From b721fe2a3a92b896ba1b41e338471dfef672052a Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Mon, 12 Jan 2015 14:47:22 +0100 Subject: [PATCH] hwmon: (ina2xx) use DIV_ROUND_CLOSEST() to avoid rounding errors Use DIV_ROUND_CLOSEST() when dealing with the calibration values to make the calculations less error prone. Signed-off-by: Bartosz Golaszewski Signed-off-by: Guenter Roeck --- drivers/hwmon/ina2xx.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index ae110c5386ae..611ec4edd979 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -186,8 +186,11 @@ static void ina226_set_update_interval(struct ina2xx_data *data) static int ina2xx_calibrate(struct ina2xx_data *data) { - return i2c_smbus_write_word_swapped(data->client, INA2XX_CALIBRATION, - data->config->calibration_factor / data->rshunt); + u16 val = DIV_ROUND_CLOSEST(data->config->calibration_factor, + data->rshunt); + + return i2c_smbus_write_word_swapped(data->client, + INA2XX_CALIBRATION, val); } /* @@ -307,7 +310,8 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg) val = (s16)data->regs[reg]; break; case INA2XX_CALIBRATION: - val = data->config->calibration_factor / data->regs[reg]; + val = DIV_ROUND_CLOSEST(data->config->calibration_factor, + data->regs[reg]); break; default: /* programmer goofed */ -- 2.20.1