linux-stable/include/linux/linear_range.h
Gene Chen e12ef7bf34 lib: add linear range get selector within
Add linear range get selector within for choose closest selector
between minimum and maximum selector.

Signed-off-by: Gene Chen <gene_chen@richtek.com>
Reviewed-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2021-08-13 18:37:38 +02:00

50 lines
1.7 KiB
C

/* 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;
};
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