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Commit bc7c49bc authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio:ad5421: Report scale as fractional value 



Move the complexity of calculating the fixed point scale to the core.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 4f2c1885

drivers/iio/dac/ad5421.c

+5 −11
Original line number Original line Diff line number Diff line
@@ -281,18 +281,11 @@ static inline unsigned int ad5421_get_offset(struct ad5421_state *st) 
	return (min * (1 << 16)) / (max - min);

	return (min * (1 << 16)) / (max - min);

}

}





static inline unsigned int ad5421_get_scale(struct ad5421_state *st)

{

	unsigned int min, max;



	ad5421_get_current_min_max(st, &min, &max);

	return ((max - min) * 1000) / (1 << 16);

}



static int ad5421_read_raw(struct iio_dev *indio_dev,

static int ad5421_read_raw(struct iio_dev *indio_dev,

	struct iio_chan_spec const *chan, int *val, int *val2, long m)

	struct iio_chan_spec const *chan, int *val, int *val2, long m)

{

{

	struct ad5421_state *st = iio_priv(indio_dev);

	struct ad5421_state *st = iio_priv(indio_dev);

	unsigned int min, max;

	int ret;

	int ret;





	if (chan->type != IIO_CURRENT)

	if (chan->type != IIO_CURRENT)
@@ -306,9 +299,10 @@ static int ad5421_read_raw(struct iio_dev *indio_dev, 
		*val = ret;

		*val = ret;

		return IIO_VAL_INT;

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		ad5421_get_current_min_max(st, &min, &max);

		*val2 = ad5421_get_scale(st);

		*val = max - min;

		return IIO_VAL_INT_PLUS_MICRO;

		*val2 = (1 << 16) * 1000;

		return IIO_VAL_FRACTIONAL;

	case IIO_CHAN_INFO_OFFSET:

	case IIO_CHAN_INFO_OFFSET:

		*val = ad5421_get_offset(st);

		*val = ad5421_get_offset(st);

		return IIO_VAL_INT;

		return IIO_VAL_INT;