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  * Written by:
  16  * Sergey Lapin <slapin@ossfans.org>
  17  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  18  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/timer.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/device.h>
  26 #include <linux/spinlock.h>
  27 #include <net/mac802154.h>
  28 #include <net/cfg802154.h>
  29
  30 static int numlbs = 1;
  31
  32 struct fakelb_dev_priv {
  33         struct ieee802154_dev *dev;
  34
  35         struct list_head list;
  36         struct fakelb_priv *fake;
  37
  38         spinlock_t lock;
  39         bool working;
  40 };
  41
  42 struct fakelb_priv {
  43         struct list_head list;
  44         rwlock_t lock;
  45 };
  46
  47 static int
  48 fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level)
  49 {
  50         might_sleep();
  51         BUG_ON(!level);
  52         *level = 0xbe;
  53
  54         return 0;
  55 }
  56
  57 static int
  58 fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
  59 {
  60         pr_debug("set channel to %d\n", channel);
  61
  62         might_sleep();
  63         dev->phy->current_page = page;
  64         dev->phy->current_channel = channel;
  65
  66         return 0;
  67 }
  68
  69 static void
  70 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
  71 {
  72         struct sk_buff *newskb;
  73
  74         spin_lock(&priv->lock);
  75         if (priv->working) {
  76                 newskb = pskb_copy(skb, GFP_ATOMIC);
  77                 ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc);
  78         }
  79         spin_unlock(&priv->lock);
  80 }
  81
  82 static int
  83 fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
  84 {
  85         struct fakelb_dev_priv *priv = dev->priv;
  86         struct fakelb_priv *fake = priv->fake;
  87
  88         might_sleep();
  89
  90         read_lock_bh(&fake->lock);
  91         if (priv->list.next == priv->list.prev) {
  92                 /* we are the only one device */
  93                 fakelb_hw_deliver(priv, skb);
  94         } else {
  95                 struct fakelb_dev_priv *dp;
  96                 list_for_each_entry(dp, &priv->fake->list, list) {
  97                         if (dp != priv &&
  98                             (dp->dev->phy->current_channel ==
  99                              priv->dev->phy->current_channel))
 100                                 fakelb_hw_deliver(dp, skb);
 101                 }
 102         }
 103         read_unlock_bh(&fake->lock);
 104
 105         return 0;
 106 }
 107
 108 static int
 109 fakelb_hw_start(struct ieee802154_dev *dev) {
 110         struct fakelb_dev_priv *priv = dev->priv;
 111         int ret = 0;
 112
 113         spin_lock(&priv->lock);
 114         if (priv->working)
 115                 ret = -EBUSY;
 116         else
 117                 priv->working = 1;
 118         spin_unlock(&priv->lock);
 119
 120         return ret;
 121 }
 122
 123 static void
 124 fakelb_hw_stop(struct ieee802154_dev *dev) {
 125         struct fakelb_dev_priv *priv = dev->priv;
 126
 127         spin_lock(&priv->lock);
 128         priv->working = 0;
 129         spin_unlock(&priv->lock);
 130 }
 131
 132 static struct ieee802154_ops fakelb_ops = {
 133         .owner = THIS_MODULE,
 134         .xmit = fakelb_hw_xmit,
 135         .ed = fakelb_hw_ed,
 136         .set_channel = fakelb_hw_channel,
 137         .start = fakelb_hw_start,
 138         .stop = fakelb_hw_stop,
 139 };
 140
 141 /* Number of dummy devices to be set up by this module. */
 142 module_param(numlbs, int, 0);
 143 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 144
 145 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
 146 {
 147         struct fakelb_dev_priv *priv;
 148         int err;
 149         struct ieee802154_dev *ieee;
 150
 151         ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
 152         if (!ieee)
 153                 return -ENOMEM;
 154
 155         priv = ieee->priv;
 156         priv->dev = ieee;
 157
 158         /* 868 MHz BPSK 802.15.4-2003 */
 159         ieee->phy->channels_supported[0] |= 1;
 160         /* 915 MHz BPSK 802.15.4-2003 */
 161         ieee->phy->channels_supported[0] |= 0x7fe;
 162         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 163         ieee->phy->channels_supported[0] |= 0x7FFF800;
 164         /* 868 MHz ASK 802.15.4-2006 */
 165         ieee->phy->channels_supported[1] |= 1;
 166         /* 915 MHz ASK 802.15.4-2006 */
 167         ieee->phy->channels_supported[1] |= 0x7fe;
 168         /* 868 MHz O-QPSK 802.15.4-2006 */
 169         ieee->phy->channels_supported[2] |= 1;
 170         /* 915 MHz O-QPSK 802.15.4-2006 */
 171         ieee->phy->channels_supported[2] |= 0x7fe;
 172         /* 2.4 GHz CSS 802.15.4a-2007 */
 173         ieee->phy->channels_supported[3] |= 0x3fff;
 174         /* UWB Sub-gigahertz 802.15.4a-2007 */
 175         ieee->phy->channels_supported[4] |= 1;
 176         /* UWB Low band 802.15.4a-2007 */
 177         ieee->phy->channels_supported[4] |= 0x1e;
 178         /* UWB High band 802.15.4a-2007 */
 179         ieee->phy->channels_supported[4] |= 0xffe0;
 180         /* 750 MHz O-QPSK 802.15.4c-2009 */
 181         ieee->phy->channels_supported[5] |= 0xf;
 182         /* 750 MHz MPSK 802.15.4c-2009 */
 183         ieee->phy->channels_supported[5] |= 0xf0;
 184         /* 950 MHz BPSK 802.15.4d-2009 */
 185         ieee->phy->channels_supported[6] |= 0x3ff;
 186         /* 950 MHz GFSK 802.15.4d-2009 */
 187         ieee->phy->channels_supported[6] |= 0x3ffc00;
 188
 189         INIT_LIST_HEAD(&priv->list);
 190         priv->fake = fake;
 191
 192         spin_lock_init(&priv->lock);
 193
 194         ieee->parent = dev;
 195
 196         err = ieee802154_register_device(ieee);
 197         if (err)
 198                 goto err_reg;
 199
 200         write_lock_bh(&fake->lock);
 201         list_add_tail(&priv->list, &fake->list);
 202         write_unlock_bh(&fake->lock);
 203
 204         return 0;
 205
 206 err_reg:
 207         ieee802154_free_device(priv->dev);
 208         return err;
 209 }
 210
 211 static void fakelb_del(struct fakelb_dev_priv *priv)
 212 {
 213         write_lock_bh(&priv->fake->lock);
 214         list_del(&priv->list);
 215         write_unlock_bh(&priv->fake->lock);
 216
 217         ieee802154_unregister_device(priv->dev);
 218         ieee802154_free_device(priv->dev);
 219 }
 220
 221 static int fakelb_probe(struct platform_device *pdev)
 222 {
 223         struct fakelb_priv *priv;
 224         struct fakelb_dev_priv *dp;
 225         int err = -ENOMEM;
 226         int i;
 227
 228         priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
 229                             GFP_KERNEL);
 230         if (!priv)
 231                 goto err_alloc;
 232
 233         INIT_LIST_HEAD(&priv->list);
 234         rwlock_init(&priv->lock);
 235
 236         for (i = 0; i < numlbs; i++) {
 237                 err = fakelb_add_one(&pdev->dev, priv);
 238                 if (err < 0)
 239                         goto err_slave;
 240         }
 241
 242         platform_set_drvdata(pdev, priv);
 243         dev_info(&pdev->dev, "added ieee802154 hardware\n");
 244         return 0;
 245
 246 err_slave:
 247         list_for_each_entry(dp, &priv->list, list)
 248                 fakelb_del(dp);
 249 err_alloc:
 250         return err;
 251 }
 252
 253 static int fakelb_remove(struct platform_device *pdev)
 254 {
 255         struct fakelb_priv *priv = platform_get_drvdata(pdev);
 256         struct fakelb_dev_priv *dp, *temp;
 257
 258         list_for_each_entry_safe(dp, temp, &priv->list, list)
 259                 fakelb_del(dp);
 260
 261         return 0;
 262 }
 263
 264 static struct platform_device *ieee802154fake_dev;
 265
 266 static struct platform_driver ieee802154fake_driver = {
 267         .probe = fakelb_probe,
 268         .remove = fakelb_remove,
 269         .driver = {
 270                         .name = "ieee802154fakelb",
 271                         .owner = THIS_MODULE,
 272         },
 273 };
 274
 275 static __init int fakelb_init_module(void)
 276 {
 277         ieee802154fake_dev = platform_device_register_simple(
 278                              "ieee802154fakelb", -1, NULL, 0);
 279         return platform_driver_register(&ieee802154fake_driver);
 280 }
 281
 282 static __exit void fake_remove_module(void)
 283 {
 284         platform_driver_unregister(&ieee802154fake_driver);
 285         platform_device_unregister(ieee802154fake_dev);
 286 }
 287
 288 module_init(fakelb_init_module);
 289 module_exit(fake_remove_module);
 290 MODULE_LICENSE("GPL");