projects/linux·blob master · refs

129 lines · 3.2 KiB

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 <[email protected]>
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_array(configs, num_configs,
74 sizeof(*dup_configs), 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);