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_array(*map, new_num, sizeof(*new_map), 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 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 } 97 EXPORT_SYMBOL_GPL(pinctrl_utils_add_map_configs); 98 99 int 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 } 121 EXPORT_SYMBOL_GPL(pinctrl_utils_add_config); 122 123 void 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 } 140 EXPORT_SYMBOL_GPL(pinctrl_utils_free_map); 141