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, const 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, str, wpan_phy_match);
 107         if (!dev)
 108                 return NULL;
 109
 110         return container_of(dev, struct wpan_phy, dev);
 111 }
 112 EXPORT_SYMBOL(wpan_phy_find);
 113
 114 struct wpan_phy_iter_data {
 115         int (*fn)(struct wpan_phy *phy, void *data);
 116         void *data;
 117 };
 118
 119 static int wpan_phy_iter(struct device *dev, void *_data)
 120 {
 121         struct wpan_phy_iter_data *wpid = _data;
 122         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 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         rc = class_register(&wpan_phy_class);
 200         if (rc)
 201                 goto err;
 202
 203         rc = ieee802154_nl_init();
 204         if (rc)
 205                 goto err_nl;
 206
 207         return 0;
 208 err_nl:
 209         class_unregister(&wpan_phy_class);
 210 err:
 211         return rc;
 212 }
 213 subsys_initcall(wpan_phy_class_init);
 214
 215 static void __exit wpan_phy_class_exit(void)
 216 {
 217         ieee802154_nl_exit();
 218         class_unregister(&wpan_phy_class);
 219 }
 220 module_exit(wpan_phy_class_exit);
 221
 222 MODULE_LICENSE("GPL v2");
 223 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 224 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 225