diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-utils.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-utils.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-utils.c b/drivers/pinctrl/pinctrl-utils.c new file mode 100644 index 000000000..d77693f2c --- /dev/null +++ b/drivers/pinctrl/pinctrl-utils.c @@ -0,0 +1,142 @@ +/* + * Utils functions to implement the pincontrol driver. + * + * Copyright (c) 2013, NVIDIA Corporation. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307, USA + */ +#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(*map, sizeof(*new_map) * new_num, 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) { + dev_err(pctldev->dev, "kmemdup(configs) failed\n"); + 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_dt_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_dt_free_map); |