iio: chemical: ccs811: Fix output of IIO_CONCENTRATION channels

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commit 8f114acd4e upstream.

in_concentration_raw should report, according to sysfs-bus-iio documentation,
a "Raw (unscaled no offset etc.) percentage reading of a substance."

Modify scale to convert from ppm/ppb to percentage:
1 ppm = 0.0001%
1 ppb = 0.0000001%

There is no offset needed to convert the ppm/ppb to percentage,
so remove offset from IIO_CONCENTRATION (IIO_MOD_CO2) channel.

Cc'd stable to reduce chance of userspace breakage in the long
run as we fix this wrong bit of ABI usage.

Signed-off-by: Narcisa Ana Maria Vasile <narcisaanamaria12@gmail.com>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Narcisa Ana Maria Vasile 2017-12-06 18:57:58 +02:00 • committed by Greg Kroah-Hartman

parent ce868fb5d8

commit b82021cb00

1 changed files with 3 additions and 10 deletions

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drivers/iio/chemical/ccs811.c

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