diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2015-01-12 14:47:22 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-01-25 21:23:59 -0800 |
| commit | b721fe2a3a92b896ba1b41e338471dfef672052a (patch) | |
| tree | d982f8763a82b764cbe2d62308f7a6a11e4c73f3 /drivers/hwmon | |
| parent | 71eb7c4c7e6219a484c5185919962a99fb0ddabb (diff) | |
| download | linux-b721fe2a3a92b896ba1b41e338471dfef672052a.tar.gz | |
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 <bgolaszewski@baylibre.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/ina2xx.c | 10 |
1 files 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 */ |