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hwmon: (ina2xx) use DIV_ROUND_CLOSEST() to avoid rounding errors

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Use DIV_ROUND_CLOSEST() when dealing with the calibration values to make the
calculations less error prone.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Bartosz Golaszewski 2015-01-12 14:47:22 +01:00 committed by Guenter Roeck
parent 71eb7c4c7e
commit b721fe2a3a
1 changed files with 7 additions and 3 deletions
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10
drivers/hwmon/ina2xx.c
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@ -186,8 +186,11 @@ static void ina226_set_update_interval(struct ina2xx_data *data)
static int ina2xx_calibrate(struct ina2xx_data *data) static int ina2xx_calibrate(struct ina2xx_data *data)
{ {
return i2c_smbus_write_word_swapped(data->client, INA2XX_CALIBRATION, u16 val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
data->config->calibration_factor / data->rshunt); 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]; val = (s16)data->regs[reg];
break; break;
case INA2XX_CALIBRATION: case INA2XX_CALIBRATION:
val = data->config->calibration_factor / data->regs[reg]; val = DIV_ROUND_CLOSEST(data->config->calibration_factor,
data->regs[reg]);
break; break;
default: default:
/* programmer goofed */ /* programmer goofed */