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);
130