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/device.h>
  30 #include <linux/spinlock.h>
  31 #include <net/mac802154.h>
  32 #include <net/wpan-phy.h>
  33
  34 static int numlbs = 1;
  35
  36 struct fakelb_dev_priv {
  37         struct ieee802154_dev *dev;
  38
  39         struct list_head list;
  40         struct fakelb_priv *fake;
  41
  42         spinlock_t lock;
  43         bool working;
  44 };
  45
  46 struct fakelb_priv {
  47         struct list_head list;
  48         rwlock_t lock;
  49 };
  50
  51 static int
  52 fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level)
  53 {
  54         might_sleep();
  55         BUG_ON(!level);
  56         *level = 0xbe;
  57
  58         return 0;
  59 }
  60
  61 static int
  62 fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
  63 {
  64         pr_debug("set channel to %d\n", channel);
  65
  66         might_sleep();
  67         dev->phy->current_page = page;
  68         dev->phy->current_channel = channel;
  69
  70         return 0;
  71 }
  72
  73 static void
  74 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
  75 {
  76         struct sk_buff *newskb;
  77
  78         spin_lock(&priv->lock);
  79         if (priv->working) {
  80                 newskb = pskb_copy(skb, GFP_ATOMIC);
  81                 ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc);
  82         }
  83         spin_unlock(&priv->lock);
  84 }
  85
  86 static int
  87 fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
  88 {
  89         struct fakelb_dev_priv *priv = dev->priv;
  90         struct fakelb_priv *fake = priv->fake;
  91
  92         might_sleep();
  93
  94         read_lock_bh(&fake->lock);
  95         if (priv->list.next == priv->list.prev) {
  96                 /* we are the only one device */
  97                 fakelb_hw_deliver(priv, skb);
  98         } else {
  99                 struct fakelb_dev_priv *dp;
 100                 list_for_each_entry(dp, &priv->fake->list, list) {
 101                         if (dp != priv &&
 102                             (dp->dev->phy->current_channel ==
 103                              priv->dev->phy->current_channel))
 104                                 fakelb_hw_deliver(dp, skb);
 105                 }
 106         }
 107         read_unlock_bh(&fake->lock);
 108
 109         return 0;
 110 }
 111
 112 static int
 113 fakelb_hw_start(struct ieee802154_dev *dev) {
 114         struct fakelb_dev_priv *priv = dev->priv;
 115         int ret = 0;
 116
 117         spin_lock(&priv->lock);
 118         if (priv->working)
 119                 ret = -EBUSY;
 120         else
 121                 priv->working = 1;
 122         spin_unlock(&priv->lock);
 123
 124         return ret;
 125 }
 126
 127 static void
 128 fakelb_hw_stop(struct ieee802154_dev *dev) {
 129         struct fakelb_dev_priv *priv = dev->priv;
 130
 131         spin_lock(&priv->lock);
 132         priv->working = 0;
 133         spin_unlock(&priv->lock);
 134 }
 135
 136 static struct ieee802154_ops fakelb_ops = {
 137         .owner = THIS_MODULE,
 138         .xmit = fakelb_hw_xmit,
 139         .ed = fakelb_hw_ed,
 140         .set_channel = fakelb_hw_channel,
 141         .start = fakelb_hw_start,
 142         .stop = fakelb_hw_stop,
 143 };
 144
 145 /* Number of dummy devices to be set up by this module. */
 146 module_param(numlbs, int, 0);
 147 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 148
 149 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
 150 {
 151         struct fakelb_dev_priv *priv;
 152         int err;
 153         struct ieee802154_dev *ieee;
 154
 155         ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
 156         if (!ieee)
 157                 return -ENOMEM;
 158
 159         priv = ieee->priv;
 160         priv->dev = ieee;
 161
 162         /* 868 MHz BPSK 802.15.4-2003 */
 163         ieee->phy->channels_supported[0] |= 1;
 164         /* 915 MHz BPSK 802.15.4-2003 */
 165         ieee->phy->channels_supported[0] |= 0x7fe;
 166         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 167         ieee->phy->channels_supported[0] |= 0x7FFF800;
 168         /* 868 MHz ASK 802.15.4-2006 */
 169         ieee->phy->channels_supported[1] |= 1;
 170         /* 915 MHz ASK 802.15.4-2006 */
 171         ieee->phy->channels_supported[1] |= 0x7fe;
 172         /* 868 MHz O-QPSK 802.15.4-2006 */
 173         ieee->phy->channels_supported[2] |= 1;
 174         /* 915 MHz O-QPSK 802.15.4-2006 */
 175         ieee->phy->channels_supported[2] |= 0x7fe;
 176         /* 2.4 GHz CSS 802.15.4a-2007 */
 177         ieee->phy->channels_supported[3] |= 0x3fff;
 178         /* UWB Sub-gigahertz 802.15.4a-2007 */
 179         ieee->phy->channels_supported[4] |= 1;
 180         /* UWB Low band 802.15.4a-2007 */
 181         ieee->phy->channels_supported[4] |= 0x1e;
 182         /* UWB High band 802.15.4a-2007 */
 183         ieee->phy->channels_supported[4] |= 0xffe0;
 184         /* 750 MHz O-QPSK 802.15.4c-2009 */
 185         ieee->phy->channels_supported[5] |= 0xf;
 186         /* 750 MHz MPSK 802.15.4c-2009 */
 187         ieee->phy->channels_supported[5] |= 0xf0;
 188         /* 950 MHz BPSK 802.15.4d-2009 */
 189         ieee->phy->channels_supported[6] |= 0x3ff;
 190         /* 950 MHz GFSK 802.15.4d-2009 */
 191         ieee->phy->channels_supported[6] |= 0x3ffc00;
 192
 193         INIT_LIST_HEAD(&priv->list);
 194         priv->fake = fake;
 195
 196         spin_lock_init(&priv->lock);
 197
 198         ieee->parent = dev;
 199
 200         err = ieee802154_register_device(ieee);
 201         if (err)
 202                 goto err_reg;
 203
 204         write_lock_bh(&fake->lock);
 205         list_add_tail(&priv->list, &fake->list);
 206         write_unlock_bh(&fake->lock);
 207
 208         return 0;
 209
 210 err_reg:
 211         ieee802154_free_device(priv->dev);
 212         return err;
 213 }
 214
 215 static void fakelb_del(struct fakelb_dev_priv *priv)
 216 {
 217         write_lock_bh(&priv->fake->lock);
 218         list_del(&priv->list);
 219         write_unlock_bh(&priv->fake->lock);
 220
 221         ieee802154_unregister_device(priv->dev);
 222         ieee802154_free_device(priv->dev);
 223 }
 224
 225 static int fakelb_probe(struct platform_device *pdev)
 226 {
 227         struct fakelb_priv *priv;
 228         struct fakelb_dev_priv *dp;
 229         int err = -ENOMEM;
 230         int i;
 231
 232         priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
 233                             GFP_KERNEL);
 234         if (!priv)
 235                 goto err_alloc;
 236
 237         INIT_LIST_HEAD(&priv->list);
 238         rwlock_init(&priv->lock);
 239
 240         for (i = 0; i < numlbs; i++) {
 241                 err = fakelb_add_one(&pdev->dev, priv);
 242                 if (err < 0)
 243                         goto err_slave;
 244         }
 245
 246         platform_set_drvdata(pdev, priv);
 247         dev_info(&pdev->dev, "added ieee802154 hardware\n");
 248         return 0;
 249
 250 err_slave:
 251         list_for_each_entry(dp, &priv->list, list)
 252                 fakelb_del(dp);
 253 err_alloc:
 254         return err;
 255 }
 256
 257 static int fakelb_remove(struct platform_device *pdev)
 258 {
 259         struct fakelb_priv *priv = platform_get_drvdata(pdev);
 260         struct fakelb_dev_priv *dp, *temp;
 261
 262         list_for_each_entry_safe(dp, temp, &priv->list, list)
 263                 fakelb_del(dp);
 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");