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There is no in-kernel function to get the status register of a tty device like the TIOCMGET ioctl returns to userspace. Create a new function, tty_get_tiocm(), to obtain the status register that other portions of the kernel can call if they need this information, and move the existing internal tty_tiocmget() function to use this interface. Signed-off-by: Florian Eckert <fe@dev.tdt.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20231127110311.3583957-2-fe@dev.tdt.de Signed-off-by: Lee Jones <lee@kernel.org>