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/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/device.h>
  22
  23 #include <net/wpan-phy.h>
  24
  25 #include "ieee802154.h"
  26
  27 #define MASTER_SHOW_COMPLEX(name, format_string, args...)               \
  28 static ssize_t name ## _show(struct device *dev,                        \
  29                             struct device_attribute *attr, char *buf)   \
  30 {                                                                       \
  31         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
  32         int ret;                                                        \
  33                                                                         \
  34         mutex_lock(&phy->pib_lock);                                     \
  35         ret = snprintf(buf, PAGE_SIZE, format_string "\n", args);       \
  36         mutex_unlock(&phy->pib_lock);                                   \
  37         return ret;                                                     \
  38 }
  39
  40 #define MASTER_SHOW(field, format_string)                               \
  41         MASTER_SHOW_COMPLEX(field, format_string, phy->field)
  42
  43 MASTER_SHOW(current_channel, "%d");
  44 MASTER_SHOW(current_page, "%d");
  45 MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
  46         ((signed char) (phy->transmit_power << 2)) >> 2,
  47         (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
  48 MASTER_SHOW(cca_mode, "%d");
  49
  50 static ssize_t channels_supported_show(struct device *dev,
  51                             struct device_attribute *attr, char *buf)
  52 {
  53         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
  54         int ret;
  55         int i, len = 0;
  56
  57         mutex_lock(&phy->pib_lock);
  58         for (i = 0; i < 32; i++) {
  59                 ret = snprintf(buf + len, PAGE_SIZE - len,
  60                                 "%#09x\n", phy->channels_supported[i]);
  61                 if (ret < 0)
  62                         break;
  63                 len += ret;
  64         }
  65         mutex_unlock(&phy->pib_lock);
  66         return len;
  67 }
  68
  69 static struct device_attribute pmib_attrs[] = {
  70         __ATTR_RO(current_channel),
  71         __ATTR_RO(current_page),
  72         __ATTR_RO(channels_supported),
  73         __ATTR_RO(transmit_power),
  74         __ATTR_RO(cca_mode),
  75         {},
  76 };
  77
  78 static void wpan_phy_release(struct device *d)
  79 {
  80         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  81         kfree(phy);
  82 }
  83
  84 static struct class wpan_phy_class = {
  85         .name = "ieee802154",
  86         .dev_release = wpan_phy_release,
  87         .dev_attrs = pmib_attrs,
  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, 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,
 106                         (void *)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         mutex_lock(&wpan_phy_mutex);
 150         phy->idx = wpan_phy_idx++;
 151         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 152                 wpan_phy_idx--;
 153                 mutex_unlock(&wpan_phy_mutex);
 154                 kfree(phy);
 155                 return NULL;
 156         }
 157         mutex_unlock(&wpan_phy_mutex);
 158
 159         mutex_init(&phy->pib_lock);
 160
 161         device_initialize(&phy->dev);
 162         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 163
 164         phy->dev.class = &wpan_phy_class;
 165
 166         phy->current_channel = -1; /* not initialised */
 167         phy->current_page = 0; /* for compatibility */
 168
 169         return phy;
 170 }
 171 EXPORT_SYMBOL(wpan_phy_alloc);
 172
 173 int wpan_phy_register(struct wpan_phy *phy)
 174 {
 175         return device_add(&phy->dev);
 176 }
 177 EXPORT_SYMBOL(wpan_phy_register);
 178
 179 void wpan_phy_unregister(struct wpan_phy *phy)
 180 {
 181         device_del(&phy->dev);
 182 }
 183 EXPORT_SYMBOL(wpan_phy_unregister);
 184
 185 void wpan_phy_free(struct wpan_phy *phy)
 186 {
 187         put_device(&phy->dev);
 188 }
 189 EXPORT_SYMBOL(wpan_phy_free);
 190
 191 static int __init wpan_phy_class_init(void)
 192 {
 193         int rc;
 194         rc = class_register(&wpan_phy_class);
 195         if (rc)
 196                 goto err;
 197
 198         rc = ieee802154_nl_init();
 199         if (rc)
 200                 goto err_nl;
 201
 202         return 0;
 203 err_nl:
 204         class_unregister(&wpan_phy_class);
 205 err:
 206         return rc;
 207 }
 208 subsys_initcall(wpan_phy_class_init);
 209
 210 static void __exit wpan_phy_class_exit(void)
 211 {
 212         ieee802154_nl_exit();
 213         class_unregister(&wpan_phy_class);
 214 }
 215 module_exit(wpan_phy_class_exit);
 216
 217 MODULE_LICENSE("GPL v2");
 218 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 219 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 220