_INT_EDGE_TO_ACTIVE);
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}
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static void iis2dlpc_gpio_callback(struct device *dev,
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struct gpio_callback *cb, u32_t pins)
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{
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struct iis2dlpc_data *iis2dlpc =
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CONTAINER_OF(cb, struct iis2dlpc_data, gpio_cb);
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if ((pins & BIT(iis2dlpc->gpio_pin)) == 0U) {
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return;
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}
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gpio_pin_interrupt_configure(dev, iis2dlpc->gpio_pin,
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GPIO_INT_DISABLE);
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#if defined(CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD)
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k_sem_give(&iis2dlpc->gpio_sem);
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#elif defined(CONFIG_IIS2DLPC_TRIGGER_GLOBAL_THREAD)
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k_work_submit(&iis2dlpc->work);
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#endif /* CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD */
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}
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#ifdef CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD
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static void iis2dlpc_thread(int dev_ptr, int unused)
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{
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struct device *dev = INT_TO_POINTER(dev_ptr);
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struct iis2dlpc_data *iis2dlpc = dev->driver_data;
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ARG_UNUSED(unused);
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while (1) {
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k_sem_take(&iis2dlpc->gpio_sem, K_FOREVER);
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iis2dlpc_handle_interrupt(dev);
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}
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}
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#endif /* CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD */
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#ifdef CONFIG_IIS2DLPC_TRIGGER_GLOBAL_THREAD
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static void iis2dlpc_work_cb(struct k_work *work)
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{
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struct iis2dlpc_data *iis2dlpc =
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CONTAINER_OF(work, struct iis2dlpc_data, work);
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iis2dlpc_handle_interrupt(iis2dlpc->dev);
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}
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#endif /* CONFIG_IIS2DLPC_TRIGGER_GLOBAL_THREAD */
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int iis2dlpc_init_interrupt(struct device *dev)
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{
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struct iis2dlpc_data *iis2dlpc = dev->driver_data;
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const struct iis2dlpc_device_config *cfg = dev->config_info;
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int ret;
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/* setup data ready gpio interrupt (INT1 or INT2) */
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iis2dlpc->gpio = device_get_binding(cfg->int_gpio_port);
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if (iis2dlpc->gpio == NULL) {
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LOG_DBG("Cannot get pointer to %s device",
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cfg->int_gpio_port);
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return -EINVAL;
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}
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#if defined(CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD)
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k_sem_init(&iis2dlpc->gpio_sem, 0, UINT_MAX);
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k_thread_create(&iis2dlpc->thread, iis2dlpc->thread_stack,
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CONFIG_IIS2DLPC_THREAD_STACK_SIZE,
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(k_thread_entry_t)iis2dlpc_thread, dev,
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0, NULL, K_PRIO_COOP(CONFIG_IIS2DLPC_THREAD_PRIORITY),
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0, K_NO_WAIT);
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#elif defined(CONFIG_IIS2DLPC_TRIGGER_GLOBAL_THREAD)
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iis2dlpc->work.handler = iis2dlpc_work_cb;
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iis2dlpc->dev = dev;
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#endif /* CONFIG_IIS2DLPC_TRIGGER_OWN_THREAD */
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iis2dlpc->gpio_pin = cfg->int_gpio_pin;
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ret = gpio_pin_configure(iis2dlpc->gpio, cfg->int_gpio_pin,
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GPIO_INPUT | cfg->int_gpio_flags);
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if (ret < 0) {
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LOG_DBG("Could not configure gpio");
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return ret;
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}
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gpio_init_callback(&iis2dlpc->gpio_cb,
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iis2dlpc_gpio_callback,
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BIT(cfg->int_gpio_pin));
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if (gpio_add_callback(iis2dlpc->gpio, &iis2dlpc->gpio_cb) < 0) {
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LOG_DBG("Could not set gpio callback");
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return -EIO;
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}
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/* enable interrupt on int1/int2 in pulse mode */
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if (iis2dlpc_int_notification_set(iis2dlpc->ctx, IIS2DLPC_INT_PULSED)) {
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return -EIO;
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}
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return gpio_pin_interrupt_configure(iis2dlpc->gpio, cfg->int_gpio_pin,
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GPIO_INT_EDGE_TO_ACTIVE);
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}
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