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		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}
 97EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
 98
 99int 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}
121EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
122
123void 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}
140EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);