| /* |
| * Copyright (c) 2018 STMicroelectronics |
| * |
| * LIS2MDL mag interrupt configuration and management |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <kernel.h> |
| #include <sensor.h> |
| #include <gpio.h> |
| |
| #include "lis2mdl.h" |
| |
| #define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL |
| #include <logging/log.h> |
| LOG_MODULE_DECLARE(LIS2MDL); |
| |
| static int lis2mdl_enable_int(struct device *dev, int enable) |
| { |
| struct lis2mdl_data *lis2mdl = dev->driver_data; |
| |
| /* set interrupt on mag */ |
| return i2c_reg_update_byte(lis2mdl->i2c, lis2mdl->i2c_addr, |
| LIS2MDL_CFG_REG_C, |
| LIS2MDL_INT_MAG_MASK, |
| enable ? LIS2MDL_INT_MAG : 0); |
| } |
| |
| /* link external trigger to event data ready */ |
| int lis2mdl_trigger_set(struct device *dev, |
| const struct sensor_trigger *trig, |
| sensor_trigger_handler_t handler) |
| { |
| struct lis2mdl_data *lis2mdl = dev->driver_data; |
| u8_t raw[LIS2MDL_OUT_REG_SIZE]; |
| |
| if (trig->chan == SENSOR_CHAN_MAGN_XYZ) { |
| lis2mdl->handler_drdy = handler; |
| if (handler) { |
| /* fetch raw data sample: re-trigger lost interrupt */ |
| if (i2c_burst_read(lis2mdl->i2c, lis2mdl->i2c_addr, |
| LIS2MDL_OUT_REG, raw, |
| sizeof(raw)) < 0) { |
| LOG_ERR("Failed to fetch raw data sample."); |
| return -EIO; |
| } |
| return lis2mdl_enable_int(dev, 1); |
| } else { |
| return lis2mdl_enable_int(dev, 0); |
| } |
| } |
| |
| return -ENOTSUP; |
| } |
| |
| /* handle the drdy event: read data and call handler if registered any */ |
| static void lis2mdl_handle_interrupt(void *arg) |
| { |
| struct device *dev = arg; |
| struct lis2mdl_data *lis2mdl = dev->driver_data; |
| const struct lis2mdl_device_config *const config = |
| dev->config->config_info; |
| struct sensor_trigger drdy_trigger = { |
| .type = SENSOR_TRIG_DATA_READY, |
| }; |
| |
| if (lis2mdl->handler_drdy != NULL) { |
| lis2mdl->handler_drdy(dev, &drdy_trigger); |
| } |
| |
| gpio_pin_enable_callback(lis2mdl->gpio, config->gpio_pin); |
| } |
| |
| static void lis2mdl_gpio_callback(struct device *dev, |
| struct gpio_callback *cb, u32_t pins) |
| { |
| struct lis2mdl_data *lis2mdl = |
| CONTAINER_OF(cb, struct lis2mdl_data, gpio_cb); |
| const struct lis2mdl_device_config *const config = |
| dev->config->config_info; |
| |
| ARG_UNUSED(pins); |
| |
| gpio_pin_disable_callback(dev, config->gpio_pin); |
| |
| #if defined(CONFIG_LIS2MDL_TRIGGER_OWN_THREAD) |
| k_sem_give(&lis2mdl->gpio_sem); |
| #elif defined(CONFIG_LIS2MDL_TRIGGER_GLOBAL_THREAD) |
| k_work_submit(&lis2mdl->work); |
| #endif |
| } |
| |
| #ifdef CONFIG_LIS2MDL_TRIGGER_OWN_THREAD |
| static void lis2mdl_thread(int dev_ptr, int unused) |
| { |
| struct device *dev = INT_TO_POINTER(dev_ptr); |
| struct lis2mdl_data *lis2mdl = dev->driver_data; |
| |
| ARG_UNUSED(unused); |
| |
| while (1) { |
| k_sem_take(&lis2mdl->gpio_sem, K_FOREVER); |
| lis2mdl_handle_interrupt(dev); |
| } |
| } |
| #endif |
| |
| #ifdef CONFIG_LIS2MDL_TRIGGER_GLOBAL_THREAD |
| static void lis2mdl_work_cb(struct k_work *work) |
| { |
| struct lis2mdl_data *lis2mdl = |
| CONTAINER_OF(work, struct lis2mdl_data, work); |
| |
| lis2mdl_handle_interrupt(lis2mdl->dev); |
| } |
| #endif |
| |
| int lis2mdl_init_interrupt(struct device *dev) |
| { |
| struct lis2mdl_data *lis2mdl = dev->driver_data; |
| const struct lis2mdl_device_config *const config = |
| dev->config->config_info; |
| |
| /* setup data ready gpio interrupt */ |
| lis2mdl->gpio = device_get_binding(config->gpio_name); |
| if (lis2mdl->gpio == NULL) { |
| LOG_DBG("Cannot get pointer to %s device", |
| config->gpio_name); |
| return -EINVAL; |
| } |
| |
| gpio_pin_configure(lis2mdl->gpio, config->gpio_pin, |
| GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE | |
| GPIO_INT_ACTIVE_HIGH | GPIO_INT_DEBOUNCE); |
| |
| gpio_init_callback(&lis2mdl->gpio_cb, |
| lis2mdl_gpio_callback, |
| BIT(config->gpio_pin)); |
| |
| if (gpio_add_callback(lis2mdl->gpio, &lis2mdl->gpio_cb) < 0) { |
| LOG_DBG("Could not set gpio callback"); |
| return -EIO; |
| } |
| |
| #if defined(CONFIG_LIS2MDL_TRIGGER_OWN_THREAD) |
| k_sem_init(&lis2mdl->gpio_sem, 0, UINT_MAX); |
| k_thread_create(&lis2mdl->thread, lis2mdl->thread_stack, |
| CONFIG_LIS2MDL_THREAD_STACK_SIZE, |
| (k_thread_entry_t)lis2mdl_thread, dev, |
| 0, NULL, K_PRIO_COOP(CONFIG_LIS2MDL_THREAD_PRIORITY), |
| 0, 0); |
| #elif defined(CONFIG_LIS2MDL_TRIGGER_GLOBAL_THREAD) |
| lis2mdl->work.handler = lis2mdl_work_cb; |
| lis2mdl->dev = dev; |
| #endif |
| |
| gpio_pin_enable_callback(lis2mdl->gpio, config->gpio_pin); |
| |
| return 0; |
| } |