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);
128