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iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED 

The previous driver does't apply the necessary scaling to take the
voltage range into account.
We change readback value from raw data to input voltage to fix case
IIO_CHAN_INFO_PROCESSED.

Fixes: ace4cdfe67 ("iio: adc: mt2701: Add Mediatek auxadc driver for mt2701.")
Signed-off-by: Hui Liu <hui.liu@mediatek.com>
Link: https://lore.kernel.org/r/20210926073028.11045-2-hui.liu@mediatek.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Hui Liu 2021-09-26 15:30:28 +08:00 committed by Jonathan Cameron
parent 9da1b86865
commit c2980c64c7
1 changed files with 8 additions and 0 deletions
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8
drivers/iio/adc/mt6577_auxadc.c
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@ -82,6 +82,10 @@ static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
MT6577_AUXADC_CHANNEL(15),
};
/* For Voltage calculation */
#define VOLTAGE_FULL_RANGE 1500 /* VA voltage */
#define AUXADC_PRECISE 4096 /* 12 bits */
static int mt_auxadc_get_cali_data(int rawdata, bool enable_cali)
{
return rawdata;
@ -191,6 +195,10 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
}
if (adc_dev->dev_comp->sample_data_cali)
*val = mt_auxadc_get_cali_data(*val, true);
/* Convert adc raw data to voltage: 0 - 1500 mV */
*val = *val * VOLTAGE_FULL_RANGE / AUXADC_PRECISE;
return IIO_VAL_INT;
default: