drivers_framework/sample/platform/uart/dispatch/uart_if.c

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 *
 * HDF is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 * See the LICENSE file in the root of this repository for complete details.
 */

#include "uart_if.h"
#include "hdf_log.h"
#include "osal_mem.h"
#include "hdf_io_service_if.h"

#define HDF_LOG_TAG uart_if

struct DevHandle *UartOpen(uint32_t port)
{
    int32_t ret;
    struct DevHandle *handle = NULL;
    char *serviceName = NULL;

    handle = (struct DevHandle *)OsalMemCalloc(sizeof(struct DevHandle));
    if (handle == NULL) {
        HDF_LOGE("Failed to OsalMemCalloc handle");
        return NULL;
    }

    serviceName = (char *)OsalMemCalloc(sizeof(char) * (MAX_DEV_NAME_SIZE + 1));
    if (serviceName == NULL) {
        HDF_LOGE("Failed to OsalMemCalloc serviceName");
        OsalMemFree(handle);
        return NULL;
    }
    ret = snprintf_s(serviceName, MAX_DEV_NAME_SIZE + 1, MAX_DEV_NAME_SIZE, UART_DEV_SERVICE_NAME_PREFIX, port);
    if (ret < 0) {
        HDF_LOGE("Failed to snprintf_s");
        OsalMemFree(handle);
        OsalMemFree(serviceName);
        return NULL;
    }

    struct HdfIoService *service = HdfIoServiceBind(serviceName);
    if (service == NULL) {
        HDF_LOGE("Failed to get service %s", serviceName);
        OsalMemFree(handle);
        OsalMemFree(serviceName);
        return NULL;
    }
    OsalMemFree(serviceName);
    handle->object = service;
    return handle;
}

int32_t UartWrite(struct DevHandle *handle, uint8_t *data, uint32_t size)
{
    int ret;
    struct HdfIoService *service = NULL;

    if (handle == NULL || handle->object == NULL) {
        HDF_LOGE("handle or handle->object is NULL");
        return HDF_FAILURE;
    }

    struct HdfSBuf *sBuf = HdfSbufObtainDefaultSize();
    if (sBuf == NULL) {
        HDF_LOGE("Failed to obtain sBuf");
        return HDF_FAILURE;
    }

    if (!HdfSbufWriteBuffer(sBuf, data, size)) {
        HDF_LOGE("Failed to write sbuf");
        HdfSbufRecycle(sBuf);
        return HDF_FAILURE;
    }

    service = (struct HdfIoService *)handle->object;
    ret = service->dispatcher->Dispatch(&service->object, UART_WRITE, sBuf, NULL);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("Failed to send service call");
    }
    HdfSbufRecycle(sBuf);
    return ret;
}

void UartClose(struct DevHandle *handle)
{
    struct HdfIoService *service = NULL;

    if (handle == NULL || handle->object == NULL) {
        HDF_LOGE("handle or handle->object is NULL");
        return;
    }
    service = (struct HdfIoService *)handle->object;
    HdfIoServiceRecycle(service);
    OsalMemFree(handle);
}