net/mac802154/ieee802154_dev.c

   1 /*
   2  * Copyright (C) 2007-2012 Siemens AG
   3  *
   4  * Written by:
   5  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   6  *
   7  * Based on the code from 'linux-zigbee.sourceforge.net' project.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26
  27 #include <net/netlink.h>
  28 #include <linux/nl802154.h>
  29 #include <net/mac802154.h>
  30 #include <net/route.h>
  31 #include <net/wpan-phy.h>
  32
  33 #include "mac802154.h"
  34
  35 int mac802154_slave_open(struct net_device *dev)
  36 {
  37         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  38         struct mac802154_priv *ipriv = priv->hw;
  39         int res = 0;
  40
  41         if (ipriv->open_count++ == 0) {
  42                 res = ipriv->ops->start(&ipriv->hw);
  43                 WARN_ON(res);
  44                 if (res)
  45                         goto err;
  46         }
  47
  48         if (ipriv->ops->ieee_addr) {
  49                 res = ipriv->ops->ieee_addr(&ipriv->hw, dev->dev_addr);
  50                 WARN_ON(res);
  51                 if (res)
  52                         goto err;
  53                 mac802154_dev_set_ieee_addr(dev);
  54         }
  55
  56         netif_start_queue(dev);
  57         return 0;
  58 err:
  59         priv->hw->open_count--;
  60
  61         return res;
  62 }
  63
  64 int mac802154_slave_close(struct net_device *dev)
  65 {
  66         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  67         struct mac802154_priv *ipriv = priv->hw;
  68
  69         netif_stop_queue(dev);
  70
  71         if (!--ipriv->open_count)
  72                 ipriv->ops->stop(&ipriv->hw);
  73
  74         return 0;
  75 }
  76
  77 static int
  78 mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
  79 {
  80         struct mac802154_sub_if_data *priv;
  81         struct mac802154_priv *ipriv;
  82         int err;
  83
  84         ipriv = wpan_phy_priv(phy);
  85
  86         priv = netdev_priv(dev);
  87         priv->dev = dev;
  88         priv->hw = ipriv;
  89
  90         dev->needed_headroom = ipriv->hw.extra_tx_headroom;
  91
  92         SET_NETDEV_DEV(dev, &ipriv->phy->dev);
  93
  94         mutex_lock(&ipriv->slaves_mtx);
  95         if (!ipriv->running) {
  96                 mutex_unlock(&ipriv->slaves_mtx);
  97                 return -ENODEV;
  98         }
  99         mutex_unlock(&ipriv->slaves_mtx);
 100
 101         err = register_netdev(dev);
 102         if (err < 0)
 103                 return err;
 104
 105         rtnl_lock();
 106         mutex_lock(&ipriv->slaves_mtx);
 107         list_add_tail_rcu(&priv->list, &ipriv->slaves);
 108         mutex_unlock(&ipriv->slaves_mtx);
 109         rtnl_unlock();
 110
 111         return 0;
 112 }
 113
 114 static void
 115 mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
 116 {
 117         struct mac802154_sub_if_data *sdata;
 118         ASSERT_RTNL();
 119
 120         sdata = netdev_priv(dev);
 121
 122         BUG_ON(sdata->hw->phy != phy);
 123
 124         mutex_lock(&sdata->hw->slaves_mtx);
 125         list_del_rcu(&sdata->list);
 126         mutex_unlock(&sdata->hw->slaves_mtx);
 127
 128         synchronize_rcu();
 129         unregister_netdevice(sdata->dev);
 130 }
 131
 132 static struct net_device *
 133 mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
 134 {
 135         struct net_device *dev;
 136         int err = -ENOMEM;
 137
 138         switch (type) {
 139         case IEEE802154_DEV_MONITOR:
 140                 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
 141                                    name, mac802154_monitor_setup);
 142                 break;
 143         default:
 144                 dev = NULL;
 145                 err = -EINVAL;
 146                 break;
 147         }
 148         if (!dev)
 149                 goto err;
 150
 151         err = mac802154_netdev_register(phy, dev);
 152         if (err)
 153                 goto err_free;
 154
 155         dev_hold(dev); /* we return an incremented device refcount */
 156         return dev;
 157
 158 err_free:
 159         free_netdev(dev);
 160 err:
 161         return ERR_PTR(err);
 162 }
 163
 164 struct ieee802154_dev *
 165 ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
 166 {
 167         struct wpan_phy *phy;
 168         struct mac802154_priv *priv;
 169         size_t priv_size;
 170
 171         if (!ops || !ops->xmit || !ops->ed || !ops->start ||
 172             !ops->stop || !ops->set_channel) {
 173                 printk(KERN_ERR
 174                        "undefined IEEE802.15.4 device operations\n");
 175                 return NULL;
 176         }
 177
 178         /* Ensure 32-byte alignment of our private data and hw private data.
 179          * We use the wpan_phy priv data for both our mac802154_priv and for
 180          * the driver's private data
 181          *
 182          * in memory it'll be like this:
 183          *
 184          * +-----------------------+
 185          * | struct wpan_phy       |
 186          * +-----------------------+
 187          * | struct mac802154_priv |
 188          * +-----------------------+
 189          * | driver's private data |
 190          * +-----------------------+
 191          *
 192          * Due to ieee802154 layer isn't aware of driver and MAC structures,
 193          * so lets allign them here.
 194          */
 195
 196         priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
 197
 198         phy = wpan_phy_alloc(priv_size);
 199         if (!phy) {
 200                 printk(KERN_ERR
 201                        "failure to allocate master IEEE802.15.4 device\n");
 202                 return NULL;
 203         }
 204
 205         priv = wpan_phy_priv(phy);
 206         priv->hw.phy = priv->phy = phy;
 207         priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
 208         priv->ops = ops;
 209
 210         INIT_LIST_HEAD(&priv->slaves);
 211         mutex_init(&priv->slaves_mtx);
 212
 213         return &priv->hw;
 214 }
 215 EXPORT_SYMBOL(ieee802154_alloc_device);
 216
 217 void ieee802154_free_device(struct ieee802154_dev *hw)
 218 {
 219         struct mac802154_priv *priv = mac802154_to_priv(hw);
 220
 221         BUG_ON(!list_empty(&priv->slaves));
 222
 223         wpan_phy_free(priv->phy);
 224
 225         mutex_destroy(&priv->slaves_mtx);
 226 }
 227 EXPORT_SYMBOL(ieee802154_free_device);
 228
 229 int ieee802154_register_device(struct ieee802154_dev *dev)
 230 {
 231         struct mac802154_priv *priv = mac802154_to_priv(dev);
 232         int rc = -ENOMEM;
 233
 234         priv->dev_workqueue =
 235                 create_singlethread_workqueue(wpan_phy_name(priv->phy));
 236         if (!priv->dev_workqueue)
 237                 goto out;
 238
 239         wpan_phy_set_dev(priv->phy, priv->hw.parent);
 240
 241         priv->phy->add_iface = mac802154_add_iface;
 242         priv->phy->del_iface = mac802154_del_iface;
 243
 244         rc = wpan_phy_register(priv->phy);
 245         if (rc < 0)
 246                 goto out_wq;
 247
 248         rtnl_lock();
 249
 250         mutex_lock(&priv->slaves_mtx);
 251         priv->running = MAC802154_DEVICE_RUN;
 252         mutex_unlock(&priv->slaves_mtx);
 253
 254         rtnl_unlock();
 255
 256         return 0;
 257
 258 out_wq:
 259         destroy_workqueue(priv->dev_workqueue);
 260 out:
 261         return rc;
 262 }
 263 EXPORT_SYMBOL(ieee802154_register_device);
 264
 265 void ieee802154_unregister_device(struct ieee802154_dev *dev)
 266 {
 267         struct mac802154_priv *priv = mac802154_to_priv(dev);
 268         struct mac802154_sub_if_data *sdata, *next;
 269
 270         flush_workqueue(priv->dev_workqueue);
 271         destroy_workqueue(priv->dev_workqueue);
 272
 273         rtnl_lock();
 274
 275         mutex_lock(&priv->slaves_mtx);
 276         priv->running = MAC802154_DEVICE_STOPPED;
 277         mutex_unlock(&priv->slaves_mtx);
 278
 279         list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
 280                 mutex_lock(&sdata->hw->slaves_mtx);
 281                 list_del(&sdata->list);
 282                 mutex_unlock(&sdata->hw->slaves_mtx);
 283
 284                 unregister_netdevice(sdata->dev);
 285         }
 286
 287         rtnl_unlock();
 288
 289         wpan_phy_unregister(priv->phy);
 290 }
 291 EXPORT_SYMBOL(ieee802154_unregister_device);
 292
 293 MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
 294 MODULE_LICENSE("GPL v2");