net/ieee802154/wpan-class.c

   1 /*
   2  * Copyright (C) 2007, 2008, 2009 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/device.h>
  19
  20 #include <net/cfg802154.h>
  21
  22 #include "ieee802154.h"
  23
  24 #define MASTER_SHOW_COMPLEX(name, format_string, args...)               \
  25 static ssize_t name ## _show(struct device *dev,                        \
  26                             struct device_attribute *attr, char *buf)   \
  27 {                                                                       \
  28         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
  29         int ret;                                                        \
  30                                                                         \
  31         mutex_lock(&phy->pib_lock);                                     \
  32         ret = snprintf(buf, PAGE_SIZE, format_string "\n", args);       \
  33         mutex_unlock(&phy->pib_lock);                                   \
  34         return ret;                                                     \
  35 }                                                                       \
  36 static DEVICE_ATTR_RO(name)
  37
  38 #define MASTER_SHOW(field, format_string)                               \
  39         MASTER_SHOW_COMPLEX(field, format_string, phy->field)
  40
  41 MASTER_SHOW(current_channel, "%d");
  42 MASTER_SHOW(current_page, "%d");
  43 MASTER_SHOW(transmit_power, "%d +- 1 dB");
  44 MASTER_SHOW(cca_mode, "%d");
  45
  46 static ssize_t channels_supported_show(struct device *dev,
  47                                        struct device_attribute *attr,
  48                                        char *buf)
  49 {
  50         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
  51         int ret;
  52         int i, len = 0;
  53
  54         mutex_lock(&phy->pib_lock);
  55         for (i = 0; i < 32; i++) {
  56                 ret = snprintf(buf + len, PAGE_SIZE - len,
  57                                "%#09x\n", phy->channels_supported[i]);
  58                 if (ret < 0)
  59                         break;
  60                 len += ret;
  61         }
  62         mutex_unlock(&phy->pib_lock);
  63         return len;
  64 }
  65 static DEVICE_ATTR_RO(channels_supported);
  66
  67 static struct attribute *pmib_attrs[] = {
  68         &dev_attr_current_channel.attr,
  69         &dev_attr_current_page.attr,
  70         &dev_attr_channels_supported.attr,
  71         &dev_attr_transmit_power.attr,
  72         &dev_attr_cca_mode.attr,
  73         NULL,
  74 };
  75 ATTRIBUTE_GROUPS(pmib);
  76
  77 static void wpan_phy_release(struct device *d)
  78 {
  79         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  80
  81         kfree(phy);
  82 }
  83
  84 static struct class wpan_phy_class = {
  85         .name = "ieee802154",
  86         .dev_release = wpan_phy_release,
  87         .dev_groups = pmib_groups,
  88 };
  89
  90 static DEFINE_MUTEX(wpan_phy_mutex);
  91 static int wpan_phy_idx;
  92
  93 static int wpan_phy_match(struct device *dev, const void *data)
  94 {
  95         return !strcmp(dev_name(dev), (const char *)data);
  96 }
  97
  98 struct wpan_phy *wpan_phy_find(const char *str)
  99 {
 100         struct device *dev;
 101
 102         if (WARN_ON(!str))
 103                 return NULL;
 104
 105         dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
 106         if (!dev)
 107                 return NULL;
 108
 109         return container_of(dev, struct wpan_phy, dev);
 110 }
 111 EXPORT_SYMBOL(wpan_phy_find);
 112
 113 struct wpan_phy_iter_data {
 114         int (*fn)(struct wpan_phy *phy, void *data);
 115         void *data;
 116 };
 117
 118 static int wpan_phy_iter(struct device *dev, void *_data)
 119 {
 120         struct wpan_phy_iter_data *wpid = _data;
 121         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 122
 123         return wpid->fn(phy, wpid->data);
 124 }
 125
 126 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 127                       void *data)
 128 {
 129         struct wpan_phy_iter_data wpid = {
 130                 .fn = fn,
 131                 .data = data,
 132         };
 133
 134         return class_for_each_device(&wpan_phy_class, NULL,
 135                         &wpid, wpan_phy_iter);
 136 }
 137 EXPORT_SYMBOL(wpan_phy_for_each);
 138
 139 static int wpan_phy_idx_valid(int idx)
 140 {
 141         return idx >= 0;
 142 }
 143
 144 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 145 {
 146         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 147                         GFP_KERNEL);
 148
 149         if (!phy)
 150                 goto out;
 151         mutex_lock(&wpan_phy_mutex);
 152         phy->idx = wpan_phy_idx++;
 153         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 154                 wpan_phy_idx--;
 155                 mutex_unlock(&wpan_phy_mutex);
 156                 kfree(phy);
 157                 goto out;
 158         }
 159         mutex_unlock(&wpan_phy_mutex);
 160
 161         mutex_init(&phy->pib_lock);
 162
 163         device_initialize(&phy->dev);
 164         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 165
 166         phy->dev.class = &wpan_phy_class;
 167
 168         phy->current_channel = -1; /* not initialised */
 169         phy->current_page = 0; /* for compatibility */
 170
 171         return phy;
 172
 173 out:
 174         return NULL;
 175 }
 176 EXPORT_SYMBOL(wpan_phy_alloc);
 177
 178 int wpan_phy_register(struct wpan_phy *phy)
 179 {
 180         return device_add(&phy->dev);
 181 }
 182 EXPORT_SYMBOL(wpan_phy_register);
 183
 184 void wpan_phy_unregister(struct wpan_phy *phy)
 185 {
 186         device_del(&phy->dev);
 187 }
 188 EXPORT_SYMBOL(wpan_phy_unregister);
 189
 190 void wpan_phy_free(struct wpan_phy *phy)
 191 {
 192         put_device(&phy->dev);
 193 }
 194 EXPORT_SYMBOL(wpan_phy_free);
 195
 196 static int __init wpan_phy_class_init(void)
 197 {
 198         int rc;
 199
 200         rc = class_register(&wpan_phy_class);
 201         if (rc)
 202                 goto err;
 203
 204         rc = ieee802154_nl_init();
 205         if (rc)
 206                 goto err_nl;
 207
 208         return 0;
 209 err_nl:
 210         class_unregister(&wpan_phy_class);
 211 err:
 212         return rc;
 213 }
 214 subsys_initcall(wpan_phy_class_init);
 215
 216 static void __exit wpan_phy_class_exit(void)
 217 {
 218         ieee802154_nl_exit();
 219         class_unregister(&wpan_phy_class);
 220 }
 221 module_exit(wpan_phy_class_exit);
 222
 223 MODULE_LICENSE("GPL v2");
 224 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 225 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 226