From c09088d934c1e1672be8b3cfe3ba4f40ab2bf13e Mon Sep 17 00:00:00 2001
From: Anthony Olech <anthony.olech.opensource@diasemi.com>
Date: Wed, 18 Dec 2013 15:15:31 +0000
Subject: [PATCH] hwmon: (da9052) Fix adc to voltage calculation
The ADC resolution of the PMIC is 10-bits, this means that the maximum
possible value is 1023 and not the 1024 as originally in the code.
Signed-off-by: Anthony Olech <anthony.olech.opensource@diasemi.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/da9052-hwmon.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
index 960fac3fb166..afd31042b452 100644
--- a/drivers/hwmon/da9052-hwmon.c
+++ b/drivers/hwmon/da9052-hwmon.c
@@ -45,7 +45,7 @@ static const char * const input_names[] = {
/* Conversion function for VDDOUT and VBAT */
static inline int volt_reg_to_mv(int value)
{
- return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500;
+ return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
}
/* Conversion function for ADC channels 4, 5 and 6 */
@@ -57,7 +57,7 @@ static inline int input_reg_to_mv(int value)
/* Conversion function for VBBAT */
static inline int vbbat_reg_to_mv(int value)
{
- return DIV_ROUND_CLOSEST(value * 2500, 512);
+ return DIV_ROUND_CLOSEST(value * 5000, 1023);
}
static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
--
2.34.1