summaryrefslogtreecommitdiff
path: root/drivers/pinctrl/pinctrl-utils.c
blob: 3580e0fd94ed51d7a8ce32b5d2570efa4e619101 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Utils functions to implement the pincontrol driver.
 *
 * Copyright (c) 2013, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 */
#include <linux/device.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/of.h>
#include <linux/slab.h>
#include "core.h"
#include "pinctrl-utils.h"

int pinctrl_utils_reserve_map(struct pinctrl_dev *pctldev,
		struct pinctrl_map **map, unsigned *reserved_maps,
		unsigned *num_maps, unsigned reserve)
{
	unsigned old_num = *reserved_maps;
	unsigned new_num = *num_maps + reserve;
	struct pinctrl_map *new_map;

	if (old_num >= new_num)
		return 0;

	new_map = krealloc_array(*map, new_num, sizeof(*new_map), GFP_KERNEL);
	if (!new_map) {
		dev_err(pctldev->dev, "krealloc(map) failed\n");
		return -ENOMEM;
	}

	memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));

	*map = new_map;
	*reserved_maps = new_num;
	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);

int 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)
{
	if (WARN_ON(*num_maps == *reserved_maps))
		return -ENOSPC;

	(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
	(*map)[*num_maps].data.mux.group = group;
	(*map)[*num_maps].data.mux.function = function;
	(*num_maps)++;

	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);

int 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)
{
	unsigned long *dup_configs;

	if (WARN_ON(*num_maps == *reserved_maps))
		return -ENOSPC;

	dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
			      GFP_KERNEL);
	if (!dup_configs)
		return -ENOMEM;

	(*map)[*num_maps].type = type;
	(*map)[*num_maps].data.configs.group_or_pin = group;
	(*map)[*num_maps].data.configs.configs = dup_configs;
	(*map)[*num_maps].data.configs.num_configs = num_configs;
	(*num_maps)++;

	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);

int pinctrl_utils_add_config(struct pinctrl_dev *pctldev,
		unsigned long **configs, unsigned *num_configs,
		unsigned long config)
{
	unsigned old_num = *num_configs;
	unsigned new_num = old_num + 1;
	unsigned long *new_configs;

	new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
			       GFP_KERNEL);
	if (!new_configs) {
		dev_err(pctldev->dev, "krealloc(configs) failed\n");
		return -ENOMEM;
	}

	new_configs[old_num] = config;

	*configs = new_configs;
	*num_configs = new_num;

	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);

void pinctrl_utils_free_map(struct pinctrl_dev *pctldev,
	      struct pinctrl_map *map, unsigned num_maps)
{
	int i;

	for (i = 0; i < num_maps; i++) {
		switch (map[i].type) {
		case PIN_MAP_TYPE_CONFIGS_GROUP:
		case PIN_MAP_TYPE_CONFIGS_PIN:
			kfree(map[i].data.configs.configs);
			break;
		default:
			break;
		}
	}
	kfree(map);
}
EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);