linux-kernel - [PATCH 06/16] extcon: arizona: Raise minimum microphone impedance for HPDET method

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Date:	Tue,  2 Apr 2013 12:32:38 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 06/16] extcon: arizona: Raise minimum microphone impedance for HPDET method

Ensure greater reliability by increasing the minimum threashold for
identifying a microphone.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/extcon/extcon-arizona.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 132bc99..2f0bd49 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -519,7 +519,7 @@ static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading)
 		 * measure the mic as high impedance.
 		 */
 		if ((info->hpdet_res[0] > info->hpdet_res[1] * 2) ||
-		    (id_gpio && info->hpdet_res[2] > 10)) {
+		    (id_gpio && info->hpdet_res[2] > 1257)) {
 			dev_dbg(arizona->dev, "Detected mic\n");
 			info->mic = true;
 			info->detecting = true;
-- 
1.7.10.4

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