linux/drivers/iio/test/Kconfig
Matti Vaittinen cf996f0396 iio: test: test gain-time-scale helpers
Some light sensors can adjust both the HW-gain and integration time.
There are cases where adjusting the integration time has similar impact
to the scale of the reported values as gain setting has.

IIO users do typically expect to handle scale by a single writable 'scale'
entry. Driver should then adjust the gain/time accordingly.

It however is difficult for a driver to know whether it should change
gain or integration time to meet the requested scale. Usually it is
preferred to have longer integration time which usually improves
accuracy, but there may be use-cases where long measurement times can be
an issue. Thus it can be preferable to allow also changing the
integration time - but mitigate the scale impact by also changing the gain
underneath. Eg, if integration time change doubles the measured values,
the driver can reduce the HW-gain to half.

The theory of the computations of gain-time-scale is simple. However,
some people (undersigned) got that implemented wrong for more than once.
Hence some gain-time-scale helpers were introduced.

Add some simple tests to verify the most hairy functions.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/0f7505b43f91394dc3bb636369489c897b7e01a7.1705328293.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2024-02-17 16:16:09 +00:00

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# SPDX-License-Identifier: GPL-2.0-only
#
# Industrial I/O subsystem unit tests configuration
#
# Keep in alphabetical order
config IIO_GTS_KUNIT_TEST
tristate "Test IIO formatting functions" if !KUNIT_ALL_TESTS
depends on KUNIT
select IIO_GTS_HELPER
select TEST_KUNIT_DEVICE_HELPERS
default KUNIT_ALL_TESTS
help
build unit tests for the IIO light sensor gain-time-scale helpers.
For more information on KUnit and unit tests in general, please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N. Keep in alphabetical order
config IIO_RESCALE_KUNIT_TEST
tristate "Test IIO rescale conversion functions" if !KUNIT_ALL_TESTS
depends on KUNIT && IIO_RESCALE
default KUNIT_ALL_TESTS
help
Build unit tests for the iio-rescale code.
For more information on KUnit and unit tests in general, please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.
config IIO_FORMAT_KUNIT_TEST
tristate "Test IIO formatting functions" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
build unit tests for the IIO formatting functions.
For more information on KUnit and unit tests in general, please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.