linux-kernel - [PATCH V1] fix adc to voltage calculation in da9052 power driver

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Date:	Wed, 18 Dec 2013 15:21:13 +0000
From:	Anthony Olech <anthony.olech.opensource@...semi.com>
To:	Anton Vorontsov <anton@...msg.org>,
	David Woodhouse <dwmw2@...radead.org>
CC:	"open list:HARDWARE MONITORING" <lm-sensors@...sensors.org>,
	open list <linux-kernel@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>
Subject: [PATCH V1] fix adc to voltage calculation in da9052 power driver

The ADC resolution of the PMIC is 10-bits, this means that the maximum
possible value is 1023 and not the 1024 as in the code.

Signed-off-by: Anthony Olech <anthony.olech.opensource@...semi.com>
---
This patch is relative to linux-next repository tag next-20131218

 drivers/power/da9052-battery.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/da9052-battery.c b/drivers/power/da9052-battery.c
index f8f4c0f..8f0f259 100644
--- a/drivers/power/da9052-battery.c
+++ b/drivers/power/da9052-battery.c
@@ -178,7 +178,7 @@ struct da9052_battery {
 
 static inline int volt_reg_to_mV(int value)
 {
-	return ((value * 1000) / 512) + 2500;
+	return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
 }
 
 static inline int ichg_reg_to_mA(int value)
-- 
end-of-patch for fix adc to voltage calculation in da9052 power driver V1

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