pinctrl: add utility functions for add map/configs

Some of pincontrol driver needs the utility function to create map
list. The utility function needed for adding mux, configs etc.

In place of duplicating this in each driver, add the common utility
function in common file and use from device specific driver. This will
reduce the duplicating of code across drivers.

Changes from V1:
- Add this files in this patch and add common utility APIs to here.

Changes from V2:
- Nothing in code.
- Added Reviewed by Stephen.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 135 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-utils.c b/drivers/pinctrl/pinctrl-utils.c
new file mode 100644
index 000000000000..b7ac646c43ba
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-utils.c
@@ -0,0 +1,135 @@
+/*
+ * 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/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++)
+                if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
+                        kfree(map[i].data.configs.configs);
+
+        kfree(map);
+}
+EXPORT_SYMBOL_GPL(pinctrl_utils_dt_free_map);