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
  41 #define MASTER_SHOW(field, format_string)                               \
  42         MASTER_SHOW_COMPLEX(field, format_string, phy->field)
  43
  44 MASTER_SHOW(current_channel, "%d");
  45 MASTER_SHOW(current_page, "%d");
  46 MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
  47         ((signed char) (phy->transmit_power << 2)) >> 2,
  48         (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
  49 MASTER_SHOW(cca_mode, "%d");
  50
  51 static ssize_t channels_supported_show(struct device *dev,
  52                             struct device_attribute *attr, 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
  70 static struct device_attribute pmib_attrs[] = {
  71         __ATTR_RO(current_channel),
  72         __ATTR_RO(current_page),
  73         __ATTR_RO(channels_supported),
  74         __ATTR_RO(transmit_power),
  75         __ATTR_RO(cca_mode),
  76         {},
  77 };
  78
  79 static void wpan_phy_release(struct device *d)
  80 {
  81         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  82         kfree(phy);
  83 }
  84
  85 static struct class wpan_phy_class = {
  86         .name = "ieee802154",
  87         .dev_release = wpan_phy_release,
  88         .dev_attrs = pmib_attrs,
  89 };
  90
  91 static DEFINE_MUTEX(wpan_phy_mutex);
  92 static int wpan_phy_idx;
  93
  94 static int wpan_phy_match(struct device *dev, void *data)
  95 {
  96         return !strcmp(dev_name(dev), (const char *)data);
  97 }
  98
  99 struct wpan_phy *wpan_phy_find(const char *str)
 100 {
 101         struct device *dev;
 102
 103         if (WARN_ON(!str))
 104                 return NULL;
 105
 106         dev = class_find_device(&wpan_phy_class, NULL,
 107                         (void *)str, wpan_phy_match);
 108         if (!dev)
 109                 return NULL;
 110
 111         return container_of(dev, struct wpan_phy, dev);
 112 }
 113 EXPORT_SYMBOL(wpan_phy_find);
 114
 115 struct wpan_phy_iter_data {
 116         int (*fn)(struct wpan_phy *phy, void *data);
 117         void *data;
 118 };
 119
 120 static int wpan_phy_iter(struct device *dev, void *_data)
 121 {
 122         struct wpan_phy_iter_data *wpid = _data;
 123         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 124         return wpid->fn(phy, wpid->data);
 125 }
 126
 127 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 128                 void *data)
 129 {
 130         struct wpan_phy_iter_data wpid = {
 131                 .fn = fn,
 132                 .data = data,
 133         };
 134
 135         return class_for_each_device(&wpan_phy_class, NULL,
 136                         &wpid, wpan_phy_iter);
 137 }
 138 EXPORT_SYMBOL(wpan_phy_for_each);
 139
 140 static int wpan_phy_idx_valid(int idx)
 141 {
 142         return idx >= 0;
 143 }
 144
 145 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 146 {
 147         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 148                         GFP_KERNEL);
 149
 150         if (!phy)
 151                 goto out;
 152         mutex_lock(&wpan_phy_mutex);
 153         phy->idx = wpan_phy_idx++;
 154         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 155                 wpan_phy_idx--;
 156                 mutex_unlock(&wpan_phy_mutex);
 157                 kfree(phy);
 158                 goto out;
 159         }
 160         mutex_unlock(&wpan_phy_mutex);
 161
 162         mutex_init(&phy->pib_lock);
 163
 164         device_initialize(&phy->dev);
 165         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 166
 167         phy->dev.class = &wpan_phy_class;
 168
 169         phy->current_channel = -1; /* not initialised */
 170         phy->current_page = 0; /* for compatibility */
 171
 172         return phy;
 173
 174 out:
 175         return NULL;
 176 }
 177 EXPORT_SYMBOL(wpan_phy_alloc);
 178
 179 int wpan_phy_register(struct wpan_phy *phy)
 180 {
 181         return device_add(&phy->dev);
 182 }
 183 EXPORT_SYMBOL(wpan_phy_register);
 184
 185 void wpan_phy_unregister(struct wpan_phy *phy)
 186 {
 187         device_del(&phy->dev);
 188 }
 189 EXPORT_SYMBOL(wpan_phy_unregister);
 190
 191 void wpan_phy_free(struct wpan_phy *phy)
 192 {
 193         put_device(&phy->dev);
 194 }
 195 EXPORT_SYMBOL(wpan_phy_free);
 196
 197 static int __init wpan_phy_class_init(void)
 198 {
 199         int rc;
 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