linux内核tty驱动程序你能在代码中默认关闭echo吗？

#include <linux/tty.h>
#include <linux/tty_driver.h>

static void disable_echo(struct tty_struct *tty)
{
    struct ktermios *termios = tty->termios;

    termios->c_lflag &= ~ECHO;
}

static int my_tty_open(struct tty_struct *tty, struct file *file)
{
    disable_echo(tty);
    return 0;
}

static const struct tty_operations my_tty_ops = {
    .open = my_tty_open,
};

static struct tty_driver *my_tty_driver;

static int __init my_tty_init(void)
{
    my_tty_driver = alloc_tty_driver(1);
    my_tty_driver->driver_name = "my_tty";
    my_tty_driver->name = "my_tty";
    my_tty_driver->major = TTY_MAJOR;
    my_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
    my_tty_driver->subtype = SERIAL_TYPE_NORMAL;
    my_tty_driver->init_termios = tty_std_termios;
    my_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
    my_tty_driver->init_termios.c_ispeed = 9600;
    my_tty_driver->init_termios.c_ospeed = 9600;
    tty_set_operations(my_tty_driver, &my_tty_ops);
    tty_register_driver(my_tty_driver);
    return 0;
}

static void __exit my_tty_exit(void)
{
    tty_unregister_driver(my_tty_driver);
    put_tty_driver(my_tty_driver);
}

module_init(my_tty_init);
module_exit(my_tty_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("My TTY Driver");