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_COMPLEX(transmit_power, "%d +- %d dB",
  48         ((signed char) (phy->transmit_power << 2)) >> 2,
  49         (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
  50 MASTER_SHOW(cca_mode, "%d");
  51
  52 static ssize_t channels_supported_show(struct device *dev,
  53                             struct device_attribute *attr, char *buf)
  54 {
  55         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
  56         int ret;
  57         int i, len = 0;
  58
  59         mutex_lock(&phy->pib_lock);
  60         for (i = 0; i < 32; i++) {
  61                 ret = snprintf(buf + len, PAGE_SIZE - len,
  62                                 "%#09x\n", phy->channels_supported[i]);
  63                 if (ret < 0)
  64                         break;
  65                 len += ret;
  66         }
  67         mutex_unlock(&phy->pib_lock);
  68         return len;
  69 }
  70 static DEVICE_ATTR_RO(channels_supported);
  71
  72 static struct attribute *pmib_attrs[] = {
  73         &dev_attr_current_channel.attr,
  74         &dev_attr_current_page.attr,
  75         &dev_attr_channels_supported.attr,
  76         &dev_attr_transmit_power.attr,
  77         &dev_attr_cca_mode.attr,
  78         NULL,
  79 };
  80 ATTRIBUTE_GROUPS(pmib);
  81
  82 static void wpan_phy_release(struct device *d)
  83 {
  84         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  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         return wpid->fn(phy, wpid->data);
 127 }
 128
 129 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 130                 void *data)
 131 {
 132         struct wpan_phy_iter_data wpid = {
 133                 .fn = fn,
 134                 .data = data,
 135         };
 136
 137         return class_for_each_device(&wpan_phy_class, NULL,
 138                         &wpid, wpan_phy_iter);
 139 }
 140 EXPORT_SYMBOL(wpan_phy_for_each);
 141
 142 static int wpan_phy_idx_valid(int idx)
 143 {
 144         return idx >= 0;
 145 }
 146
 147 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 148 {
 149         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 150                         GFP_KERNEL);
 151
 152         if (!phy)
 153                 goto out;
 154         mutex_lock(&wpan_phy_mutex);
 155         phy->idx = wpan_phy_idx++;
 156         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 157                 wpan_phy_idx--;
 158                 mutex_unlock(&wpan_phy_mutex);
 159                 kfree(phy);
 160                 goto out;
 161         }
 162         mutex_unlock(&wpan_phy_mutex);
 163
 164         mutex_init(&phy->pib_lock);
 165
 166         device_initialize(&phy->dev);
 167         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 168
 169         phy->dev.class = &wpan_phy_class;
 170
 171         phy->current_channel = -1; /* not initialised */
 172         phy->current_page = 0; /* for compatibility */
 173
 174         return phy;
 175
 176 out:
 177         return NULL;
 178 }
 179 EXPORT_SYMBOL(wpan_phy_alloc);
 180
 181 int wpan_phy_register(struct wpan_phy *phy)
 182 {
 183         return device_add(&phy->dev);
 184 }
 185 EXPORT_SYMBOL(wpan_phy_register);
 186
 187 void wpan_phy_unregister(struct wpan_phy *phy)
 188 {
 189         device_del(&phy->dev);
 190 }
 191 EXPORT_SYMBOL(wpan_phy_unregister);
 192
 193 void wpan_phy_free(struct wpan_phy *phy)
 194 {
 195         put_device(&phy->dev);
 196 }
 197 EXPORT_SYMBOL(wpan_phy_free);
 198
 199 static int __init wpan_phy_class_init(void)
 200 {
 201         int rc;
 202         rc = class_register(&wpan_phy_class);
 203         if (rc)
 204                 goto err;
 205
 206         rc = ieee802154_nl_init();
 207         if (rc)
 208                 goto err_nl;
 209
 210         return 0;
 211 err_nl:
 212         class_unregister(&wpan_phy_class);
 213 err:
 214         return rc;
 215 }
 216 subsys_initcall(wpan_phy_class_init);
 217
 218 static void __exit wpan_phy_class_exit(void)
 219 {
 220         ieee802154_nl_exit();
 221         class_unregister(&wpan_phy_class);
 222 }
 223 module_exit(wpan_phy_class_exit);
 224
 225 MODULE_LICENSE("GPL v2");
 226 MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
 227 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
 228