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Add dtr_rts tty-port operation which implements proper DTR/RTS handling (e.g. only lower DTR/RTS during shutdown if HUPCL is set). Note that modem-control locking still needs to be added throughout the driver. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>