1 /*
2  * Utils functions to implement the pincontrol driver.
3  *
4  * Copyright (c) 2013, NVIDIA Corporation.
5  *
6  * Author: Laxman Dewangan <ldewangan@nvidia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13  * whether express or implied; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20  * 02111-1307, USA
21  */
22 #include <linux/device.h>
23 #include <linux/export.h>
24 #include <linux/kernel.h>
25 #include <linux/pinctrl/pinctrl.h>
26 #include <linux/of.h>
27 #include <linux/slab.h>
28 #include "core.h"
29 #include "pinctrl-utils.h"
30 
31 int pinctrl_utils_reserve_map(struct pinctrl_dev *pctldev,
32 		struct pinctrl_map **map, unsigned *reserved_maps,
33 		unsigned *num_maps, unsigned reserve)
34 {
35 	unsigned old_num = *reserved_maps;
36 	unsigned new_num = *num_maps + reserve;
37 	struct pinctrl_map *new_map;
38 
39 	if (old_num >= new_num)
40 		return 0;
41 
42 	new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
43 	if (!new_map) {
44 		dev_err(pctldev->dev, "krealloc(map) failed\n");
45 		return -ENOMEM;
46 	}
47 
48 	memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
49 
50 	*map = new_map;
51 	*reserved_maps = new_num;
52 	return 0;
53 }
54 EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);
55 
56 int pinctrl_utils_add_map_mux(struct pinctrl_dev *pctldev,
57 		struct pinctrl_map **map, unsigned *reserved_maps,
58 		unsigned *num_maps, const char *group,
59 		const char *function)
60 {
61 	if (WARN_ON(*num_maps == *reserved_maps))
62 		return -ENOSPC;
63 
64 	(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
65 	(*map)[*num_maps].data.mux.group = group;
66 	(*map)[*num_maps].data.mux.function = function;
67 	(*num_maps)++;
68 
69 	return 0;
70 }
71 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);
72 
73 int pinctrl_utils_add_map_configs(struct pinctrl_dev *pctldev,
74 		struct pinctrl_map **map, unsigned *reserved_maps,
75 		unsigned *num_maps, const char *group,
76 		unsigned long *configs, unsigned num_configs,
77 		enum pinctrl_map_type type)
78 {
79 	unsigned long *dup_configs;
80 
81 	if (WARN_ON(*num_maps == *reserved_maps))
82 		return -ENOSPC;
83 
84 	dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
85 			      GFP_KERNEL);
86 	if (!dup_configs) {
87 		dev_err(pctldev->dev, "kmemdup(configs) failed\n");
88 		return -ENOMEM;
89 	}
90 
91 	(*map)[*num_maps].type = type;
92 	(*map)[*num_maps].data.configs.group_or_pin = group;
93 	(*map)[*num_maps].data.configs.configs = dup_configs;
94 	(*map)[*num_maps].data.configs.num_configs = num_configs;
95 	(*num_maps)++;
96 
97 	return 0;
98 }
99 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
100 
101 int pinctrl_utils_add_config(struct pinctrl_dev *pctldev,
102 		unsigned long **configs, unsigned *num_configs,
103 		unsigned long config)
104 {
105 	unsigned old_num = *num_configs;
106 	unsigned new_num = old_num + 1;
107 	unsigned long *new_configs;
108 
109 	new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
110 			       GFP_KERNEL);
111 	if (!new_configs) {
112 		dev_err(pctldev->dev, "krealloc(configs) failed\n");
113 		return -ENOMEM;
114 	}
115 
116 	new_configs[old_num] = config;
117 
118 	*configs = new_configs;
119 	*num_configs = new_num;
120 
121 	return 0;
122 }
123 EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
124 
125 void pinctrl_utils_free_map(struct pinctrl_dev *pctldev,
126 	      struct pinctrl_map *map, unsigned num_maps)
127 {
128 	int i;
129 
130 	for (i = 0; i < num_maps; i++) {
131 		switch (map[i].type) {
132 		case PIN_MAP_TYPE_CONFIGS_GROUP:
133 		case PIN_MAP_TYPE_CONFIGS_PIN:
134 			kfree(map[i].data.configs.configs);
135 			break;
136 		default:
137 			break;
138 		}
139 	}
140 	kfree(map);
141 }
142 EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);
143