common.h

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/*
 * Copyright (c) 2025 Embeint Holdings Pty Ltd
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#include <stdint.h>
 
#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/modem/pipe.h>
#include <zephyr/sys/ring_buffer.h>
 
struct modem_backend_common {
        /* Pointer to data ready pin configuration */
        const struct gpio_dt_spec *data_ready;
        /* Communication pipe */
        struct modem_pipe pipe;
        /* Ring buffer for holding pipe data stream */
        struct ring_buf pipe_ring_buf;
        /* Worker that reads the FIFO */
        struct k_work_delayable fifo_read;
        /* Signal to notify when FIFO read completes */
        struct k_poll_signal read_result;
        /* Callback for data ready GPIO */
        struct gpio_callback data_ready_cb;
        /* Bus (RTIO SQE) contention semaphore */
        struct k_sem bus_sem;
        /* Duration between polls */
        k_timeout_t poll_period;
        /* Number of bytes pending on FIFO */
        uint16_t bytes_pending;
        /* Internal state flags */
        uint8_t flags;
        /* Backing memory for pipe data stream */
        uint8_t pipe_memory[CONFIG_GNSS_U_BLOX_PIPE_SIZE];
};