[PATCH] iio: chemical: scd4x: Add a scale for the co2 concentration reading
From: Roan van Dijk
Date: Thu Oct 21 2021 - 10:01:01 EST
This patch adds a scale for the co2 concentration reading. The reading is
expressed in percent after applying the scale to the raw value.
Signed-off-by: Roan van Dijk <roan@xxxxxxxxxxx>
---
drivers/iio/chemical/scd4x.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/chemical/scd4x.c b/drivers/iio/chemical/scd4x.c
index 09b34201c42b..b063b378c7d5 100644
--- a/drivers/iio/chemical/scd4x.c
+++ b/drivers/iio/chemical/scd4x.c
@@ -352,7 +352,11 @@ static int scd4x_read_raw(struct iio_dev *indio_dev,
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- if (chan->type == IIO_TEMP) {
+ if (chan->type == IIO_CONCENTRATION) {
+ *val = 0;
+ *val2 = 100;
+ return IIO_VAL_INT_PLUS_MICRO;
+ } else if (chan->type == IIO_TEMP) {
*val = 175000;
*val2 = 65536;
return IIO_VAL_FRACTIONAL;
@@ -501,7 +505,8 @@ static const struct iio_chan_spec scd4x_channels[] = {
.type = IIO_CONCENTRATION,
.channel2 = IIO_MOD_CO2,
.modified = 1,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
.address = SCD4X_CO2,
.scan_index = SCD4X_CO2,
.scan_type = {
--
2.30.2