kernel/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_hw *hw;
  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_hw *hw, u8 *level)
  49 {
  50         BUG_ON(!level);
  51         *level = 0xbe;
  52
  53         return 0;
  54 }
  55
  56 static int
  57 fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
  58 {
  59         pr_debug("set channel to %d\n", channel);
  60
  61         return 0;
  62 }
  63
  64 static void
  65 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
  66 {
  67         struct sk_buff *newskb;
  68
  69         spin_lock(&priv->lock);
  70         if (priv->working) {
  71                 newskb = pskb_copy(skb, GFP_ATOMIC);
  72                 ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
  73         }
  74         spin_unlock(&priv->lock);
  75 }
  76
  77 static int
  78 fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
  79 {
  80         struct fakelb_dev_priv *priv = hw->priv;
  81         struct fakelb_priv *fake = priv->fake;
  82
  83         read_lock_bh(&fake->lock);
  84         if (priv->list.next == priv->list.prev) {
  85                 /* we are the only one device */
  86                 fakelb_hw_deliver(priv, skb);
  87         } else {
  88                 struct fakelb_dev_priv *dp;
  89                 list_for_each_entry(dp, &priv->fake->list, list) {
  90                         if (dp != priv &&
  91                             (dp->hw->phy->current_channel ==
  92                              priv->hw->phy->current_channel))
  93                                 fakelb_hw_deliver(dp, skb);
  94                 }
  95         }
  96         read_unlock_bh(&fake->lock);
  97
  98         return 0;
  99 }
 100
 101 static int
 102 fakelb_hw_start(struct ieee802154_hw *hw) {
 103         struct fakelb_dev_priv *priv = hw->priv;
 104         int ret = 0;
 105
 106         spin_lock(&priv->lock);
 107         if (priv->working)
 108                 ret = -EBUSY;
 109         else
 110                 priv->working = 1;
 111         spin_unlock(&priv->lock);
 112
 113         return ret;
 114 }
 115
 116 static void
 117 fakelb_hw_stop(struct ieee802154_hw *hw) {
 118         struct fakelb_dev_priv *priv = hw->priv;
 119
 120         spin_lock(&priv->lock);
 121         priv->working = 0;
 122         spin_unlock(&priv->lock);
 123 }
 124
 125 static const struct ieee802154_ops fakelb_ops = {
 126         .owner = THIS_MODULE,
 127         .xmit_sync = fakelb_hw_xmit,
 128         .ed = fakelb_hw_ed,
 129         .set_channel = fakelb_hw_channel,
 130         .start = fakelb_hw_start,
 131         .stop = fakelb_hw_stop,
 132 };
 133
 134 /* Number of dummy devices to be set up by this module. */
 135 module_param(numlbs, int, 0);
 136 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 137
 138 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
 139 {
 140         struct fakelb_dev_priv *priv;
 141         int err;
 142         struct ieee802154_hw *hw;
 143
 144         hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
 145         if (!hw)
 146                 return -ENOMEM;
 147
 148         priv = hw->priv;
 149         priv->hw = hw;
 150
 151         /* 868 MHz BPSK 802.15.4-2003 */
 152         hw->phy->channels_supported[0] |= 1;
 153         /* 915 MHz BPSK 802.15.4-2003 */
 154         hw->phy->channels_supported[0] |= 0x7fe;
 155         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 156         hw->phy->channels_supported[0] |= 0x7FFF800;
 157         /* 868 MHz ASK 802.15.4-2006 */
 158         hw->phy->channels_supported[1] |= 1;
 159         /* 915 MHz ASK 802.15.4-2006 */
 160         hw->phy->channels_supported[1] |= 0x7fe;
 161         /* 868 MHz O-QPSK 802.15.4-2006 */
 162         hw->phy->channels_supported[2] |= 1;
 163         /* 915 MHz O-QPSK 802.15.4-2006 */
 164         hw->phy->channels_supported[2] |= 0x7fe;
 165         /* 2.4 GHz CSS 802.15.4a-2007 */
 166         hw->phy->channels_supported[3] |= 0x3fff;
 167         /* UWB Sub-gigahertz 802.15.4a-2007 */
 168         hw->phy->channels_supported[4] |= 1;
 169         /* UWB Low band 802.15.4a-2007 */
 170         hw->phy->channels_supported[4] |= 0x1e;
 171         /* UWB High band 802.15.4a-2007 */
 172         hw->phy->channels_supported[4] |= 0xffe0;
 173         /* 750 MHz O-QPSK 802.15.4c-2009 */
 174         hw->phy->channels_supported[5] |= 0xf;
 175         /* 750 MHz MPSK 802.15.4c-2009 */
 176         hw->phy->channels_supported[5] |= 0xf0;
 177         /* 950 MHz BPSK 802.15.4d-2009 */
 178         hw->phy->channels_supported[6] |= 0x3ff;
 179         /* 950 MHz GFSK 802.15.4d-2009 */
 180         hw->phy->channels_supported[6] |= 0x3ffc00;
 181
 182         INIT_LIST_HEAD(&priv->list);
 183         priv->fake = fake;
 184
 185         spin_lock_init(&priv->lock);
 186
 187         hw->parent = dev;
 188
 189         err = ieee802154_register_hw(hw);
 190         if (err)
 191                 goto err_reg;
 192
 193         write_lock_bh(&fake->lock);
 194         list_add_tail(&priv->list, &fake->list);
 195         write_unlock_bh(&fake->lock);
 196
 197         return 0;
 198
 199 err_reg:
 200         ieee802154_free_hw(priv->hw);
 201         return err;
 202 }
 203
 204 static void fakelb_del(struct fakelb_dev_priv *priv)
 205 {
 206         write_lock_bh(&priv->fake->lock);
 207         list_del(&priv->list);
 208         write_unlock_bh(&priv->fake->lock);
 209
 210         ieee802154_unregister_hw(priv->hw);
 211         ieee802154_free_hw(priv->hw);
 212 }
 213
 214 static int fakelb_probe(struct platform_device *pdev)
 215 {
 216         struct fakelb_priv *priv;
 217         struct fakelb_dev_priv *dp;
 218         int err = -ENOMEM;
 219         int i;
 220
 221         priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
 222                             GFP_KERNEL);
 223         if (!priv)
 224                 goto err_alloc;
 225
 226         INIT_LIST_HEAD(&priv->list);
 227         rwlock_init(&priv->lock);
 228
 229         for (i = 0; i < numlbs; i++) {
 230                 err = fakelb_add_one(&pdev->dev, priv);
 231                 if (err < 0)
 232                         goto err_slave;
 233         }
 234
 235         platform_set_drvdata(pdev, priv);
 236         dev_info(&pdev->dev, "added ieee802154 hardware\n");
 237         return 0;
 238
 239 err_slave:
 240         list_for_each_entry(dp, &priv->list, list)
 241                 fakelb_del(dp);
 242 err_alloc:
 243         return err;
 244 }
 245
 246 static int fakelb_remove(struct platform_device *pdev)
 247 {
 248         struct fakelb_priv *priv = platform_get_drvdata(pdev);
 249         struct fakelb_dev_priv *dp, *temp;
 250
 251         list_for_each_entry_safe(dp, temp, &priv->list, list)
 252                 fakelb_del(dp);
 253
 254         return 0;
 255 }
 256
 257 static struct platform_device *ieee802154fake_dev;
 258
 259 static struct platform_driver ieee802154fake_driver = {
 260         .probe = fakelb_probe,
 261         .remove = fakelb_remove,
 262         .driver = {
 263                         .name = "ieee802154fakelb",
 264         },
 265 };
 266
 267 static __init int fakelb_init_module(void)
 268 {
 269         ieee802154fake_dev = platform_device_register_simple(
 270                              "ieee802154fakelb", -1, NULL, 0);
 271         return platform_driver_register(&ieee802154fake_driver);
 272 }
 273
 274 static __exit void fake_remove_module(void)
 275 {
 276         platform_driver_unregister(&ieee802154fake_driver);
 277         platform_device_unregister(ieee802154fake_dev);
 278 }
 279
 280 module_init(fakelb_init_module);
 281 module_exit(fake_remove_module);
 282 MODULE_LICENSE("GPL");