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 
pinctrl_utils_reserve_map(struct pinctrl_dev * pctldev,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps,unsigned reserve)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_array(*map, new_num, sizeof(*new_map), 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 
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)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 
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)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 		return -ENOMEM;
88 
89 	(*map)[*num_maps].type = type;
90 	(*map)[*num_maps].data.configs.group_or_pin = group;
91 	(*map)[*num_maps].data.configs.configs = dup_configs;
92 	(*map)[*num_maps].data.configs.num_configs = num_configs;
93 	(*num_maps)++;
94 
95 	return 0;
96 }
97 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
98 
pinctrl_utils_add_config(struct pinctrl_dev * pctldev,unsigned long ** configs,unsigned * num_configs,unsigned long config)99 int pinctrl_utils_add_config(struct pinctrl_dev *pctldev,
100 		unsigned long **configs, unsigned *num_configs,
101 		unsigned long config)
102 {
103 	unsigned old_num = *num_configs;
104 	unsigned new_num = old_num + 1;
105 	unsigned long *new_configs;
106 
107 	new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
108 			       GFP_KERNEL);
109 	if (!new_configs) {
110 		dev_err(pctldev->dev, "krealloc(configs) failed\n");
111 		return -ENOMEM;
112 	}
113 
114 	new_configs[old_num] = config;
115 
116 	*configs = new_configs;
117 	*num_configs = new_num;
118 
119 	return 0;
120 }
121 EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
122 
pinctrl_utils_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned num_maps)123 void pinctrl_utils_free_map(struct pinctrl_dev *pctldev,
124 	      struct pinctrl_map *map, unsigned num_maps)
125 {
126 	int i;
127 
128 	for (i = 0; i < num_maps; i++) {
129 		switch (map[i].type) {
130 		case PIN_MAP_TYPE_CONFIGS_GROUP:
131 		case PIN_MAP_TYPE_CONFIGS_PIN:
132 			kfree(map[i].data.configs.configs);
133 			break;
134 		default:
135 			break;
136 		}
137 	}
138 	kfree(map);
139 }
140 EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);
141