linux-kernel - [PATCH 4/7] extcon: arizona: No need to switch back down HPDET ranges

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Message-Id: <1384365877-12355-4-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Wed, 13 Nov 2013 18:04:34 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	cw00.choi@...sung.com
Cc:	myungjoo.ham@...sung.com, sameo@...ux.intel.com,
	lee.jones@...aro.org, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Subject: [PATCH 4/7] extcon: arizona: No need to switch back down HPDET ranges

No point in revisiting ranges the detection will be no more accurate
the second time simply report that the resistance is right on the
range boundry.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/extcon/extcon-arizona.c |   21 +++++++--------------
 1 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 1bae23e..e311c52 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -441,20 +441,7 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
 		range = (range & ARIZONA_HP_IMPEDANCE_RANGE_MASK)
 			   >> ARIZONA_HP_IMPEDANCE_RANGE_SHIFT;
 
-		/* Skip up or down a range? */
-		if (range && (val < arizona_hpdet_c_ranges[range].min)) {
-			range--;
-			dev_dbg(arizona->dev, "Moving to HPDET range %d-%d\n",
-				arizona_hpdet_c_ranges[range].min,
-				arizona_hpdet_c_ranges[range].max);
-			regmap_update_bits(arizona->regmap,
-					   ARIZONA_HEADPHONE_DETECT_1,
-					   ARIZONA_HP_IMPEDANCE_RANGE_MASK,
-					   range <<
-					   ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
-			return -EAGAIN;
-		}
-
+		/* Skip up a range, or report? */
 		if (range < ARRAY_SIZE(arizona_hpdet_c_ranges) - 1 &&
 		    (val >= arizona_hpdet_c_ranges[range].max)) {
 			range++;
@@ -468,6 +455,12 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
 					   ARIZONA_HP_IMPEDANCE_RANGE_SHIFT);
 			return -EAGAIN;
 		}
+
+		if (range && (val < arizona_hpdet_c_ranges[range].min)) {
+			dev_dbg(arizona->dev, "Reporting range boundary %d\n",
+				arizona_hpdet_c_ranges[range].min);
+			val = arizona_hpdet_c_ranges[range].min;
+		}
 	}
 
 	dev_dbg(arizona->dev, "HP impedance %d ohms\n", val);
-- 
1.7.2.5

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