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-rw-r--r--drivers/iio/test/Kconfig12
-rw-r--r--drivers/iio/test/Makefile1
-rw-r--r--drivers/iio/test/iio-test-multiply.c212
3 files changed, 225 insertions, 0 deletions
diff --git a/drivers/iio/test/Kconfig b/drivers/iio/test/Kconfig
index 7a181cac3cc9..6e65e929791c 100644
--- a/drivers/iio/test/Kconfig
+++ b/drivers/iio/test/Kconfig
@@ -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.
diff --git a/drivers/iio/test/Makefile b/drivers/iio/test/Makefile
index e9a4cf1ff57f..0c846bc21acd 100644
--- a/drivers/iio/test/Makefile
+++ b/drivers/iio/test/Makefile
@@ -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)
diff --git a/drivers/iio/test/iio-test-multiply.c b/drivers/iio/test/iio-test-multiply.c
new file mode 100644
index 000000000000..432e279ffe5b
--- /dev/null
+++ b/drivers/iio/test/iio-test-multiply.c
@@ -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");
generated by cgit (git 2.34.1) at 2025-10-06 00:38:38 +0000