// SPDX-License-Identifier: GPL-2.0-only /* * Kunit tests for IIO rescale conversions * * Copyright (c) 2021 Liam Beguin */ #include #include #include #include #include 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 "); MODULE_DESCRIPTION("Test IIO rescale conversion functions"); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS("IIO_RESCALE");