| /* |
| * Copyright (c) 2021 Vestas Wind Systems A/S |
| * Copyright (c) 2018 Alexander Wachter |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT zephyr_can_loopback |
| |
| #include <stdbool.h> |
| #include <string.h> |
| |
| #include <zephyr/drivers/can.h> |
| #include <zephyr/kernel.h> |
| #include <zephyr/logging/log.h> |
| |
| #include "can_utils.h" |
| |
| LOG_MODULE_REGISTER(can_loopback, CONFIG_CAN_LOG_LEVEL); |
| |
| struct can_loopback_frame { |
| struct zcan_frame frame; |
| can_tx_callback_t cb; |
| void *cb_arg; |
| struct k_sem *tx_compl; |
| }; |
| |
| struct can_loopback_filter { |
| can_rx_callback_t rx_cb; |
| void *cb_arg; |
| struct zcan_filter filter; |
| }; |
| |
| struct can_loopback_data { |
| struct can_loopback_filter filters[CONFIG_CAN_MAX_FILTER]; |
| struct k_mutex mtx; |
| bool loopback; |
| struct k_msgq tx_msgq; |
| char msgq_buffer[CONFIG_CAN_LOOPBACK_TX_MSGQ_SIZE * sizeof(struct can_loopback_frame)]; |
| struct k_thread tx_thread_data; |
| |
| K_KERNEL_STACK_MEMBER(tx_thread_stack, |
| CONFIG_CAN_LOOPBACK_TX_THREAD_STACK_SIZE); |
| }; |
| |
| static void dispatch_frame(const struct device *dev, |
| const struct zcan_frame *frame, |
| struct can_loopback_filter *filter) |
| { |
| struct zcan_frame frame_tmp = *frame; |
| |
| LOG_DBG("Receiving %d bytes. Id: 0x%x, ID type: %s %s", |
| frame->dlc, frame->id, |
| frame->id_type == CAN_STANDARD_IDENTIFIER ? |
| "standard" : "extended", |
| frame->rtr == CAN_DATAFRAME ? "" : ", RTR frame"); |
| |
| filter->rx_cb(dev, &frame_tmp, filter->cb_arg); |
| } |
| |
| static void tx_thread(void *arg1, void *arg2, void *arg3) |
| { |
| const struct device *dev = arg1; |
| struct can_loopback_data *data = dev->data; |
| struct can_loopback_frame frame; |
| struct can_loopback_filter *filter; |
| |
| ARG_UNUSED(arg2); |
| ARG_UNUSED(arg3); |
| |
| while (1) { |
| k_msgq_get(&data->tx_msgq, &frame, K_FOREVER); |
| k_mutex_lock(&data->mtx, K_FOREVER); |
| |
| for (int i = 0; i < CONFIG_CAN_MAX_FILTER; i++) { |
| filter = &data->filters[i]; |
| if (filter->rx_cb && |
| can_utils_filter_match(&frame.frame, &filter->filter) != 0) { |
| dispatch_frame(dev, &frame.frame, filter); |
| } |
| } |
| |
| k_mutex_unlock(&data->mtx); |
| |
| if (!frame.cb) { |
| k_sem_give(frame.tx_compl); |
| } else { |
| frame.cb(dev, 0, frame.cb_arg); |
| } |
| } |
| } |
| |
| static int can_loopback_send(const struct device *dev, |
| const struct zcan_frame *frame, |
| k_timeout_t timeout, can_tx_callback_t callback, |
| void *user_data) |
| { |
| struct can_loopback_data *data = dev->data; |
| struct can_loopback_frame loopback_frame; |
| uint8_t max_dlc = CAN_MAX_DLC; |
| struct k_sem tx_sem; |
| int ret; |
| |
| LOG_DBG("Sending %d bytes on %s. Id: 0x%x, ID type: %s %s", |
| frame->dlc, dev->name, frame->id, |
| frame->id_type == CAN_STANDARD_IDENTIFIER ? |
| "standard" : "extended", |
| frame->rtr == CAN_DATAFRAME ? "" : ", RTR frame"); |
| |
| #ifdef CONFIG_CAN_FD_MODE |
| if (frame->fd != 0) { |
| max_dlc = CANFD_MAX_DLC; |
| } |
| #endif /* CONFIG_CAN_FD_MODE */ |
| |
| if (frame->dlc > max_dlc) { |
| LOG_ERR("DLC of %d exceeds maximum (%d)", frame->dlc, max_dlc); |
| return -EINVAL; |
| } |
| |
| if (!data->loopback) { |
| return 0; |
| } |
| |
| loopback_frame.frame = *frame; |
| loopback_frame.cb = callback; |
| loopback_frame.cb_arg = user_data; |
| loopback_frame.tx_compl = &tx_sem; |
| |
| if (!callback) { |
| k_sem_init(&tx_sem, 0, 1); |
| } |
| |
| ret = k_msgq_put(&data->tx_msgq, &loopback_frame, timeout); |
| |
| if (!callback) { |
| k_sem_take(&tx_sem, K_FOREVER); |
| } |
| |
| return ret ? -EAGAIN : 0; |
| } |
| |
| |
| static inline int get_free_filter(struct can_loopback_filter *filters) |
| { |
| for (int i = 0; i < CONFIG_CAN_MAX_FILTER; i++) { |
| if (filters[i].rx_cb == NULL) { |
| return i; |
| } |
| } |
| |
| return -ENOSPC; |
| } |
| |
| static int can_loopback_add_rx_filter(const struct device *dev, can_rx_callback_t cb, |
| void *cb_arg, const struct zcan_filter *filter) |
| { |
| struct can_loopback_data *data = dev->data; |
| struct can_loopback_filter *loopback_filter; |
| int filter_id; |
| |
| LOG_DBG("Setting filter ID: 0x%x, mask: 0x%x", filter->id, |
| filter->id_mask); |
| LOG_DBG("Filter type: %s ID %s mask", |
| filter->id_type == CAN_STANDARD_IDENTIFIER ? |
| "standard" : "extended", |
| ((filter->id_type && (filter->id_mask == CAN_STD_ID_MASK)) || |
| (!filter->id_type && (filter->id_mask == CAN_EXT_ID_MASK))) ? |
| "with" : "without"); |
| |
| k_mutex_lock(&data->mtx, K_FOREVER); |
| filter_id = get_free_filter(data->filters); |
| |
| if (filter_id < 0) { |
| LOG_ERR("No free filter left"); |
| k_mutex_unlock(&data->mtx); |
| return filter_id; |
| } |
| |
| loopback_filter = &data->filters[filter_id]; |
| |
| loopback_filter->rx_cb = cb; |
| loopback_filter->cb_arg = cb_arg; |
| loopback_filter->filter = *filter; |
| k_mutex_unlock(&data->mtx); |
| |
| LOG_DBG("Filter added. ID: %d", filter_id); |
| |
| return filter_id; |
| } |
| |
| static void can_loopback_remove_rx_filter(const struct device *dev, int filter_id) |
| { |
| struct can_loopback_data *data = dev->data; |
| |
| LOG_DBG("Remove filter ID: %d", filter_id); |
| k_mutex_lock(&data->mtx, K_FOREVER); |
| data->filters[filter_id].rx_cb = NULL; |
| k_mutex_unlock(&data->mtx); |
| } |
| |
| static int can_loopback_get_capabilities(const struct device *dev, can_mode_t *cap) |
| { |
| ARG_UNUSED(dev); |
| |
| *cap = CAN_MODE_NORMAL | CAN_MODE_LOOPBACK; |
| |
| #if CONFIG_CAN_FD_MODE |
| *cap |= CAN_MODE_FD; |
| #endif /* CONFIG_CAN_FD_MODE */ |
| |
| return 0; |
| } |
| |
| static int can_loopback_set_mode(const struct device *dev, can_mode_t mode) |
| { |
| struct can_loopback_data *data = dev->data; |
| |
| #ifdef CONFIG_CAN_FD_MODE |
| if ((mode & ~(CAN_MODE_LOOPBACK | CAN_MODE_FD)) != 0) { |
| LOG_ERR("unsupported mode: 0x%08x", mode); |
| return -ENOTSUP; |
| } |
| #else |
| if ((mode & ~(CAN_MODE_LOOPBACK)) != 0) { |
| LOG_ERR("unsupported mode: 0x%08x", mode); |
| return -ENOTSUP; |
| } |
| #endif /* CONFIG_CAN_FD_MODE */ |
| |
| data->loopback = (mode & CAN_MODE_LOOPBACK) != 0 ? 1 : 0; |
| return 0; |
| } |
| |
| static int can_loopback_set_timing(const struct device *dev, |
| const struct can_timing *timing) |
| { |
| ARG_UNUSED(dev); |
| ARG_UNUSED(timing); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_CAN_FD_MODE |
| static int can_loopback_set_timing_data(const struct device *dev, |
| const struct can_timing *timing) |
| { |
| ARG_UNUSED(dev); |
| ARG_UNUSED(timing); |
| |
| return 0; |
| } |
| #endif /* CONFIG_CAN_FD_MODE */ |
| |
| static int can_loopback_get_state(const struct device *dev, enum can_state *state, |
| struct can_bus_err_cnt *err_cnt) |
| { |
| ARG_UNUSED(dev); |
| |
| if (state != NULL) { |
| *state = CAN_ERROR_ACTIVE; |
| } |
| |
| if (err_cnt) { |
| err_cnt->tx_err_cnt = 0; |
| err_cnt->rx_err_cnt = 0; |
| } |
| |
| return 0; |
| } |
| |
| #ifndef CONFIG_CAN_AUTO_BUS_OFF_RECOVERY |
| static int can_loopback_recover(const struct device *dev, k_timeout_t timeout) |
| { |
| ARG_UNUSED(dev); |
| ARG_UNUSED(timeout); |
| |
| return 0; |
| } |
| #endif /* CONFIG_CAN_AUTO_BUS_OFF_RECOVERY */ |
| |
| static void can_loopback_set_state_change_callback(const struct device *dev, |
| can_state_change_callback_t cb, |
| void *user_data) |
| { |
| ARG_UNUSED(dev); |
| ARG_UNUSED(cb); |
| ARG_UNUSED(user_data); |
| } |
| |
| static int can_loopback_get_core_clock(const struct device *dev, uint32_t *rate) |
| { |
| /* Return 16MHz as an realistic value for the testcases */ |
| *rate = 16000000; |
| return 0; |
| } |
| |
| static int can_loopback_get_max_filters(const struct device *dev, enum can_ide id_type) |
| { |
| ARG_UNUSED(id_type); |
| |
| return CONFIG_CAN_MAX_FILTER; |
| } |
| |
| static const struct can_driver_api can_loopback_driver_api = { |
| .get_capabilities = can_loopback_get_capabilities, |
| .set_mode = can_loopback_set_mode, |
| .set_timing = can_loopback_set_timing, |
| .send = can_loopback_send, |
| .add_rx_filter = can_loopback_add_rx_filter, |
| .remove_rx_filter = can_loopback_remove_rx_filter, |
| .get_state = can_loopback_get_state, |
| #ifndef CONFIG_CAN_AUTO_BUS_OFF_RECOVERY |
| .recover = can_loopback_recover, |
| #endif |
| .set_state_change_callback = can_loopback_set_state_change_callback, |
| .get_core_clock = can_loopback_get_core_clock, |
| .get_max_filters = can_loopback_get_max_filters, |
| .timing_min = { |
| .sjw = 0x1, |
| .prop_seg = 0x01, |
| .phase_seg1 = 0x01, |
| .phase_seg2 = 0x01, |
| .prescaler = 0x01 |
| }, |
| .timing_max = { |
| .sjw = 0x0F, |
| .prop_seg = 0x0F, |
| .phase_seg1 = 0x0F, |
| .phase_seg2 = 0x0F, |
| .prescaler = 0xFFFF |
| }, |
| #ifdef CONFIG_CAN_FD_MODE |
| .set_timing_data = can_loopback_set_timing_data, |
| .timing_data_min = { |
| .sjw = 0x1, |
| .prop_seg = 0x01, |
| .phase_seg1 = 0x01, |
| .phase_seg2 = 0x01, |
| .prescaler = 0x01 |
| }, |
| .timing_data_max = { |
| .sjw = 0x0F, |
| .prop_seg = 0x0F, |
| .phase_seg1 = 0x0F, |
| .phase_seg2 = 0x0F, |
| .prescaler = 0xFFFF |
| }, |
| #endif /* CONFIG_CAN_FD_MODE */ |
| }; |
| |
| static int can_loopback_init(const struct device *dev) |
| { |
| struct can_loopback_data *data = dev->data; |
| k_tid_t tx_tid; |
| |
| k_mutex_init(&data->mtx); |
| |
| for (int i = 0; i < CONFIG_CAN_MAX_FILTER; i++) { |
| data->filters[i].rx_cb = NULL; |
| } |
| |
| k_msgq_init(&data->tx_msgq, data->msgq_buffer, sizeof(struct can_loopback_frame), |
| CONFIG_CAN_LOOPBACK_TX_MSGQ_SIZE); |
| |
| tx_tid = k_thread_create(&data->tx_thread_data, data->tx_thread_stack, |
| K_KERNEL_STACK_SIZEOF(data->tx_thread_stack), |
| tx_thread, (void *)dev, NULL, NULL, |
| CONFIG_CAN_LOOPBACK_TX_THREAD_PRIORITY, |
| 0, K_NO_WAIT); |
| if (!tx_tid) { |
| LOG_ERR("ERROR spawning tx thread"); |
| return -1; |
| } |
| |
| LOG_INF("Init of %s done", dev->name); |
| |
| return 0; |
| } |
| |
| #define CAN_LOOPBACK_INIT(inst) \ |
| static struct can_loopback_data can_loopback_dev_data_##inst; \ |
| \ |
| DEVICE_DT_INST_DEFINE(inst, &can_loopback_init, NULL, \ |
| &can_loopback_dev_data_##inst, NULL, \ |
| POST_KERNEL, CONFIG_CAN_INIT_PRIORITY, \ |
| &can_loopback_driver_api); |
| |
| DT_INST_FOREACH_STATUS_OKAY(CAN_LOOPBACK_INIT) |