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This patch adds support to Headset JACK, also provides board specific vref ranges for mbhc buttons to be detected. This headset supports both 3 pole and 4 pole headset type and 5 buttons. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>