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linear_range.h
/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (C) 2020 ROHM Semiconductors */ #ifndef LINEAR_RANGE_H #define LINEAR_RANGE_H #include <linux/types.h> /** * struct linear_range - table of selector - value pairs * * Define a lookup-table for range of values. Intended to help when looking * for a register value matching certaing physical measure (like voltage). * Usable when increment of one in register always results a constant increment * of the physical measure (like voltage). * * @min: Lowest value in range * @min_sel: Lowest selector for range * @max_sel: Highest selector for range * @step: Value step size */ struct linear_range { unsigned int min; unsigned int min_sel; unsigned int max_sel; unsigned int step; }; #define LINEAR_RANGE(_min, _min_sel, _max_sel, _step) \ { \ .min = _min, \ .min_sel = _min_sel, \ .max_sel = _max_sel, \ .step = _step, \ } #define LINEAR_RANGE_IDX(_idx, _min, _min_sel, _max_sel, _step) \ [_idx] = LINEAR_RANGE(_min, _min_sel, _max_sel, _step) unsigned int linear_range_values_in_range(const struct linear_range *r); unsigned int linear_range_values_in_range_array(const struct linear_range *r, int ranges); unsigned int linear_range_get_max_value(const struct linear_range *r); int linear_range_get_value(const struct linear_range *r, unsigned int selector, unsigned int *val); int linear_range_get_value_array(const struct linear_range *r, int ranges, unsigned int selector, unsigned int *val); int linear_range_get_selector_low(const struct linear_range *r, unsigned int val, unsigned int *selector, bool *found); int linear_range_get_selector_high(const struct linear_range *r, unsigned int val, unsigned int *selector, bool *found); void linear_range_get_selector_within(const struct linear_range *r, unsigned int val, unsigned int *selector); int linear_range_get_selector_low_array(const struct linear_range *r, int ranges, unsigned int val, unsigned int *selector, bool *found); #endif