From e46e2512ac84bd914212dc4b639d596db543f5b1 Mon Sep 17 00:00:00 2001 From: Roan van Dijk Date: Thu, 21 Oct 2021 16:00:18 +0200 Subject: 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 Link: https://lore.kernel.org/r/20211021140018.3051213-1-roan@protonic.nl Signed-off-by: Jonathan Cameron --- drivers/iio/chemical/scd4x.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/iio') diff --git a/drivers/iio/chemical/scd4x.c b/drivers/iio/chemical/scd4x.c index ebebcb117ba2..267bc3c05338 100644 --- a/drivers/iio/chemical/scd4x.c +++ b/drivers/iio/chemical/scd4x.c @@ -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 = { -- cgit v1.2.3