tree 480bab4b0b6197dfc210e5d463a04d8ffa218b8b
parent b2dfc26ff6837af8e334bb9c6f769cb6e0f6a86c
author Joonwoo Park <joonwoop@codeaurora.org> 1369772045 -0700
committer Joonwoo Park <joonwoop@codeaurora.org> 1372704668 -0700

ASoC: wcd9xxx: introduce headphone impedance detection support

Different headphones have different impedance that results in volume level
difference on ears as lower impedance headphone will have higher
volume with the same gain on PAs.
Provide impedance of headphones to be able to adjust gain according to
impedance so user can have consistent volume level with different
headphones.

Change-Id: I707f34344cd0068507bdd8a0192eb7afea1147f2
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>