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static int if_open(struct tty_struct *tty, struct file *filp);
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static void if_close(struct tty_struct *tty, struct file *filp);
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unsigned int cmd, unsigned long arg);
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static int if_write_room(struct tty_struct *tty);
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static int if_chars_in_buffer(struct tty_struct *tty);
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static void if_throttle(struct tty_struct *tty);
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static void if_unthrottle(struct tty_struct *tty);
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static void if_set_termios(struct tty_struct *tty, struct ktermios *old);
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unsigned int set, unsigned int clear);
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128
static int if_write(struct tty_struct *tty,
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const unsigned char *buf, int count);