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  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  */
  18
  19 #include <linux/slab.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/device.h>
  23
  24 #include <net/wpan-phy.h>
  25
  26 #include "ieee802154.h"
  27
  28 #define MASTER_SHOW_COMPLEX(name, format_string, args...)               \
  29 static ssize_t name ## _show(struct device *dev,                        \
  30                             struct device_attribute *attr, char *buf)   \
  31 {                                                                       \
  32         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
  33         int ret;                                                        \
  34                                                                         \
  35         mutex_lock(&phy->pib_lock);                                     \
  36         ret = snprintf(buf, PAGE_SIZE, format_string "\n", args);       \
  37         mutex_unlock(&phy->pib_lock);                                   \
  38         return ret;                                                     \
  39 }                                                                       \
  40 static DEVICE_ATTR_RO(name);
  41
  42 #define MASTER_SHOW(field, format_string)                               \
  43         MASTER_SHOW_COMPLEX(field, format_string, phy->field)
  44
  45 MASTER_SHOW(current_channel, "%d");
  46 MASTER_SHOW(current_page, "%d");
  47 MASTER_SHOW(transmit_power, "%d +- 1 dB");
  48 MASTER_SHOW(cca_mode, "%d");
  49
  50 static ssize_t channels_supported_show(struct device *dev,
  51                                        struct device_attribute *attr,
  52                                        char *buf)
  53 {
  54         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
  55         int ret;
  56         int i, len = 0;
  57
  58         mutex_lock(&phy->pib_lock);
  59         for (i = 0; i < 32; i++) {
  60                 ret = snprintf(buf + len, PAGE_SIZE - len,
  61                                "%#09x\n", phy->channels_supported[i]);
  62                 if (ret < 0)
  63                         break;
  64                 len += ret;
  65         }
  66         mutex_unlock(&phy->pib_lock);
  67         return len;
  68 }
  69 static DEVICE_ATTR_RO(channels_supported);
  70
  71 static struct attribute *pmib_attrs[] = {
  72         &dev_attr_current_channel.attr,
  73         &dev_attr_current_page.attr,
  74         &dev_attr_channels_supported.attr,
  75         &dev_attr_transmit_power.attr,
  76         &dev_attr_cca_mode.attr,
  77         NULL,
  78 };
  79 ATTRIBUTE_GROUPS(pmib);
  80
  81 static void wpan_phy_release(struct device *d)
  82 {
  83         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  84
  85         kfree(phy);
  86 }
  87
  88 static struct class wpan_phy_class = {
  89         .name = "ieee802154",
  90         .dev_release = wpan_phy_release,
  91         .dev_groups = pmib_groups,
  92 };
  93
  94 static DEFINE_MUTEX(wpan_phy_mutex);
  95 static int wpan_phy_idx;
  96
  97 static int wpan_phy_match(struct device *dev, const void *data)
  98 {
  99         return !strcmp(dev_name(dev), (const char *)data);
 100 }
 101
 102 struct wpan_phy *wpan_phy_find(const char *str)
 103 {
 104         struct device *dev;
 105
 106         if (WARN_ON(!str))
 107                 return NULL;
 108
 109         dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
 110         if (!dev)
 111                 return NULL;
 112
 113         return container_of(dev, struct wpan_phy, dev);
 114 }
 115 EXPORT_SYMBOL(wpan_phy_find);
 116
 117 struct wpan_phy_iter_data {
 118         int (*fn)(struct wpan_phy *phy, void *data);
 119         void *data;
 120 };
 121
 122 static int wpan_phy_iter(struct device *dev, void *_data)
 123 {
 124         struct wpan_phy_iter_data *wpid = _data;
 125         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 126
 127         return wpid->fn(phy, wpid->data);
 128 }
 129
 130 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 131                       void *data)
 132 {
 133         struct wpan_phy_iter_data wpid = {
 134                 .fn = fn,
 135                 .data = data,
 136         };
 137
 138         return class_for_each_device(&wpan_phy_class, NULL,
 139                         &wpid, wpan_phy_iter);
 140 }
 141 EXPORT_SYMBOL(wpan_phy_for_each);
 142
 143 static int wpan_phy_idx_valid(int idx)
 144 {
 145         return idx >= 0;
 146 }
 147
 148 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 149 {
 150         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 151                         GFP_KERNEL);
 152
 153         if (!phy)
 154                 goto out;
 155         mutex_lock(&wpan_phy_mutex);
 156         phy->idx = wpan_phy_idx++;
 157         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 158                 wpan_phy_idx--;
 159                 mutex_unlock(&wpan_phy_mutex);
 160                 kfree(phy);
 161                 goto out;
 162         }
 163         mutex_unlock(&wpan_phy_mutex);
 164
 165         mutex_init(&phy->pib_lock);
 166
 167         device_initialize(&phy->dev);
 168         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 169
 170         phy->dev.class = &wpan_phy_class;
 171
 172         phy->current_channel = -1; /* not initialised */
 173         phy->current_page = 0; /* for compatibility */
 174
 175         return phy;
 176
 177 out:
 178         return NULL;
 179 }
 180 EXPORT_SYMBOL(wpan_phy_alloc);
 181
 182 int wpan_phy_register(struct wpan_phy *phy)
 183 {
 184         return device_add(&phy->dev);
 185 }
 186 EXPORT_SYMBOL(wpan_phy_register);
 187
 188 void wpan_phy_unregister(struct wpan_phy *phy)
 189 {
 190         device_del(&phy->dev);
 191 }
 192 EXPORT_SYMBOL(wpan_phy_unregister);
 193
 194 void wpan_phy_free(struct wpan_phy *phy)
 195 {
 196         put_device(&phy->dev);
 197 }
 198 EXPORT_SYMBOL(wpan_phy_free);
 199
 200 static int __init wpan_phy_class_init(void)
 201 {
 202         int rc;
 203
 204         rc = class_register(&wpan_phy_class);
 205         if (rc)
 206                 goto err;
 207
 208         rc = ieee802154_nl_init();
 209         if (rc)
 210                 goto err_nl;
 211
 212         return 0;
 213 err_nl:
 214         class_unregister(&wpan_phy_class);
 215 err:
 216         return rc;
 217 }
 218 subsys_initcall(wpan_phy_class_init);
 219
 220 static void __exit wpan_phy_class_exit(void)
 221 {
 222         ieee802154_nl_exit();
 223         class_unregister(&wpan_phy_class);
 224 }
 225 module_exit(wpan_phy_class_exit);
 226
 227 MODULE_LICENSE("GPL v2");
 228 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 229 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 230