drivers/net/ieee802154/fakelb.c

   1 /*
   2  * Loopback IEEE 802.15.4 interface
   3  *
   4  * Copyright 2007-2012 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Written by:
  20  * Sergey Lapin <slapin@ossfans.org>
  21  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  22  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/timer.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/spinlock.h>
  30 #include <net/mac802154.h>
  31 #include <net/wpan-phy.h>
  32
  33 static int numlbs = 1;
  34
  35 struct fakelb_dev_priv {
  36         struct ieee802154_dev *dev;
  37
  38         struct list_head list;
  39         struct fakelb_priv *fake;
  40
  41         spinlock_t lock;
  42         bool working;
  43 };
  44
  45 struct fakelb_priv {
  46         struct list_head list;
  47         rwlock_t lock;
  48 };
  49
  50 static int
  51 fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level)
  52 {
  53         might_sleep();
  54         BUG_ON(!level);
  55         *level = 0xbe;
  56
  57         return 0;
  58 }
  59
  60 static int
  61 fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
  62 {
  63         pr_debug("set channel to %d\n", channel);
  64
  65         might_sleep();
  66         dev->phy->current_page = page;
  67         dev->phy->current_channel = channel;
  68
  69         return 0;
  70 }
  71
  72 static void
  73 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
  74 {
  75         struct sk_buff *newskb;
  76
  77         spin_lock(&priv->lock);
  78         if (priv->working) {
  79                 newskb = pskb_copy(skb, GFP_ATOMIC);
  80                 ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc);
  81         }
  82         spin_unlock(&priv->lock);
  83 }
  84
  85 static int
  86 fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
  87 {
  88         struct fakelb_dev_priv *priv = dev->priv;
  89         struct fakelb_priv *fake = priv->fake;
  90
  91         might_sleep();
  92
  93         read_lock_bh(&fake->lock);
  94         if (priv->list.next == priv->list.prev) {
  95                 /* we are the only one device */
  96                 fakelb_hw_deliver(priv, skb);
  97         } else {
  98                 struct fakelb_dev_priv *dp;
  99                 list_for_each_entry(dp, &priv->fake->list, list) {
 100                         if (dp != priv &&
 101                             (dp->dev->phy->current_channel ==
 102                              priv->dev->phy->current_channel))
 103                                 fakelb_hw_deliver(dp, skb);
 104                 }
 105         }
 106         read_unlock_bh(&fake->lock);
 107
 108         return 0;
 109 }
 110
 111 static int
 112 fakelb_hw_start(struct ieee802154_dev *dev) {
 113         struct fakelb_dev_priv *priv = dev->priv;
 114         int ret = 0;
 115
 116         spin_lock(&priv->lock);
 117         if (priv->working)
 118                 ret = -EBUSY;
 119         else
 120                 priv->working = 1;
 121         spin_unlock(&priv->lock);
 122
 123         return ret;
 124 }
 125
 126 static void
 127 fakelb_hw_stop(struct ieee802154_dev *dev) {
 128         struct fakelb_dev_priv *priv = dev->priv;
 129
 130         spin_lock(&priv->lock);
 131         priv->working = 0;
 132         spin_unlock(&priv->lock);
 133 }
 134
 135 static struct ieee802154_ops fakelb_ops = {
 136         .owner = THIS_MODULE,
 137         .xmit = fakelb_hw_xmit,
 138         .ed = fakelb_hw_ed,
 139         .set_channel = fakelb_hw_channel,
 140         .start = fakelb_hw_start,
 141         .stop = fakelb_hw_stop,
 142 };
 143
 144 /* Number of dummy devices to be set up by this module. */
 145 module_param(numlbs, int, 0);
 146 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 147
 148 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
 149 {
 150         struct fakelb_dev_priv *priv;
 151         int err;
 152         struct ieee802154_dev *ieee;
 153
 154         ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
 155         if (!ieee)
 156                 return -ENOMEM;
 157
 158         priv = ieee->priv;
 159         priv->dev = ieee;
 160
 161         /* 868 MHz BPSK 802.15.4-2003 */
 162         ieee->phy->channels_supported[0] |= 1;
 163         /* 915 MHz BPSK 802.15.4-2003 */
 164         ieee->phy->channels_supported[0] |= 0x7fe;
 165         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 166         ieee->phy->channels_supported[0] |= 0x7FFF800;
 167         /* 868 MHz ASK 802.15.4-2006 */
 168         ieee->phy->channels_supported[1] |= 1;
 169         /* 915 MHz ASK 802.15.4-2006 */
 170         ieee->phy->channels_supported[1] |= 0x7fe;
 171         /* 868 MHz O-QPSK 802.15.4-2006 */
 172         ieee->phy->channels_supported[2] |= 1;
 173         /* 915 MHz O-QPSK 802.15.4-2006 */
 174         ieee->phy->channels_supported[2] |= 0x7fe;
 175         /* 2.4 GHz CSS 802.15.4a-2007 */
 176         ieee->phy->channels_supported[3] |= 0x3fff;
 177         /* UWB Sub-gigahertz 802.15.4a-2007 */
 178         ieee->phy->channels_supported[4] |= 1;
 179         /* UWB Low band 802.15.4a-2007 */
 180         ieee->phy->channels_supported[4] |= 0x1e;
 181         /* UWB High band 802.15.4a-2007 */
 182         ieee->phy->channels_supported[4] |= 0xffe0;
 183         /* 750 MHz O-QPSK 802.15.4c-2009 */
 184         ieee->phy->channels_supported[5] |= 0xf;
 185         /* 750 MHz MPSK 802.15.4c-2009 */
 186         ieee->phy->channels_supported[5] |= 0xf0;
 187         /* 950 MHz BPSK 802.15.4d-2009 */
 188         ieee->phy->channels_supported[6] |= 0x3ff;
 189         /* 950 MHz GFSK 802.15.4d-2009 */
 190         ieee->phy->channels_supported[6] |= 0x3ffc00;
 191
 192         INIT_LIST_HEAD(&priv->list);
 193         priv->fake = fake;
 194
 195         spin_lock_init(&priv->lock);
 196
 197         ieee->parent = dev;
 198
 199         err = ieee802154_register_device(ieee);
 200         if (err)
 201                 goto err_reg;
 202
 203         write_lock_bh(&fake->lock);
 204         list_add_tail(&priv->list, &fake->list);
 205         write_unlock_bh(&fake->lock);
 206
 207         return 0;
 208
 209 err_reg:
 210         ieee802154_free_device(priv->dev);
 211         return err;
 212 }
 213
 214 static void fakelb_del(struct fakelb_dev_priv *priv)
 215 {
 216         write_lock_bh(&priv->fake->lock);
 217         list_del(&priv->list);
 218         write_unlock_bh(&priv->fake->lock);
 219
 220         ieee802154_unregister_device(priv->dev);
 221         ieee802154_free_device(priv->dev);
 222 }
 223
 224 static int fakelb_probe(struct platform_device *pdev)
 225 {
 226         struct fakelb_priv *priv;
 227         struct fakelb_dev_priv *dp;
 228         int err = -ENOMEM;
 229         int i;
 230
 231         priv = kzalloc(sizeof(struct fakelb_priv), GFP_KERNEL);
 232         if (!priv)
 233                 goto err_alloc;
 234
 235         INIT_LIST_HEAD(&priv->list);
 236         rwlock_init(&priv->lock);
 237
 238         for (i = 0; i < numlbs; i++) {
 239                 err = fakelb_add_one(&pdev->dev, priv);
 240                 if (err < 0)
 241                         goto err_slave;
 242         }
 243
 244         platform_set_drvdata(pdev, priv);
 245         dev_info(&pdev->dev, "added ieee802154 hardware\n");
 246         return 0;
 247
 248 err_slave:
 249         list_for_each_entry(dp, &priv->list, list)
 250                 fakelb_del(dp);
 251         kfree(priv);
 252 err_alloc:
 253         return err;
 254 }
 255
 256 static int fakelb_remove(struct platform_device *pdev)
 257 {
 258         struct fakelb_priv *priv = platform_get_drvdata(pdev);
 259         struct fakelb_dev_priv *dp, *temp;
 260
 261         list_for_each_entry_safe(dp, temp, &priv->list, list)
 262                 fakelb_del(dp);
 263         kfree(priv);
 264
 265         return 0;
 266 }
 267
 268 static struct platform_device *ieee802154fake_dev;
 269
 270 static struct platform_driver ieee802154fake_driver = {
 271         .probe = fakelb_probe,
 272         .remove = fakelb_remove,
 273         .driver = {
 274                         .name = "ieee802154fakelb",
 275                         .owner = THIS_MODULE,
 276         },
 277 };
 278
 279 static __init int fakelb_init_module(void)
 280 {
 281         ieee802154fake_dev = platform_device_register_simple(
 282                              "ieee802154fakelb", -1, NULL, 0);
 283         return platform_driver_register(&ieee802154fake_driver);
 284 }
 285
 286 static __exit void fake_remove_module(void)
 287 {
 288         platform_driver_unregister(&ieee802154fake_driver);
 289         platform_device_unregister(ieee802154fake_dev);
 290 }
 291
 292 module_init(fakelb_init_module);
 293 module_exit(fake_remove_module);
 294 MODULE_LICENSE("GPL");