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 
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 
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 
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 
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 
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