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);}