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iio: test: Add KUnit tests for iio_multiply_value() 

Add KUnit tests for iio_multiply_value().

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250831104825.15097-6-hansg@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
pull/1354/merge
Hans de Goede 2025-08-31 12:48:24 +02:00 committed by Jonathan Cameron
parent 05f958d003
commit c732e60ee1
3 changed files with 225 additions and 0 deletions
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12
drivers/iio/test/Kconfig
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@ -41,3 +41,15 @@ config IIO_FORMAT_KUNIT_TEST
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.
config IIO_MULTIPLY_KUNIT_TEST
tristate "Test IIO multiply functions" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
build unit tests for the IIO multiply 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.

1
drivers/iio/test/Makefile
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@ -7,4 +7,5 @@
obj-$(CONFIG_IIO_RESCALE_KUNIT_TEST) += iio-test-rescale.o
obj-$(CONFIG_IIO_FORMAT_KUNIT_TEST) += iio-test-format.o
obj-$(CONFIG_IIO_GTS_KUNIT_TEST) += iio-test-gts.o
obj-$(CONFIG_IIO_MULTIPLY_KUNIT_TEST) += iio-test-multiply.o
CFLAGS_iio-test-format.o += $(DISABLE_STRUCTLEAK_PLUGIN)

212
drivers/iio/test/iio-test-multiply.c Normal file
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@ -0,0 +1,212 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Unit tests for IIO multiply functions
*
* Copyright (c) 2025 Hans de Goede <hans@hansg.org>
* Based on iio-test-format.c which is:
* Copyright (c) 2020 Lars-Peter Clausen <lars@metafoo.de>
*/
#include <kunit/test.h>
#include <linux/iio/consumer.h>
#include <linux/math64.h>
#include <linux/types.h>
static void __iio_test_iio_multiply_value_integer(struct kunit *test, s64 multiplier)
{
int ret, result, val;
val = 42;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT, val, 0);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, multiplier * val);
val = -23;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT, val, 0);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, multiplier * val);
val = 0;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT, val, 0);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, multiplier * val);
}
static void iio_test_iio_multiply_value_integer(struct kunit *test)
{
__iio_test_iio_multiply_value_integer(test, 20);
__iio_test_iio_multiply_value_integer(test, -20);
}
static void __iio_test_iio_multiply_value_fixedpoint(struct kunit *test, s64 multiplier)
{
int ret, result, val, val2;
/* positive >= 1 (1.5) */
val = 1;
val2 = 500000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_MICRO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * 15, 10));
val = 1;
val2 = 500000000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_NANO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * 15, 10));
/* positive < 1 (0.5) */
val = 0;
val2 = 500000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_MICRO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * 5, 10));
val = 0;
val2 = 500000000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_NANO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * 5, 10));
/* negative <= -1 (-1.5) */
val = -1;
val2 = 500000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_MICRO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * -15, 10));
val = -1;
val2 = 500000000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_NANO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * -15, 10));
/* negative > -1 (-0.5) */
val = 0;
val2 = -500000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_MICRO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * -5, 10));
val = 0;
val2 = -500000000;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_INT_PLUS_NANO, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * -5, 10));
}
static void iio_test_iio_multiply_value_fixedpoint(struct kunit *test)
{
__iio_test_iio_multiply_value_fixedpoint(test, 20);
__iio_test_iio_multiply_value_fixedpoint(test, -20);
}
static void __iio_test_iio_multiply_value_fractional(struct kunit *test, s64 multiplier)
{
int ret, result, val, val2;
/* positive < 1 (1/10)*/
val = 1;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * val, val2));
/* positive >= 1 (100/3)*/
val = 100;
val2 = 3;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * val, val2));
/* negative > -1 (-1/10) */
val = -1;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * val, val2));
/* negative <= -1 (-200/3)*/
val = -200;
val2 = 3;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * val, val2));
/* Zero (0/-10) */
val = 0;
val2 = -10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, div_s64(multiplier * val, val2));
}
static void iio_test_iio_multiply_value_fractional(struct kunit *test)
{
__iio_test_iio_multiply_value_fractional(test, 20);
__iio_test_iio_multiply_value_fractional(test, -20);
}
static void __iio_test_iio_multiply_value_fractional_log2(struct kunit *test, s64 multiplier)
{
int ret, result, val, val2;
/* positive < 1 (123/1024) */
val = 123;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL_LOG2, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, (multiplier * val) >> val2);
/* positive >= 1 (1234567/1024) */
val = 1234567;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL_LOG2, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, (multiplier * val) >> val2);
/* negative > -1 (-123/1024) */
val = -123;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL_LOG2, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, (multiplier * val) >> val2);
/* negative <= -1 (-1234567/1024) */
val = -1234567;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL_LOG2, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, (multiplier * val) >> val2);
/* Zero (0/1024) */
val = 0;
val2 = 10;
ret = iio_multiply_value(&result, multiplier, IIO_VAL_FRACTIONAL_LOG2, val, val2);
KUNIT_EXPECT_EQ(test, ret, IIO_VAL_INT);
KUNIT_EXPECT_EQ(test, result, (multiplier * val) >> val2);
}
static void iio_test_iio_multiply_value_fractional_log2(struct kunit *test)
{
__iio_test_iio_multiply_value_fractional_log2(test, 20);
__iio_test_iio_multiply_value_fractional_log2(test, -20);
}
static struct kunit_case iio_multiply_test_cases[] = {
KUNIT_CASE(iio_test_iio_multiply_value_integer),
KUNIT_CASE(iio_test_iio_multiply_value_fixedpoint),
KUNIT_CASE(iio_test_iio_multiply_value_fractional),
KUNIT_CASE(iio_test_iio_multiply_value_fractional_log2),
{ }
};
static struct kunit_suite iio_multiply_test_suite = {
.name = "iio-multiply",
.test_cases = iio_multiply_test_cases,
};
kunit_test_suite(iio_multiply_test_suite);
MODULE_AUTHOR("Hans de Goede <hans@hansg.org>");
MODULE_DESCRIPTION("Test IIO multiply functions");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("IIO_UNIT_TEST");