| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* Copyright (C) 2020 ROHM Semiconductors */ |
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| 3 | |
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| 4 | #ifndef LINEAR_RANGE_H |
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| 5 | #define LINEAR_RANGE_H |
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| 6 | |
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| 7 | #include <linux/types.h> |
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| 8 | |
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| 9 | /** |
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| 10 | * struct linear_range - table of selector - value pairs |
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| 11 | * |
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| 12 | * Define a lookup-table for range of values. Intended to help when looking |
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| 13 | * for a register value matching certaing physical measure (like voltage). |
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| 14 | * Usable when increment of one in register always results a constant increment |
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| 15 | * of the physical measure (like voltage). |
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| 16 | * |
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| 17 | * @min: Lowest value in range |
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| 18 | * @min_sel: Lowest selector for range |
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| 19 | * @max_sel: Highest selector for range |
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| 20 | * @step: Value step size |
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| 21 | */ |
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| 22 | struct linear_range { |
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| 23 | unsigned int min; |
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| 24 | unsigned int min_sel; |
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| 25 | unsigned int max_sel; |
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| 26 | unsigned int step; |
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| 27 | }; |
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| 28 | |
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| 29 | #define LINEAR_RANGE(_min, _min_sel, _max_sel, _step) \ |
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| 30 | { \ |
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| 31 | .min = _min, \ |
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| 32 | .min_sel = _min_sel, \ |
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| 33 | .max_sel = _max_sel, \ |
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| 34 | .step = _step, \ |
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| 35 | } |
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| 36 | |
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| 37 | #define LINEAR_RANGE_IDX(_idx, _min, _min_sel, _max_sel, _step) \ |
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| 38 | [_idx] = LINEAR_RANGE(_min, _min_sel, _max_sel, _step) |
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| 39 | |
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| 40 | unsigned int linear_range_values_in_range(const struct linear_range *r); |
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| 41 | unsigned int linear_range_values_in_range_array(const struct linear_range *r, |
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| 42 | int ranges); |
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| 43 | unsigned int linear_range_get_max_value(const struct linear_range *r); |
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| 44 | |
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| 45 | int linear_range_get_value(const struct linear_range *r, unsigned int selector, |
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| 46 | unsigned int *val); |
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| 47 | int linear_range_get_value_array(const struct linear_range *r, int ranges, |
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| 48 | unsigned int selector, unsigned int *val); |
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| 49 | int linear_range_get_selector_low(const struct linear_range *r, |
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| 50 | unsigned int val, unsigned int *selector, |
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| 51 | bool *found); |
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| 52 | int linear_range_get_selector_high(const struct linear_range *r, |
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| 53 | unsigned int val, unsigned int *selector, |
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| 54 | bool *found); |
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| 55 | void linear_range_get_selector_within(const struct linear_range *r, |
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| 56 | unsigned int val, unsigned int *selector); |
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| 57 | int linear_range_get_selector_low_array(const struct linear_range *r, |
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| 58 | int ranges, unsigned int val, |
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| 59 | unsigned int *selector, bool *found); |
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| 60 | |
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| 61 | #endif |
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| 62 | |
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