[go: nahoru, domu]
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
31int 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}
54EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);
55
56int 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}
71EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);
72
73int 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}
99EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
100
101int 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}
123EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
124
125void 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}
142EXPORT_SYMBOL_GPL(pinctrl_utils_dt_free_map);
143