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extcon: arizona: Support direct microphone measurement via HPDET

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With some GPIO control it is possible to detect microphones in a wider
range of configurations by directly measuring the microphone impedance
when the HPDET method cannot distinguish between the behaviour of the
two grounds. Allow a GPIO to be provided in platform data and use it to
implement this behaviour.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Mark Brown
2013-01-11 08:55:54 +09:00
committed by Chanwoo Choi
parent dd235eea4e
commit 1eda6aa7ce
2 changed files with 48 additions and 5 deletions
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3
include/linux/mfd/arizona/pdata.h
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@@ -102,6 +102,9 @@ struct arizona_pdata {
/** Use the headphone detect circuit to identify the accessory */
bool hpdet_acc_id;
/** GPIO used for mic isolation with HPDET */
int hpdet_id_gpio;
/** GPIO for mic detection polarity */
int micd_pol_gpio;