Commit 3af99354 authored by Miquel Raynal's avatar Miquel Raynal Committed by Lee Jones
Browse files

iio: adc: ti_am335x_adc: Add the scale information 



Without the scale, the values returned to the user are just a picture of
the input voltage against the full scale range of the ADC. We need to
provide the actual conversion factor to get milli-Volts values.

Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Acked-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211015081506.933180-45-miquel.raynal@bootlin.com
parent 789e5ebc

drivers/iio/adc/ti_am335x_adc.c

+18 −0
Original line number Diff line number Diff line
@@ -417,6 +417,7 @@ static int tiadc_channel_init(struct device *dev, struct iio_dev *indio_dev, 
		chan->indexed = 1;

		chan->channel = adc_dev->channel_line[i];

		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);

		chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);

		chan->datasheet_name = chan_name_ain[chan->channel];

		chan->scan_index = i;

		chan->scan_type.sign = 'u';
@@ -441,6 +442,23 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, 
	unsigned long timeout;

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		break;

	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_VOLTAGE:

			*val = 1800;

			*val2 = chan->scan_type.realbits;

			return IIO_VAL_FRACTIONAL_LOG2;

		default:

			return -EINVAL;

		}

		break;

	default:

		return -EINVAL;

	}



	if (iio_buffer_enabled(indio_dev))

		return -EBUSY;