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iio: chemical: scd4x: Add a scale for the co2 concentration reading 

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@protonic.nl>
Link: https://lore.kernel.org/r/20211021140018.3051213-1-roan@protonic.nl
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Roan van Dijk 2021-10-21 16:00:18 +02:00 committed by Jonathan Cameron
parent 392998a803
commit e46e2512ac
1 changed files with 7 additions and 2 deletions
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9
drivers/iio/chemical/scd4x.c
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@ -353,7 +353,11 @@ 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;
@ -503,7 +507,8 @@ 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 = {