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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Amit Sunil Dhamne
f23388d0f6
Add a helper function to find the selector for a given value in a linear range array. The selector should be such that the value it represents should be higher or equal to the given value. Signed-off-by: Amit Sunil Dhamne <amitsd@google.com> Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://patch.msgid.link/20260325-max77759-charger-v9-4-4486dd297adc@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2020 ROHM Semiconductors */
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#ifndef LINEAR_RANGE_H
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#define LINEAR_RANGE_H
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#include <linux/types.h>
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/**
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* struct linear_range - table of selector - value pairs
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*
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* Define a lookup-table for range of values. Intended to help when looking
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* for a register value matching certaing physical measure (like voltage).
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* Usable when increment of one in register always results a constant increment
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* of the physical measure (like voltage).
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*
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* @min: Lowest value in range
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* @min_sel: Lowest selector for range
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* @max_sel: Highest selector for range
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* @step: Value step size
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*/
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struct linear_range {
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unsigned int min;
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unsigned int min_sel;
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unsigned int max_sel;
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unsigned int step;
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};
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#define LINEAR_RANGE(_min, _min_sel, _max_sel, _step) \
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{ \
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.min = _min, \
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.min_sel = _min_sel, \
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.max_sel = _max_sel, \
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.step = _step, \
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}
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#define LINEAR_RANGE_IDX(_idx, _min, _min_sel, _max_sel, _step) \
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[_idx] = LINEAR_RANGE(_min, _min_sel, _max_sel, _step)
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unsigned int linear_range_values_in_range(const struct linear_range *r);
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unsigned int linear_range_values_in_range_array(const struct linear_range *r,
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int ranges);
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unsigned int linear_range_get_max_value(const struct linear_range *r);
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int linear_range_get_value(const struct linear_range *r, unsigned int selector,
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unsigned int *val);
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int linear_range_get_value_array(const struct linear_range *r, int ranges,
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unsigned int selector, unsigned int *val);
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int linear_range_get_selector_low(const struct linear_range *r,
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unsigned int val, unsigned int *selector,
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bool *found);
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int linear_range_get_selector_high(const struct linear_range *r,
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unsigned int val, unsigned int *selector,
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bool *found);
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void linear_range_get_selector_within(const struct linear_range *r,
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unsigned int val, unsigned int *selector);
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int linear_range_get_selector_low_array(const struct linear_range *r,
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int ranges, unsigned int val,
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unsigned int *selector, bool *found);
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int linear_range_get_selector_high_array(const struct linear_range *r,
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int ranges, unsigned int val,
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unsigned int *selector, bool *found);
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#endif
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