Commit 18595e71 authored by Jonathan Cameron's avatar Jonathan Cameron
Browse files

staging:iio:cdc:ad7150: Add scale and offset to info_mask_shared_by_type 



The datasheet provides these two values on the assumption they are applied
to unshift raw value.  Hence shift both the offset and scale by 4
to compensate.

Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210314181511.531414-19-jic23@kernel.org
parent f28334fe

drivers/staging/iio/cdc/ad7150.c

+16 −0
Original line number Diff line number Diff line
@@ -121,6 +121,18 @@ static int ad7150_read_raw(struct iio_dev *indio_dev, 
			return ret;

		*val = ret;



		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

		/*

		 * Base units for capacitance are nano farads and the value

		 * calculated from the datasheet formula is in picofarad

		 * so multiply by 1000

		 */

		*val = 1000;

		*val2 = 40944 >> 4; /* To match shift in _RAW */

		return IIO_VAL_FRACTIONAL;

	case IIO_CHAN_INFO_OFFSET:

		*val = -(12288 >> 4); /* To match shift in _RAW */

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SAMP_FREQ:

		/* Strangely same for both 1 and 2 chan parts */
@@ -425,6 +437,8 @@ static const struct iio_event_spec ad7150_events[] = { 
		.channel = _chan,				\

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\

		BIT(IIO_CHAN_INFO_AVERAGE_RAW),			\

		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \

			BIT(IIO_CHAN_INFO_OFFSET),		\

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\

		.event_spec = ad7150_events,			\

		.num_event_specs = ARRAY_SIZE(ad7150_events),	\
@@ -436,6 +450,8 @@ static const struct iio_event_spec ad7150_events[] = { 
		.channel = _chan,				\

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\

		BIT(IIO_CHAN_INFO_AVERAGE_RAW),			\

		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \

			BIT(IIO_CHAN_INFO_OFFSET),		\

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\

	}