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/ieee802154_netdev.h>
  31 #include <net/route.h>
  32 #include <net/wpan-phy.h>
  33
  34 #include "mac802154.h"
  35
  36 int mac802154_slave_open(struct net_device *dev)
  37 {
  38         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  39         struct mac802154_sub_if_data *subif;
  40         struct mac802154_priv *ipriv = priv->hw;
  41         int res = 0;
  42
  43         ASSERT_RTNL();
  44
  45         if (priv->type == IEEE802154_DEV_WPAN) {
  46                 mutex_lock(&priv->hw->slaves_mtx);
  47                 list_for_each_entry(subif, &priv->hw->slaves, list) {
  48                         if (subif != priv && subif->type == priv->type &&
  49                             subif->running) {
  50                                 mutex_unlock(&priv->hw->slaves_mtx);
  51                                 return -EBUSY;
  52                         }
  53                 }
  54                 mutex_unlock(&priv->hw->slaves_mtx);
  55         }
  56
  57         mutex_lock(&priv->hw->slaves_mtx);
  58         priv->running = true;
  59         mutex_unlock(&priv->hw->slaves_mtx);
  60
  61         if (ipriv->open_count++ == 0) {
  62                 res = ipriv->ops->start(&ipriv->hw);
  63                 WARN_ON(res);
  64                 if (res)
  65                         goto err;
  66         }
  67
  68         if (ipriv->ops->ieee_addr) {
  69                 __le64 addr = ieee802154_devaddr_from_raw(dev->dev_addr);
  70
  71                 res = ipriv->ops->ieee_addr(&ipriv->hw, addr);
  72                 WARN_ON(res);
  73                 if (res)
  74                         goto err;
  75                 mac802154_dev_set_ieee_addr(dev);
  76         }
  77
  78         netif_start_queue(dev);
  79         return 0;
  80 err:
  81         priv->hw->open_count--;
  82
  83         return res;
  84 }
  85
  86 int mac802154_slave_close(struct net_device *dev)
  87 {
  88         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  89         struct mac802154_priv *ipriv = priv->hw;
  90
  91         ASSERT_RTNL();
  92
  93         netif_stop_queue(dev);
  94
  95         mutex_lock(&priv->hw->slaves_mtx);
  96         priv->running = false;
  97         mutex_unlock(&priv->hw->slaves_mtx);
  98
  99         if (!--ipriv->open_count)
 100                 ipriv->ops->stop(&ipriv->hw);
 101
 102         return 0;
 103 }
 104
 105 static int
 106 mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
 107 {
 108         struct mac802154_sub_if_data *priv;
 109         struct mac802154_priv *ipriv;
 110         int err;
 111
 112         ipriv = wpan_phy_priv(phy);
 113
 114         priv = netdev_priv(dev);
 115         priv->dev = dev;
 116         priv->hw = ipriv;
 117
 118         dev->needed_headroom = ipriv->hw.extra_tx_headroom;
 119
 120         SET_NETDEV_DEV(dev, &ipriv->phy->dev);
 121
 122         mutex_lock(&ipriv->slaves_mtx);
 123         if (!ipriv->running) {
 124                 mutex_unlock(&ipriv->slaves_mtx);
 125                 return -ENODEV;
 126         }
 127         mutex_unlock(&ipriv->slaves_mtx);
 128
 129         err = register_netdev(dev);
 130         if (err < 0)
 131                 return err;
 132
 133         rtnl_lock();
 134         mutex_lock(&ipriv->slaves_mtx);
 135         list_add_tail_rcu(&priv->list, &ipriv->slaves);
 136         mutex_unlock(&ipriv->slaves_mtx);
 137         rtnl_unlock();
 138
 139         return 0;
 140 }
 141
 142 static void
 143 mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
 144 {
 145         struct mac802154_sub_if_data *sdata;
 146         ASSERT_RTNL();
 147
 148         sdata = netdev_priv(dev);
 149
 150         BUG_ON(sdata->hw->phy != phy);
 151
 152         mutex_lock(&sdata->hw->slaves_mtx);
 153         list_del_rcu(&sdata->list);
 154         mutex_unlock(&sdata->hw->slaves_mtx);
 155
 156         synchronize_rcu();
 157         unregister_netdevice(sdata->dev);
 158 }
 159
 160 static struct net_device *
 161 mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
 162 {
 163         struct net_device *dev;
 164         int err = -ENOMEM;
 165
 166         switch (type) {
 167         case IEEE802154_DEV_MONITOR:
 168                 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
 169                                    name, mac802154_monitor_setup);
 170                 break;
 171         case IEEE802154_DEV_WPAN:
 172                 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
 173                                    name, mac802154_wpan_setup);
 174                 break;
 175         default:
 176                 dev = NULL;
 177                 err = -EINVAL;
 178                 break;
 179         }
 180         if (!dev)
 181                 goto err;
 182
 183         err = mac802154_netdev_register(phy, dev);
 184         if (err)
 185                 goto err_free;
 186
 187         dev_hold(dev); /* we return an incremented device refcount */
 188         return dev;
 189
 190 err_free:
 191         free_netdev(dev);
 192 err:
 193         return ERR_PTR(err);
 194 }
 195
 196 static int mac802154_set_txpower(struct wpan_phy *phy, int db)
 197 {
 198         struct mac802154_priv *priv = wpan_phy_priv(phy);
 199
 200         return priv->ops->set_txpower(&priv->hw, db);
 201 }
 202
 203 static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
 204 {
 205         struct mac802154_priv *priv = wpan_phy_priv(phy);
 206
 207         return priv->ops->set_lbt(&priv->hw, on);
 208 }
 209
 210 static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
 211 {
 212         struct mac802154_priv *priv = wpan_phy_priv(phy);
 213
 214         return priv->ops->set_cca_mode(&priv->hw, mode);
 215 }
 216
 217 static int mac802154_set_cca_ed_level(struct wpan_phy *phy, s32 level)
 218 {
 219         struct mac802154_priv *priv = wpan_phy_priv(phy);
 220
 221         return priv->ops->set_cca_ed_level(&priv->hw, level);
 222 }
 223
 224 static int mac802154_set_csma_params(struct wpan_phy *phy, u8 min_be,
 225                                      u8 max_be, u8 retries)
 226 {
 227         struct mac802154_priv *priv = wpan_phy_priv(phy);
 228
 229         return priv->ops->set_csma_params(&priv->hw, min_be, max_be, retries);
 230 }
 231
 232 static int mac802154_set_frame_retries(struct wpan_phy *phy, s8 retries)
 233 {
 234         struct mac802154_priv *priv = wpan_phy_priv(phy);
 235
 236         return priv->ops->set_frame_retries(&priv->hw, retries);
 237 }
 238
 239 struct ieee802154_dev *
 240 ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
 241 {
 242         struct wpan_phy *phy;
 243         struct mac802154_priv *priv;
 244         size_t priv_size;
 245
 246         if (!ops || !ops->xmit || !ops->ed || !ops->start ||
 247             !ops->stop || !ops->set_channel) {
 248                 pr_err("undefined IEEE802.15.4 device operations\n");
 249                 return NULL;
 250         }
 251
 252         /* Ensure 32-byte alignment of our private data and hw private data.
 253          * We use the wpan_phy priv data for both our mac802154_priv and for
 254          * the driver's private data
 255          *
 256          * in memory it'll be like this:
 257          *
 258          * +-----------------------+
 259          * | struct wpan_phy       |
 260          * +-----------------------+
 261          * | struct mac802154_priv |
 262          * +-----------------------+
 263          * | driver's private data |
 264          * +-----------------------+
 265          *
 266          * Due to ieee802154 layer isn't aware of driver and MAC structures,
 267          * so lets allign them here.
 268          */
 269
 270         priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
 271
 272         phy = wpan_phy_alloc(priv_size);
 273         if (!phy) {
 274                 pr_err("failure to allocate master IEEE802.15.4 device\n");
 275                 return NULL;
 276         }
 277
 278         priv = wpan_phy_priv(phy);
 279         priv->hw.phy = priv->phy = phy;
 280         priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
 281         priv->ops = ops;
 282
 283         INIT_LIST_HEAD(&priv->slaves);
 284         mutex_init(&priv->slaves_mtx);
 285
 286         return &priv->hw;
 287 }
 288 EXPORT_SYMBOL(ieee802154_alloc_device);
 289
 290 void ieee802154_free_device(struct ieee802154_dev *hw)
 291 {
 292         struct mac802154_priv *priv = mac802154_to_priv(hw);
 293
 294         BUG_ON(!list_empty(&priv->slaves));
 295
 296         mutex_destroy(&priv->slaves_mtx);
 297
 298         wpan_phy_free(priv->phy);
 299 }
 300 EXPORT_SYMBOL(ieee802154_free_device);
 301
 302 int ieee802154_register_device(struct ieee802154_dev *dev)
 303 {
 304         struct mac802154_priv *priv = mac802154_to_priv(dev);
 305         int rc = -ENOMEM;
 306
 307         priv->dev_workqueue =
 308                 create_singlethread_workqueue(wpan_phy_name(priv->phy));
 309         if (!priv->dev_workqueue)
 310                 goto out;
 311
 312         wpan_phy_set_dev(priv->phy, priv->hw.parent);
 313
 314         priv->phy->add_iface = mac802154_add_iface;
 315         priv->phy->del_iface = mac802154_del_iface;
 316         if (priv->ops->set_txpower)
 317                 priv->phy->set_txpower = mac802154_set_txpower;
 318         if (priv->ops->set_lbt)
 319                 priv->phy->set_lbt = mac802154_set_lbt;
 320         if (priv->ops->set_cca_mode)
 321                 priv->phy->set_cca_mode = mac802154_set_cca_mode;
 322         if (priv->ops->set_cca_ed_level)
 323                 priv->phy->set_cca_ed_level = mac802154_set_cca_ed_level;
 324         if (priv->ops->set_csma_params)
 325                 priv->phy->set_csma_params = mac802154_set_csma_params;
 326         if (priv->ops->set_frame_retries)
 327                 priv->phy->set_frame_retries = mac802154_set_frame_retries;
 328
 329         rc = wpan_phy_register(priv->phy);
 330         if (rc < 0)
 331                 goto out_wq;
 332
 333         rtnl_lock();
 334
 335         mutex_lock(&priv->slaves_mtx);
 336         priv->running = MAC802154_DEVICE_RUN;
 337         mutex_unlock(&priv->slaves_mtx);
 338
 339         rtnl_unlock();
 340
 341         return 0;
 342
 343 out_wq:
 344         destroy_workqueue(priv->dev_workqueue);
 345 out:
 346         return rc;
 347 }
 348 EXPORT_SYMBOL(ieee802154_register_device);
 349
 350 void ieee802154_unregister_device(struct ieee802154_dev *dev)
 351 {
 352         struct mac802154_priv *priv = mac802154_to_priv(dev);
 353         struct mac802154_sub_if_data *sdata, *next;
 354
 355         flush_workqueue(priv->dev_workqueue);
 356         destroy_workqueue(priv->dev_workqueue);
 357
 358         rtnl_lock();
 359
 360         mutex_lock(&priv->slaves_mtx);
 361         priv->running = MAC802154_DEVICE_STOPPED;
 362         mutex_unlock(&priv->slaves_mtx);
 363
 364         list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
 365                 mutex_lock(&sdata->hw->slaves_mtx);
 366                 list_del(&sdata->list);
 367                 mutex_unlock(&sdata->hw->slaves_mtx);
 368
 369                 unregister_netdevice(sdata->dev);
 370         }
 371
 372         rtnl_unlock();
 373
 374         wpan_phy_unregister(priv->phy);
 375 }
 376 EXPORT_SYMBOL(ieee802154_unregister_device);
 377
 378 MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
 379 MODULE_LICENSE("GPL v2");