From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
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: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/staging/iio/cdc/ad7150.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
index 97689625f26c..a2aae370c231 100644
--- a/drivers/staging/iio/cdc/ad7150.c
+++ b/drivers/staging/iio/cdc/ad7150.c
@@ -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),\
}
--
2.30.0
