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(*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
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 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
pinctrl_utils_add_config(struct pinctrl_dev * pctldev,unsigned long ** configs,unsigned * num_configs,unsigned long config)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
pinctrl_utils_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned num_maps)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