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
pinctrl_utils_reserve_map(struct pinctrl_dev * pctldev,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps,unsigned reserve)18 int 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 }
41 EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);
42
pinctrl_utils_add_map_mux(struct pinctrl_dev * pctldev,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps,const char * group,const char * function)43 int 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 }
58 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);
59
pinctrl_utils_add_map_configs(struct pinctrl_dev * pctldev,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps,const char * group,unsigned long * configs,unsigned num_configs,enum pinctrl_map_type type)60 int 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 }
84 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
85
pinctrl_utils_add_config(struct pinctrl_dev * pctldev,unsigned long ** configs,unsigned * num_configs,unsigned long config)86 int 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 }
108 EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
109
pinctrl_utils_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned num_maps)110 void 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 }
127 EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);
128