421 static int pti_tty_driver_open(struct tty_struct *tty, struct file *filp)  in pti_tty_driver_open()  argument
430 	return tty_port_open(tty->port, tty, filp);  in pti_tty_driver_open()
444 static void pti_tty_driver_close(struct tty_struct *tty, struct file *filp)  in pti_tty_driver_close()  argument
446 	tty_port_close(tty->port, tty, filp);  in pti_tty_driver_close()
554 static int pti_char_open(struct inode *inode, struct file *filp)  in pti_char_open()  argument
567 	filp->private_data = mc;  in pti_char_open()
582 static int pti_char_release(struct inode *inode, struct file *filp)  in pti_char_release()  argument
584 	pti_release_masterchannel(filp->private_data);  in pti_char_release()
585 	filp->private_data = NULL;  in pti_char_release()
609 static ssize_t pti_char_write(struct file *filp, const char __user *data,  in pti_char_write()  argument
619 	mc = filp->private_data;  in pti_char_write()