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struct usb_serial_port *port,
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const unsigned char *buf, int count);
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static int whiteheat_write_room(struct tty_struct *tty);
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unsigned int cmd, unsigned long arg);
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static void whiteheat_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old);
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unsigned int set, unsigned int clear);
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static void whiteheat_break_ctl(struct tty_struct *tty, int break_state);
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static int whiteheat_chars_in_buffer(struct tty_struct *tty);