Function rt_device_close

components/drivers/core/device.c:292–319

* @brief This function will close a device. * * @param dev is the pointer of device driver structure. * * @return the result, RT_EOK on successfully. */

 * @return the result, RT_EOK on successfully.
 */
rt_err_t rt_device_close(rt_device_t dev)
{
    rt_err_t result = RT_EOK;

    /* parameter check */
    RT_ASSERT(dev != RT_NULL);
    RT_ASSERT(rt_object_get_type(&dev->parent) == RT_Object_Class_Device);

    if (dev->ref_count == 0)
        return -RT_ERROR;

    dev->ref_count--;

    if (dev->ref_count != 0)
        return RT_EOK;

    /* call device_close interface */
    if (device_close != RT_NULL)
    {
        result = device_close(dev);
    }

    /* set open flag */
    if (result == RT_EOK || result == -RT_ENOSYS)
        dev->open_flag = RT_DEVICE_OFLAG_CLOSE;

    return result;
}
RTM_EXPORT(rt_device_close);

/**