715 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			715 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| // SPDX-License-Identifier: GPL-2.0-only
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| /*
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|  * Kunit tests for IIO rescale conversions
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|  *
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|  * Copyright (c) 2021 Liam Beguin <liambeguin@gmail.com>
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|  */
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| 
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| #include <linux/gcd.h>
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| #include <linux/overflow.h>
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| 
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| #include <linux/iio/afe/rescale.h>
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| #include <linux/iio/iio.h>
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| 
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| #include <kunit/test.h>
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| 
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| struct rescale_tc_data {
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| 	const char *name;
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| 
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| 	const s32 numerator;
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| 	const s32 denominator;
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| 	const s32 offset;
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| 
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| 	const int schan_val;
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| 	const int schan_val2;
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| 	const int schan_off;
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| 	const int schan_scale_type;
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| 
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| 	const char *expected;
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| 	const char *expected_off;
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| };
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| 
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| const struct rescale_tc_data scale_cases[] = {
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| 	/*
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| 	 * Typical use cases
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| 	 */
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| 	{
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| 		.name = "typical IIO_VAL_INT, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT,
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| 		.schan_val = 42,
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| 		.expected = "5210.918114143",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_INT, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT,
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| 		.schan_val = 42,
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| 		.expected = "-5210.918114143",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_FRACTIONAL, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 42,
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| 		.schan_val2 = 20,
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| 		.expected = "260.545905707",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_FRACTIONAL, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 42,
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| 		.schan_val2 = 20,
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| 		.expected = "-260.545905707",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_FRACTIONAL_LOG2, positive",
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| 		.numerator = 42,
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| 		.denominator = 53,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 4096,
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| 		.schan_val2 = 16,
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| 		.expected = "0.049528301",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_FRACTIONAL_LOG2, negative",
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| 		.numerator = -42,
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| 		.denominator = 53,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 4096,
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| 		.schan_val2 = 16,
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| 		.expected = "-0.049528301",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_INT_PLUS_NANO, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456,
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| 		.expected = "1240.710106203",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_INT_PLUS_NANO, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456,
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| 		.expected = "-1240.710106203",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_INT_PLUS_MICRO, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 1234,
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| 		.expected = "1240.84789",
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| 	},
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| 	{
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| 		.name = "typical IIO_VAL_INT_PLUS_MICRO, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 1234,
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| 		.expected = "-1240.84789",
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| 	},
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| 	/*
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| 	 * Use cases with small scales involving divisions
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| 	 */
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 261/509 scaled by 90/1373754273",
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| 		.numerator = 261,
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| 		.denominator = 509,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 90,
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| 		.schan_val2 = 1373754273,
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| 		.expected = "0.000000033594",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 90/1373754273 scaled by 261/509",
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| 		.numerator = 90,
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| 		.denominator = 1373754273,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 261,
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| 		.schan_val2 = 509,
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| 		.expected = "0.000000033594",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 760/1373754273 scaled by 427/2727",
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| 		.numerator = 760,
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| 		.denominator = 1373754273,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 427,
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| 		.schan_val2 = 2727,
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| 		.expected = "0.000000086626",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 761/1373754273 scaled by 427/2727",
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| 		.numerator = 761,
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| 		.denominator = 1373754273,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 427,
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| 		.schan_val2 = 2727,
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| 		.expected = "0.000000086740",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 5/32768 scaled by 3/10000",
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| 		.numerator = 5,
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| 		.denominator = 32768,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 3,
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| 		.schan_val2 = 10000,
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| 		.expected = "0.0000000457763671875",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 0 < scale < 1",
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| 		.numerator = 6,
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| 		.denominator = 6,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 1,
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| 		.schan_val2 = 3,
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| 		.expected = "0.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, -1 < scale < 0",
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| 		.numerator = -6,
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| 		.denominator = 6,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 1,
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| 		.schan_val2 = 3,
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| 		.expected = "-0.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, 0 < scale < 2",
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| 		.numerator = 8,
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| 		.denominator = 2,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 1,
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| 		.schan_val2 = 3,
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| 		.expected = "1.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL, -2 < scale < 0",
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| 		.numerator = -8,
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| 		.denominator = 2,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = 1,
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| 		.schan_val2 = 3,
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| 		.expected = "-1.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, 760/32768 scaled by 15/22",
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| 		.numerator = 760,
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| 		.denominator = 32768,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 15,
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| 		.schan_val2 = 22,
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| 		.expected = "0.000000082946",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, 761/32768 scaled by 15/22",
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| 		.numerator = 761,
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| 		.denominator = 32768,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 15,
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| 		.schan_val2 = 22,
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| 		.expected = "0.000000083055",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, 0 < scale < 1",
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| 		.numerator = 16,
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| 		.denominator = 3,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 1,
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| 		.schan_val2 = 4,
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| 		.expected = "0.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, -1 < scale < 0",
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| 		.numerator = -16,
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| 		.denominator = 3,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 1,
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| 		.schan_val2 = 4,
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| 		.expected = "-0.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, 0 < scale < 2",
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| 		.numerator = 8,
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| 		.denominator = 3,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 1,
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| 		.schan_val2 = 1,
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| 		.expected = "1.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_FRACTIONAL_LOG2, -2 < scale < 0",
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| 		.numerator = -8,
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| 		.denominator = 3,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 1,
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| 		.schan_val2 = 1,
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| 		.expected = "-1.3333333333333333",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_INT_PLUS_MICRO, positive",
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| 		.numerator = 1,
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| 		.denominator = 2,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 5,
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| 		.schan_val2 = 1234,
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| 		.expected = "2.500617",
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| 	},
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| 	{
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| 		.name = "small IIO_VAL_INT_PLUS_MICRO, negative",
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| 		.numerator = -1,
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| 		.denominator = 2,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 5,
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| 		.schan_val2 = 1234,
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| 		.expected = "-2.500617",
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| 	},
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| 	/*
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| 	 * INT_PLUS_{MICRO,NANO} positive/negative corner cases
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| 	 */
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| 	{
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| 		.name = "negative IIO_VAL_INT_PLUS_NANO, negative schan",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = -10,
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| 		.schan_val2 = 123456,
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| 		.expected = "-1240.710106203",
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| 	},
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| 	{
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| 		.name = "negative IIO_VAL_INT_PLUS_NANO, both negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = -10,
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| 		.schan_val2 = 123456,
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| 		.expected = "1240.710106203",
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| 	},
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| 	{
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| 		.name = "negative IIO_VAL_INT_PLUS_NANO, 3 negative",
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| 		.numerator = -1000000,
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| 		.denominator = -8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = -10,
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| 		.schan_val2 = 123456,
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| 		.expected = "-1240.710106203",
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| 	},
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| 	{
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| 		.name = "negative IIO_VAL_INT_PLUS_NANO, 4 negative",
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| 		.numerator = -1000000,
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| 		.denominator = -8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = -10,
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| 		.schan_val2 = -123456,
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| 		.expected = "-1240.710106203",
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| 	},
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| 	{
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| 		.name = "negative IIO_VAL_INT_PLUS_NANO, negative, *val = 0",
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| 		.numerator = 1,
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| 		.denominator = -10,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 0,
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| 		.schan_val2 = 123456789,
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| 		.expected = "-0.012345678",
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| 	},
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| 	/*
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| 	 * INT_PLUS_{MICRO,NANO} decimal part overflow
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| 	 */
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "1256.01200856",
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| 	},
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "-1256.01200856",
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| 	},
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_NANO, negative schan",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = -10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "-1256.01200856",
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| 	},
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, positive",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "16557.914267",
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| 	},
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, negative",
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| 		.numerator = -1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = 10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "-16557.914267",
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| 	},
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| 	{
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| 		.name = "decimal overflow IIO_VAL_INT_PLUS_MICRO, negative schan",
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| 		.numerator = 1000000,
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| 		.denominator = 8060,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_MICRO,
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| 		.schan_val = -10,
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| 		.schan_val2 = 123456789,
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| 		.expected = "-16557.914267",
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| 	},
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| 	/*
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| 	 * 32-bit overflow conditions
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| 	 */
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| 	{
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| 		.name = "overflow IIO_VAL_FRACTIONAL, positive",
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| 		.numerator = 2,
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| 		.denominator = 20,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = S32_MAX,
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| 		.schan_val2 = 1,
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| 		.expected = "214748364.7",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_FRACTIONAL, negative",
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| 		.numerator = -2,
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| 		.denominator = 20,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL,
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| 		.schan_val = S32_MAX,
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| 		.schan_val2 = 1,
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| 		.expected = "-214748364.7",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_FRACTIONAL_LOG2, positive",
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| 		.numerator = S32_MAX,
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| 		.denominator = 4096,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = 4096,
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| 		.schan_val2 = 16,
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| 		.expected = "32767.99998474121",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_FRACTIONAL_LOG2, negative",
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| 		.numerator = S32_MAX,
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| 		.denominator = 4096,
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| 		.schan_scale_type = IIO_VAL_FRACTIONAL_LOG2,
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| 		.schan_val = -4096,
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| 		.schan_val2 = 16,
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| 		.expected = "-32767.99998474121",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_INT_PLUS_NANO, positive",
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| 		.numerator = 2,
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| 		.denominator = 20,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = S32_MAX,
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| 		.expected = "1.214748364",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_INT_PLUS_NANO, negative",
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| 		.numerator = -2,
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| 		.denominator = 20,
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| 		.schan_scale_type = IIO_VAL_INT_PLUS_NANO,
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| 		.schan_val = 10,
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| 		.schan_val2 = S32_MAX,
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| 		.expected = "-1.214748364",
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| 	},
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| 	{
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| 		.name = "overflow IIO_VAL_INT_PLUS_NANO, negative schan",
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| 		.numerator = 2,
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| 		.denominator = 20,
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| 		.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",
 | |
| 	},
 | |
| };
 | |
| 
 | |
| 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 <liambeguin@gmail.com>");
 | |
| MODULE_DESCRIPTION("Test IIO rescale conversion functions");
 | |
| MODULE_LICENSE("GPL v2");
 |