Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / pinctrl / pinctrl-utils.c
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_dt_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_dt_free_map);