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