| /* ST Microelectronics LIS2DW12 3-axis accelerometer driver |
| * |
| * Copyright (c) 2019 STMicroelectronics |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Datasheet: |
| * https://www.st.com/resource/en/datasheet/lis2dw12.pdf |
| */ |
| |
| #include <kernel.h> |
| #include <sensor.h> |
| #include <gpio.h> |
| #include <logging/log.h> |
| |
| #include "lis2dw12.h" |
| |
| #define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL |
| LOG_MODULE_DECLARE(LIS2DW12); |
| |
| /** |
| * lis2dw12_enable_int - enable selected int pin to generate interrupt |
| */ |
| static int lis2dw12_enable_int(struct device *dev, int enable) |
| { |
| const struct lis2dw12_device_config *cfg = dev->config->config_info; |
| struct lis2dw12_data *lis2dw12 = dev->driver_data; |
| |
| /* set interrupt */ |
| if (cfg->int_pin == 1U) |
| return lis2dw12->hw_tf->update_reg(lis2dw12, |
| LIS2DW12_CTRL4_ADDR, |
| LIS2DW12_INT1_DRDY, |
| enable); |
| |
| return lis2dw12->hw_tf->update_reg(lis2dw12, |
| LIS2DW12_CTRL5_ADDR, |
| LIS2DW12_INT2_DRDY, |
| enable); |
| } |
| |
| /** |
| * lis2dw12_trigger_set - link external trigger to event data ready |
| */ |
| int lis2dw12_trigger_set(struct device *dev, |
| const struct sensor_trigger *trig, |
| sensor_trigger_handler_t handler) |
| { |
| struct lis2dw12_data *lis2dw12 = dev->driver_data; |
| u8_t raw[6]; |
| |
| if (trig->chan == SENSOR_CHAN_ACCEL_XYZ) { |
| lis2dw12->handler_drdy = handler; |
| if (handler) { |
| /* dummy read: re-trigger interrupt */ |
| lis2dw12->hw_tf->read_data(lis2dw12, |
| LIS2DW12_OUT_X_L_ADDR, raw, |
| sizeof(raw)); |
| return lis2dw12_enable_int(dev, LIS2DW12_EN_BIT); |
| } else { |
| return lis2dw12_enable_int(dev, LIS2DW12_DIS_BIT); |
| } |
| } |
| |
| return -ENOTSUP; |
| } |
| |
| /** |
| * lis2dw12_handle_interrupt - handle the drdy event |
| * read data and call handler if registered any |
| */ |
| static void lis2dw12_handle_interrupt(void *arg) |
| { |
| struct device *dev = arg; |
| struct lis2dw12_data *lis2dw12 = dev->driver_data; |
| struct sensor_trigger drdy_trigger = { |
| .type = SENSOR_TRIG_DATA_READY, |
| }; |
| const struct lis2dw12_device_config *cfg = dev->config->config_info; |
| |
| if (lis2dw12->handler_drdy != NULL) { |
| lis2dw12->handler_drdy(dev, &drdy_trigger); |
| } |
| |
| gpio_pin_enable_callback(lis2dw12->gpio, cfg->int_gpio_pin); |
| } |
| |
| static void lis2dw12_gpio_callback(struct device *dev, |
| struct gpio_callback *cb, u32_t pins) |
| { |
| struct lis2dw12_data *lis2dw12 = |
| CONTAINER_OF(cb, struct lis2dw12_data, gpio_cb); |
| const struct lis2dw12_device_config *cfg = dev->config->config_info; |
| |
| ARG_UNUSED(pins); |
| |
| gpio_pin_disable_callback(dev, cfg->int_gpio_pin); |
| |
| #if defined(CONFIG_LIS2DW12_TRIGGER_OWN_THREAD) |
| k_sem_give(&lis2dw12->gpio_sem); |
| #elif defined(CONFIG_LIS2DW12_TRIGGER_GLOBAL_THREAD) |
| k_work_submit(&lis2dw12->work); |
| #endif /* CONFIG_LIS2DW12_TRIGGER_OWN_THREAD */ |
| } |
| |
| #ifdef CONFIG_LIS2DW12_TRIGGER_OWN_THREAD |
| static void lis2dw12_thread(int dev_ptr, int unused) |
| { |
| struct device *dev = INT_TO_POINTER(dev_ptr); |
| struct lis2dw12_data *lis2dw12 = dev->driver_data; |
| |
| ARG_UNUSED(unused); |
| |
| while (1) { |
| k_sem_take(&lis2dw12->gpio_sem, K_FOREVER); |
| lis2dw12_handle_interrupt(dev); |
| } |
| } |
| #endif /* CONFIG_LIS2DW12_TRIGGER_OWN_THREAD */ |
| |
| #ifdef CONFIG_LIS2DW12_TRIGGER_GLOBAL_THREAD |
| static void lis2dw12_work_cb(struct k_work *work) |
| { |
| struct lis2dw12_data *lis2dw12 = |
| CONTAINER_OF(work, struct lis2dw12_data, work); |
| |
| lis2dw12_handle_interrupt(lis2dw12->dev); |
| } |
| #endif /* CONFIG_LIS2DW12_TRIGGER_GLOBAL_THREAD */ |
| |
| int lis2dw12_init_interrupt(struct device *dev) |
| { |
| struct lis2dw12_data *lis2dw12 = dev->driver_data; |
| const struct lis2dw12_device_config *cfg = dev->config->config_info; |
| int ret; |
| |
| /* setup data ready gpio interrupt (INT1 or INT2) */ |
| lis2dw12->gpio = device_get_binding(cfg->int_gpio_port); |
| if (lis2dw12->gpio == NULL) { |
| LOG_DBG("Cannot get pointer to %s device", |
| cfg->int_gpio_port); |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_LIS2DW12_TRIGGER_OWN_THREAD) |
| k_sem_init(&lis2dw12->gpio_sem, 0, UINT_MAX); |
| |
| k_thread_create(&lis2dw12->thread, lis2dw12->thread_stack, |
| CONFIG_LIS2DW12_THREAD_STACK_SIZE, |
| (k_thread_entry_t)lis2dw12_thread, dev, |
| 0, NULL, K_PRIO_COOP(CONFIG_LIS2DW12_THREAD_PRIORITY), |
| 0, 0); |
| #elif defined(CONFIG_LIS2DW12_TRIGGER_GLOBAL_THREAD) |
| lis2dw12->work.handler = lis2dw12_work_cb; |
| lis2dw12->dev = dev; |
| #endif /* CONFIG_LIS2DW12_TRIGGER_OWN_THREAD */ |
| |
| ret = gpio_pin_configure(lis2dw12->gpio, cfg->int_gpio_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(&lis2dw12->gpio_cb, |
| lis2dw12_gpio_callback, |
| BIT(cfg->int_gpio_pin)); |
| |
| if (gpio_add_callback(lis2dw12->gpio, &lis2dw12->gpio_cb) < 0) { |
| LOG_DBG("Could not set gpio callback"); |
| return -EIO; |
| } |
| |
| /* enable interrupt on int1/int2 in pulse mode */ |
| if (lis2dw12->hw_tf->update_reg(lis2dw12, LIS2DW12_CTRL3_ADDR, |
| LIS2DW12_LIR_MASK, LIS2DW12_DIS_BIT)) { |
| return -EIO; |
| } |
| |
| return gpio_pin_enable_callback(lis2dw12->gpio, cfg->int_gpio_pin); |
| } |