// SPDX-License-Identifier: GPL-2.0-only
/*
* Kunit tests for IIO rescale conversions
*
* Copyright (c) 2021 Liam Beguin <[email protected]>
*/
#include <linux/gcd.h>
#include <linux/overflow.h>
#include <linux/iio/afe/rescale.h>
#include <linux/iio/iio.h>
#include <kunit/test.h>
struct rescale_tc_data {
const char *name;
const s32 numerator;
const s32 denominator;
const s32 offset;
const int schan_val;
const int schan_val2;
const int schan_off;
const int schan_scale_type;
const char *expected;
const char *expected_off;
};
static const struct rescale_tc_data scale_cases[] = {
/*
* Typical use cases
*/
{
.name = "typical IIO_VAL_INT, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT,
.schan_val = 42,
.expected = "5210.918114143",
},
{
.name = "typical IIO_VAL_INT, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT,
.schan_val = 42,
.expected = "-5210.918114143",
},
{
.name = "typical IIO_VAL_FRACTIONAL, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 42,
.schan_val2 = 20,
.expected = "260.545905707",
},
{
.name = "typical IIO_VAL_FRACTIONAL, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 42,
.schan_val2 = 20,
.expected = "-260.545905707",
},
{
.name = "typical IIO_VAL_FRACTIONAL_LOG2, positive",
.numerator = 42,
.denominator = 53,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 4096,
.schan_val2 = 16,
.expected = "0.049528301",
},
{
.name = "typical IIO_VAL_FRACTIONAL_LOG2, negative",
.numerator = -42,
.denominator = 53,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 4096,
.schan_val2 = 16,
.expected = "-0.049528301",
},
{
.name = "typical IIO_VAL_INT_PLUS_NANO, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456,
.expected = "1240.710106203",
},
{
.name = "typical IIO_VAL_INT_PLUS_NANO, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456,
.expected = "-1240.710106203",
},
{
.name = "typical IIO_VAL_INT_PLUS_MICRO, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 1234,
.expected = "1240.84789",
},
{
.name = "typical IIO_VAL_INT_PLUS_MICRO, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 1234,
.expected = "-1240.84789",
},
/*
* Use cases with small scales involving divisions
*/
{
.name = "small IIO_VAL_FRACTIONAL, 261/509 scaled by 90/1373754273",
.numerator = 261,
.denominator = 509,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 90,
.schan_val2 = 1373754273,
.expected = "0.000000033594",
},
{
.name = "small IIO_VAL_FRACTIONAL, 90/1373754273 scaled by 261/509",
.numerator = 90,
.denominator = 1373754273,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 261,
.schan_val2 = 509,
.expected = "0.000000033594",
},
{
.name = "small IIO_VAL_FRACTIONAL, 760/1373754273 scaled by 427/2727",
.numerator = 760,
.denominator = 1373754273,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 427,
.schan_val2 = 2727,
.expected = "0.000000086626",
},
{
.name = "small IIO_VAL_FRACTIONAL, 761/1373754273 scaled by 427/2727",
.numerator = 761,
.denominator = 1373754273,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 427,
.schan_val2 = 2727,
.expected = "0.000000086740",
},
{
.name = "small IIO_VAL_FRACTIONAL, 5/32768 scaled by 3/10000",
.numerator = 5,
.denominator = 32768,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 3,
.schan_val2 = 10000,
.expected = "0.0000000457763671875",
},
{
.name = "small IIO_VAL_FRACTIONAL, 0 < scale < 1",
.numerator = 6,
.denominator = 6,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 1,
.schan_val2 = 3,
.expected = "0.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL, -1 < scale < 0",
.numerator = -6,
.denominator = 6,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 1,
.schan_val2 = 3,
.expected = "-0.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL, 0 < scale < 2",
.numerator = 8,
.denominator = 2,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 1,
.schan_val2 = 3,
.expected = "1.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL, -2 < scale < 0",
.numerator = -8,
.denominator = 2,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 1,
.schan_val2 = 3,
.expected = "-1.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, 760/32768 scaled by 15/22",
.numerator = 760,
.denominator = 32768,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 15,
.schan_val2 = 22,
.expected = "0.000000082946",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, 761/32768 scaled by 15/22",
.numerator = 761,
.denominator = 32768,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 15,
.schan_val2 = 22,
.expected = "0.000000083055",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, 0 < scale < 1",
.numerator = 16,
.denominator = 3,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 1,
.schan_val2 = 4,
.expected = "0.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, -1 < scale < 0",
.numerator = -16,
.denominator = 3,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 1,
.schan_val2 = 4,
.expected = "-0.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, 0 < scale < 2",
.numerator = 8,
.denominator = 3,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 1,
.schan_val2 = 1,
.expected = "1.3333333333333333",
},
{
.name = "small IIO_VAL_FRACTIONAL_LOG2, -2 < scale < 0",
.numerator = -8,
.denominator = 3,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 1,
.schan_val2 = 1,
.expected = "-1.3333333333333333",
},
{
.name = "small IIO_VAL_INT_PLUS_MICRO, positive",
.numerator = 1,
.denominator = 2,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 5,
.schan_val2 = 1234,
.expected = "2.500617",
},
{
.name = "small IIO_VAL_INT_PLUS_MICRO, negative",
.numerator = -1,
.denominator = 2,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 5,
.schan_val2 = 1234,
.expected = "-2.500617",
},
/*
* INT_PLUS_{MICRO,NANO} positive/negative corner cases
*/
{
.name = "negative IIO_VAL_INT_PLUS_NANO, negative schan",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = 123456,
.expected = "-1240.710106203",
},
{
.name = "negative IIO_VAL_INT_PLUS_NANO, both negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = 123456,
.expected = "1240.710106203",
},
{
.name = "negative IIO_VAL_INT_PLUS_NANO, 3 negative",
.numerator = -1000000,
.denominator = -8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = 123456,
.expected = "-1240.710106203",
},
{
.name = "negative IIO_VAL_INT_PLUS_NANO, 4 negative",
.numerator = -1000000,
.denominator = -8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = -123456,
.expected = "-1240.710106203",
},
{
.name = "negative IIO_VAL_INT_PLUS_NANO, negative, *val = 0",
.numerator = 1,
.denominator = -10,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 0,
.schan_val2 = 123456789,
.expected = "-0.012345678",
},
/*
* INT_PLUS_{MICRO,NANO} decimal part overflow
*/
{
.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456789,
.expected = "1256.01200856",
},
{
.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456789,
.expected = "-1256.01200856",
},
{
.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, negative schan",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = 123456789,
.expected = "-1256.01200856",
},
{
.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, positive",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 123456789,
.expected = "16557.914267",
},
{
.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, negative",
.numerator = -1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 123456789,
.expected = "-16557.914267",
},
{
.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, negative schan",
.numerator = 1000000,
.denominator = 8060,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = -10,
.schan_val2 = 123456789,
.expected = "-16557.914267",
},
/*
* 32-bit overflow conditions
*/
{
.name = "overflow IIO_VAL_FRACTIONAL, positive",
.numerator = 2,
.denominator = 20,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = S32_MAX,
.schan_val2 = 1,
.expected = "214748364.7",
},
{
.name = "overflow IIO_VAL_FRACTIONAL, negative",
.numerator = -2,
.denominator = 20,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = S32_MAX,
.schan_val2 = 1,
.expected = "-214748364.7",
},
{
.name = "overflow IIO_VAL_FRACTIONAL_LOG2, positive",
.numerator = S32_MAX,
.denominator = 4096,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 4096,
.schan_val2 = 16,
.expected = "32767.99998474121",
},
{
.name = "overflow IIO_VAL_FRACTIONAL_LOG2, negative",
.numerator = S32_MAX,
.denominator = 4096,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = -4096,
.schan_val2 = 16,
.expected = "-32767.99998474121",
},
{
.name = "overflow IIO_VAL_INT_PLUS_NANO, positive",
.numerator = 2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = S32_MAX,
.expected = "1.214748364",
},
{
.name = "overflow IIO_VAL_INT_PLUS_NANO, negative",
.numerator = -2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = S32_MAX,
.expected = "-1.214748364",
},
{
.name = "overflow IIO_VAL_INT_PLUS_NANO, negative schan",
.numerator = 2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = -10,
.schan_val2 = S32_MAX,
.expected = "-1.214748364",
},
{
.name = "overflow IIO_VAL_INT_PLUS_MICRO, positive",
.numerator = 2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = S32_MAX,
.expected = "215.748364",
},
{
.name = "overflow IIO_VAL_INT_PLUS_MICRO, negative",
.numerator = -2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = S32_MAX,
.expected = "-215.748364",
},
{
.name = "overflow IIO_VAL_INT_PLUS_MICRO, negative schan",
.numerator = 2,
.denominator = 20,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = -10,
.schan_val2 = S32_MAX,
.expected = "-215.748364",
},
};
static const struct rescale_tc_data offset_cases[] = {
/*
* Typical use cases
*/
{
.name = "typical IIO_VAL_INT, positive",
.offset = 1234,
.schan_scale_type = IIO_VAL_INT,
.schan_val = 123,
.schan_val2 = 0,
.schan_off = 14,
.expected_off = "24", /* 23.872 */
},
{
.name = "typical IIO_VAL_INT, negative",
.offset = -1234,
.schan_scale_type = IIO_VAL_INT,
.schan_val = 12,
.schan_val2 = 0,
.schan_off = 14,
.expected_off = "-88", /* -88.83333333333333 */
},
{
.name = "typical IIO_VAL_FRACTIONAL, positive",
.offset = 1234,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 12,
.schan_val2 = 34,
.schan_off = 14,
.expected_off = "3510", /* 3510.333333333333 */
},
{
.name = "typical IIO_VAL_FRACTIONAL, negative",
.offset = -1234,
.schan_scale_type = IIO_VAL_FRACTIONAL,
.schan_val = 12,
.schan_val2 = 34,
.schan_off = 14,
.expected_off = "-3482", /* -3482.333333333333 */
},
{
.name = "typical IIO_VAL_FRACTIONAL_LOG2, positive",
.offset = 1234,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 12,
.schan_val2 = 16,
.schan_off = 14,
.expected_off = "6739299", /* 6739299.333333333 */
},
{
.name = "typical IIO_VAL_FRACTIONAL_LOG2, negative",
.offset = -1234,
.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
.schan_val = 12,
.schan_val2 = 16,
.schan_off = 14,
.expected_off = "-6739271", /* -6739271.333333333 */
},
{
.name = "typical IIO_VAL_INT_PLUS_NANO, positive",
.offset = 1234,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456789,
.schan_off = 14,
.expected_off = "135", /* 135.8951219647469 */
},
{
.name = "typical IIO_VAL_INT_PLUS_NANO, negative",
.offset = -1234,
.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
.schan_val = 10,
.schan_val2 = 123456789,
.schan_off = 14,
.expected_off = "-107", /* -107.89512196474689 */
},
{
.name = "typical IIO_VAL_INT_PLUS_MICRO, positive",
.offset = 1234,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 123456789,
.schan_off = 14,
.expected_off = "23", /* 23.246438560723952 */
},
{
.name = "typical IIO_VAL_INT_PLUS_MICRO, negative",
.offset = -12345,
.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
.schan_val = 10,
.schan_val2 = 123456789,
.schan_off = 14,
.expected_off = "-78", /* -78.50185091745313 */
},
};
static void case_to_desc(const struct rescale_tc_data *t, char *desc)
{
strcpy(desc, t->name);
}
KUNIT_ARRAY_PARAM(iio_rescale_scale, scale_cases, case_to_desc);
KUNIT_ARRAY_PARAM(iio_rescale_offset, offset_cases, case_to_desc);
/**
* iio_str_to_nano() - Parse a fixed-point string to get an
* IIO_VAL_INT_PLUS_NANO value
* @str: The string to parse
* @nano: The number as an integer
*
* Returns 0 on success, or a negative error code if the string cound not be
* parsed.
*/
static int iio_str_to_nano(const char *str, s64 *nano)
{
int tmp, tmp2;
int ret = 0;
/*
* iio_str_to_fixpoint() uses 10^8 here instead of 10^9 as fract_mult is
* the multiplier for the first decimal place.
*/
ret = iio_str_to_fixpoint(str, 100000000, &tmp, &tmp2);
if (ret < 0)
return ret;
if (tmp < 0)
tmp2 *= -1;
*nano = (s64)tmp * 1000000000UL + tmp2;
return ret;
}
/**
* iio_test_relative_error_ppm() - Compute relative error (in parts-per-million)
* between two fixed-point strings
* @real_str: The real value as a string
* @exp_str: The expected value as a string
*
* Returns a negative error code if the strings cound not be parsed, or the
* relative error in parts-per-million.
*/
static int iio_test_relative_error_ppm(const char *real_str, const char *exp_str)
{
s64 real, exp, err;
int ret;
ret = iio_str_to_nano(real_str, &real);
if (ret < 0)
return ret;
ret = iio_str_to_nano(exp_str, &exp);
if (ret < 0)
return ret;
if (!exp) {
pr_err("Expected value is null, relative error is undefined\n");
return -EINVAL;
}
err = 1000000UL * abs(exp - real);
return (int)div64_u64(err, abs(exp));
}
static void iio_rescale_test_scale(struct kunit *test)
{
struct rescale_tc_data *t = (struct rescale_tc_data *)test->param_value;
char *buff = kunit_kmalloc(test, PAGE_SIZE, GFP_KERNEL);
struct rescale rescale;
int values[2];
int rel_ppm;
int ret;
rescale.numerator = t->numerator;
rescale.denominator = t->denominator;
rescale.offset = t->offset;
values[0] = t->schan_val;
values[1] = t->schan_val2;
ret = rescale_process_scale(&rescale, t->schan_scale_type,
&values[0], &values[1]);
ret = iio_format_value(buff, ret, 2, values);
KUNIT_EXPECT_EQ(test, (int)strlen(buff), ret);
rel_ppm = iio_test_relative_error_ppm(buff, t->expected);
KUNIT_EXPECT_GE_MSG(test, rel_ppm, 0, "failed to compute ppm\n");
KUNIT_EXPECT_EQ_MSG(test, rel_ppm, 0,
"\t real=%s"
"\texpected=%s\n",
buff, t->expected);
}
static void iio_rescale_test_offset(struct kunit *test)
{
struct rescale_tc_data *t = (struct rescale_tc_data *)test->param_value;
char *buff_off = kunit_kmalloc(test, PAGE_SIZE, GFP_KERNEL);
struct rescale rescale;
int values[2];
int ret;
rescale.numerator = t->numerator;
rescale.denominator = t->denominator;
rescale.offset = t->offset;
values[0] = t->schan_val;
values[1] = t->schan_val2;
ret = rescale_process_offset(&rescale, t->schan_scale_type,
t->schan_val, t->schan_val2, t->schan_off,
&values[0], &values[1]);
ret = iio_format_value(buff_off, ret, 2, values);
KUNIT_EXPECT_EQ(test, (int)strlen(buff_off), ret);
KUNIT_EXPECT_STREQ(test, strim(buff_off), t->expected_off);
}
static struct kunit_case iio_rescale_test_cases[] = {
KUNIT_CASE_PARAM(iio_rescale_test_scale, iio_rescale_scale_gen_params),
KUNIT_CASE_PARAM(iio_rescale_test_offset, iio_rescale_offset_gen_params),
{}
};
static struct kunit_suite iio_rescale_test_suite = {
.name = "iio-rescale",
.test_cases = iio_rescale_test_cases,
};
kunit_test_suite(iio_rescale_test_suite);
MODULE_AUTHOR("Liam Beguin <[email protected]>");
MODULE_DESCRIPTION("Test IIO rescale conversion functions");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_RESCALE);
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