diff options
| -rw-r--r-- | drivers/iio/adc/ina2xx-adc.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c index a16f8c6ba744..84a43871f7dc 100644 --- a/drivers/iio/adc/ina2xx-adc.c +++ b/drivers/iio/adc/ina2xx-adc.c @@ -123,7 +123,7 @@ struct ina2xx_chip_info { struct task_struct *task; const struct ina2xx_config *config; struct mutex state_lock; - unsigned int shunt_resistor; + unsigned int shunt_resistor_uohm; int avg; int int_time_vbus; /* Bus voltage integration time uS */ int int_time_vshunt; /* Shunt voltage integration time uS */ @@ -436,7 +436,7 @@ static ssize_t ina2xx_allow_async_readout_store(struct device *dev, /* * Set current LSB to 1mA, shunt is in uOhms * (equation 13 in datasheet). We hardcode a Current_LSB - * of 1.0 x10-6. The only remaining parameter is RShunt. + * of 1.0 x10-3. The only remaining parameter is RShunt. * There is no need to expose the CALIBRATION register * to the user for now. But we need to reset this register * if the user updates RShunt after driver init, e.g upon @@ -445,7 +445,7 @@ static ssize_t ina2xx_allow_async_readout_store(struct device *dev, static int ina2xx_set_calibration(struct ina2xx_chip_info *chip) { u16 regval = DIV_ROUND_CLOSEST(chip->config->calibration_factor, - chip->shunt_resistor); + chip->shunt_resistor_uohm); return regmap_write(chip->regmap, INA2XX_CALIBRATION, regval); } @@ -455,7 +455,7 @@ static int set_shunt_resistor(struct ina2xx_chip_info *chip, unsigned int val) if (val <= 0 || val > chip->config->calibration_factor) return -EINVAL; - chip->shunt_resistor = val; + chip->shunt_resistor_uohm = val; return 0; } @@ -465,8 +465,9 @@ static ssize_t ina2xx_shunt_resistor_show(struct device *dev, char *buf) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); + int vals[2] = { chip->shunt_resistor_uohm, 1000000 }; - return sprintf(buf, "%d\n", chip->shunt_resistor); + return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals); } static ssize_t ina2xx_shunt_resistor_store(struct device *dev, @@ -474,14 +475,13 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev, const char *buf, size_t len) { struct ina2xx_chip_info *chip = iio_priv(dev_to_iio_dev(dev)); - unsigned long val; - int ret; + int val, val_fract, ret; - ret = kstrtoul((const char *) buf, 10, &val); + ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract); if (ret) return ret; - ret = set_shunt_resistor(chip, val); + ret = set_shunt_resistor(chip, val * 1000000 + val_fract); if (ret) return ret; |