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Commit 3c00d932 authored by Hui Liu's avatar Hui Liu Committed by Greg Kroah-Hartman
Browse files

iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED 



commit c2980c64c7fd4585d684574c92d1624d44961edd upstream.

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: ace4cdfe ("iio: adc: mt2701: Add Mediatek auxadc driver for mt2701.")
Signed-off-by: default avatarHui 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: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cf4b3990

drivers/iio/adc/mt6577_auxadc.c

+8 −0
Original line number Diff line number Diff line
@@ -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: