drivers/pinctrl/pinctrl-utils.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Utils functions to implement the pincontrol driver.
   4  *
   5  * Copyright (c) 2013, NVIDIA Corporation.
   6  *
   7  * Author: Laxman Dewangan <ldewangan@nvidia.com>
   8  */
   9 #include <linux/array_size.h>
  10 #include <linux/device.h>
  11 #include <linux/export.h>
  12 #include <linux/of.h>
  13 #include <linux/slab.h>
  14
  15 #include <linux/pinctrl/pinctrl.h>
  16
  17 #include "core.h"
  18 #include "pinctrl-utils.h"
  19
  20 int pinctrl_utils_reserve_map(struct pinctrl_dev *pctldev,
  21                 struct pinctrl_map **map, unsigned *reserved_maps,
  22                 unsigned *num_maps, unsigned reserve)
  23 {
  24         unsigned old_num = *reserved_maps;
  25         unsigned new_num = *num_maps + reserve;
  26         struct pinctrl_map *new_map;
  27
  28         if (old_num >= new_num)
  29                 return 0;
  30
  31         new_map = krealloc_array(*map, new_num, sizeof(*new_map), GFP_KERNEL);
  32         if (!new_map) {
  33                 dev_err(pctldev->dev, "krealloc(map) failed\n");
  34                 return -ENOMEM;
  35         }
  36
  37         memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
  38
  39         *map = new_map;
  40         *reserved_maps = new_num;
  41         return 0;
  42 }
  43 EXPORT_SYMBOL_GPL(pinctrl_utils_reserve_map);
  44
  45 int pinctrl_utils_add_map_mux(struct pinctrl_dev *pctldev,
  46                 struct pinctrl_map **map, unsigned *reserved_maps,
  47                 unsigned *num_maps, const char *group,
  48                 const char *function)
  49 {
  50         if (WARN_ON(*num_maps == *reserved_maps))
  51                 return -ENOSPC;
  52
  53         (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
  54         (*map)[*num_maps].data.mux.group = group;
  55         (*map)[*num_maps].data.mux.function = function;
  56         (*num_maps)++;
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_mux);
  61
  62 int pinctrl_utils_add_map_configs(struct pinctrl_dev *pctldev,
  63                 struct pinctrl_map **map, unsigned *reserved_maps,
  64                 unsigned *num_maps, const char *group,
  65                 unsigned long *configs, unsigned num_configs,
  66                 enum pinctrl_map_type type)
  67 {
  68         unsigned long *dup_configs;
  69
  70         if (WARN_ON(*num_maps == *reserved_maps))
  71                 return -ENOSPC;
  72
  73         dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
  74                               GFP_KERNEL);
  75         if (!dup_configs)
  76                 return -ENOMEM;
  77
  78         (*map)[*num_maps].type = type;
  79         (*map)[*num_maps].data.configs.group_or_pin = group;
  80         (*map)[*num_maps].data.configs.configs = dup_configs;
  81         (*map)[*num_maps].data.configs.num_configs = num_configs;
  82         (*num_maps)++;
  83
  84         return 0;
  85 }
  86 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs);
  87
  88 int pinctrl_utils_add_config(struct pinctrl_dev *pctldev,
  89                 unsigned long **configs, unsigned *num_configs,
  90                 unsigned long config)
  91 {
  92         unsigned old_num = *num_configs;
  93         unsigned new_num = old_num + 1;
  94         unsigned long *new_configs;
  95
  96         new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
  97                                GFP_KERNEL);
  98         if (!new_configs) {
  99                 dev_err(pctldev->dev, "krealloc(configs) failed\n");
 100                 return -ENOMEM;
 101         }
 102
 103         new_configs[old_num] = config;
 104
 105         *configs = new_configs;
 106         *num_configs = new_num;
 107
 108         return 0;
 109 }
 110 EXPORT_SYMBOL_GPL(pinctrl_utils_add_config);
 111
 112 void pinctrl_utils_free_map(struct pinctrl_dev *pctldev,
 113               struct pinctrl_map *map, unsigned num_maps)
 114 {
 115         int i;
 116
 117         for (i = 0; i < num_maps; i++) {
 118                 switch (map[i].type) {
 119                 case PIN_MAP_TYPE_CONFIGS_GROUP:
 120                 case PIN_MAP_TYPE_CONFIGS_PIN:
 121                         kfree(map[i].data.configs.configs);
 122                         break;
 123                 default:
 124                         break;
 125                 }
 126         }
 127         kfree(map);
 128 }
 129 EXPORT_SYMBOL_GPL(pinctrl_utils_free_map);