commit bf87ade0dd7f8cf19dac4d3161d5e86abe0c062b upstream.

Added the ability to detect the ELAN0621 touchpad found in some Lenovo
laptops.
Signed-off-by: NAdam Wong <adam@adamwong.me>
Cc: stable@vger.kernel.org
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>