linux/net/ieee802154/wpan-class.c
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   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...)               \
  29static 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
  44MASTER_SHOW(current_channel, "%d");
  45MASTER_SHOW(current_page, "%d");
  46MASTER_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 );
  49MASTER_SHOW(cca_mode, "%d");
  50
  51static 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
  70static 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
  79static 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
  85static struct class wpan_phy_class = {
  86        .name = "ieee802154",
  87        .dev_release = wpan_phy_release,
  88        .dev_attrs = pmib_attrs,
  89};
  90
  91static DEFINE_MUTEX(wpan_phy_mutex);
  92static int wpan_phy_idx;
  93
  94static int wpan_phy_match(struct device *dev, void *data)
  95{
  96        return !strcmp(dev_name(dev), (const char *)data);
  97}
  98
  99struct 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}
 113EXPORT_SYMBOL(wpan_phy_find);
 114
 115struct wpan_phy_iter_data {
 116        int (*fn)(struct wpan_phy *phy, void *data);
 117        void *data;
 118};
 119
 120static 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
 127int 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}
 138EXPORT_SYMBOL(wpan_phy_for_each);
 139
 140static int wpan_phy_idx_valid(int idx)
 141{
 142        return idx >= 0;
 143}
 144
 145struct 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
 174out:
 175        return NULL;
 176}
 177EXPORT_SYMBOL(wpan_phy_alloc);
 178
 179int wpan_phy_register(struct wpan_phy *phy)
 180{
 181        return device_add(&phy->dev);
 182}
 183EXPORT_SYMBOL(wpan_phy_register);
 184
 185void wpan_phy_unregister(struct wpan_phy *phy)
 186{
 187        device_del(&phy->dev);
 188}
 189EXPORT_SYMBOL(wpan_phy_unregister);
 190
 191void wpan_phy_free(struct wpan_phy *phy)
 192{
 193        put_device(&phy->dev);
 194}
 195EXPORT_SYMBOL(wpan_phy_free);
 196
 197static 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;
 209err_nl:
 210        class_unregister(&wpan_phy_class);
 211err:
 212        return rc;
 213}
 214subsys_initcall(wpan_phy_class_init);
 215
 216static void __exit wpan_phy_class_exit(void)
 217{
 218        ieee802154_nl_exit();
 219        class_unregister(&wpan_phy_class);
 220}
 221module_exit(wpan_phy_class_exit);
 222
 223MODULE_LICENSE("GPL v2");
 224MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 225MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 226
 227
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