1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Utils functions to implement the pincontrol driver.
  4 *
  5 * Copyright (c) 2013, NVIDIA Corporation.
  6 *
  7 * Author: Laxman Dewangan <ldewangan@nvidia.com>
  8 */
  9#include <linux/array_size.h>
 10#include <linux/device.h>
 11#include <linux/export.h>
 12#include <linux/of.h>
 13#include <linux/slab.h>
 14
 15#include <linux/pinctrl/pinctrl.h>
 16
 17#include "core.h"
 18#include "pinctrl-utils.h"
 19
 20int pinctrl_utils_reserve_map(struct pinctrl_dev *pctldev,
 21		struct pinctrl_map **map, unsigned int *reserved_maps,
 22		unsigned int *num_maps, unsigned int reserve)
 23{
 24	unsigned int old_num = *reserved_maps;
 25	unsigned int new_num = *num_maps + reserve;
 26	struct pinctrl_map *new_map;
 27
 28	if (old_num >= new_num)
 29		return 0;
 30
 31	new_map = krealloc_array(*map, new_num, sizeof(*new_map), GFP_KERNEL);
 32	if (!new_map) {
 33		dev_err(pctldev->dev, "krealloc(map) failed\n");
 34		return -ENOMEM;
 35	}
 36
 37	memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
 38
 39	*map = new_map;
 40	*reserved_maps = new_num;
 41	return 0;
 42}
 43EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);
 44
 45int pinctrl_utils_add_map_mux(struct pinctrl_dev *pctldev,
 46		struct pinctrl_map **map, unsigned int *reserved_maps,
 47		unsigned int *num_maps, const char *group,
 48		const char *function)
 49{
 50	if (WARN_ON(*num_maps == *reserved_maps))
 51		return -ENOSPC;
 52
 53	(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
 54	(*map)[*num_maps].data.mux.group = group;
 55	(*map)[*num_maps].data.mux.function = function;
 56	(*num_maps)++;
 57
 58	return 0;
 59}
 60EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);
 61
 62int pinctrl_utils_add_map_configs(struct pinctrl_dev *pctldev,
 63		struct pinctrl_map **map, unsigned int *reserved_maps,
 64		unsigned int *num_maps, const char *group,
 65		unsigned long *configs, unsigned int num_configs,
 66		enum pinctrl_map_type type)
 67{
 68	unsigned long *dup_configs;
 69
 70	if (WARN_ON(*num_maps == *reserved_maps))
 71		return -ENOSPC;
 72
 73	dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
 74			      GFP_KERNEL);
 75	if (!dup_configs)
 76		return -ENOMEM;
 77
 78	(*map)[*num_maps].type = type;
 79	(*map)[*num_maps].data.configs.group_or_pin = group;
 80	(*map)[*num_maps].data.configs.configs = dup_configs;
 81	(*map)[*num_maps].data.configs.num_configs = num_configs;
 82	(*num_maps)++;
 83
 84	return 0;
 85}
 86EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
 87
 88int pinctrl_utils_add_config(struct pinctrl_dev *pctldev,
 89		unsigned long **configs, unsigned int *num_configs,
 90		unsigned long config)
 91{
 92	unsigned int old_num = *num_configs;
 93	unsigned int new_num = old_num + 1;
 94	unsigned long *new_configs;
 95
 96	new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
 97			       GFP_KERNEL);
 98	if (!new_configs) {
 99		dev_err(pctldev->dev, "krealloc(configs) failed\n");
100		return -ENOMEM;
101	}
102
103	new_configs[old_num] = config;
104
105	*configs = new_configs;
106	*num_configs = new_num;
107
108	return 0;
109}
110EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
111
112void pinctrl_utils_free_map(struct pinctrl_dev *pctldev,
113	      struct pinctrl_map *map, unsigned int num_maps)
114{
115	int i;
116
117	for (i = 0; i < num_maps; i++) {
118		switch (map[i].type) {
119		case PIN_MAP_TYPE_CONFIGS_GROUP:
120		case PIN_MAP_TYPE_CONFIGS_PIN:
121			kfree(map[i].data.configs.configs);
122			break;
123		default:
124			break;
125		}
126	}
127	kfree(map);
128}
129EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);