static void ghost_load_firmware_callback(const struct firmware *fw, void *context)
{
    if(fw){
        printk("firmware size=%d\n", fw->size);
        
    }else{
        printk("failed to load firmware\n");
    }
}

void ghost_load_firmware(char *name)
{
    int error;
    error = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, name, &(ghost.client->dev), NULL, GFP_KERNEL, ghost_load_firmware_callback);
    if(error){
        printk("failed to request %s\n", name);
    }
    printk("request firmware %s\n", name);
}