linux-kernel - [PATCH] power: max17042: bugfix of incorrect voltage register value interpretation.

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Message-id: <1313543914-19992-1-git-send-email-myungjoo.ham@samsung.com>
Date:	Wed, 17 Aug 2011 10:18:34 +0900
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Anton Vorontsov <cbouatmailru@...il.com>,
	Philip Rakity <prakity@...vell.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Wolfram Sang <w.sang@...gutronix.de>, myungjoo.ham@...il.com,
	dg77.kim@...sung.com
Subject: [PATCH] power: max17042: bugfix of incorrect voltage register value
 interpretation.

The calculation had error in getting voltage values from
MAX17042 registers. The least bit denotes 78.125uV (625/8).

Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Philip Rakity <prakity@...vell.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/power/max17042_battery.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 61fb6d7..a6dc9c7 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -111,12 +111,12 @@ static int max17042_get_property(struct power_supply *psy,
 		val->intval *= 10000; /* Units of LSB = 10mV */
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
-		val->intval = max17042_read_reg(chip->client,
-				MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
+		val->intval = max17042_read_reg(chip->client, MAX17042_VCELL)
+			    * 625 / 8;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
-		val->intval = max17042_read_reg(chip->client,
-				MAX17042_AvgVCELL) * 83;
+		val->intval = max17042_read_reg(chip->client, MAX17042_AvgVCELL)
+			    * 625 / 8;
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
 		val->intval = max17042_read_reg(chip->client,
-- 
1.7.4.1

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