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