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iio: core: Add IIO_COVERAGE channel type

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Add a new channel type for sensors that report fractional coverage as
a percentage. The sysfs attribute is in_coverageY_raw; after applying
in_coverageY_scale the value is in percent. The first user is the
ADT7604 leak detector, where the value represents the portion of the
sensing element that is wetted.

Signed-off-by: Liviu Stan <liviu.stan@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Liviu Stan 2026-05-25 19:39:34 +03:00 committed by Jonathan Cameron
parent b46696afbc
commit 622775dbc5
4 changed files with 21 additions and 0 deletions
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17
Documentation/ABI/testing/sysfs-bus-iio
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@ -1980,6 +1980,23 @@ Description:
Raw (unscaled no offset etc.) resistance reading.
Units after application of scale and offset are ohms.
What: /sys/bus/iio/devices/iio:deviceX/in_coverageY_raw
KernelVersion: 7.2
Contact: linux-iio@vger.kernel.org
Description:
Raw (unscaled no offset etc.) coverage reading. Used for sensors
that report fractional coverage as a percentage, such as leak
detectors where the value represents what portion of the sensing
element is wetted. Units after application of scale and offset are
percent.
What: /sys/bus/iio/devices/iio:deviceX/in_coverageY_scale
KernelVersion: 7.2
Contact: linux-iio@vger.kernel.org
Description:
Scale to be applied to in_coverageY_raw to obtain coverage
in percent.
What: /sys/bus/iio/devices/iio:deviceX/heater_enable
KernelVersion: 4.1.0
Contact: linux-iio@vger.kernel.org

1
drivers/iio/industrialio-core.c
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@ -98,6 +98,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_CHROMATICITY] = "chromaticity",
[IIO_ATTENTION] = "attention",
[IIO_ALTCURRENT] = "altcurrent",
[IIO_COVERAGE] = "coverage",
};
static const char * const iio_modifier_names[] = {

1
include/uapi/linux/iio/types.h
View File

@ -53,6 +53,7 @@ enum iio_chan_type {
IIO_CHROMATICITY,
IIO_ATTENTION,
IIO_ALTCURRENT,
IIO_COVERAGE,
};
enum iio_modifier {

2
tools/iio/iio_event_monitor.c
View File

@ -65,6 +65,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_CHROMATICITY] = "chromaticity",
[IIO_ATTENTION] = "attention",
[IIO_ALTCURRENT] = "altcurrent",
[IIO_COVERAGE] = "coverage",
};
static const char * const iio_ev_type_text[] = {
@ -194,6 +195,7 @@ static bool event_is_known(struct iio_event_data *event)
case IIO_CHROMATICITY:
case IIO_ATTENTION:
case IIO_ALTCURRENT:
case IIO_COVERAGE:
break;
default:
return false;