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 = 2;
  31
  32 static LIST_HEAD(fakelb_phys);
  33 static DEFINE_SPINLOCK(fakelb_phys_lock);
  34
  35 static LIST_HEAD(fakelb_ifup_phys);
  36 static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
  37
  38 struct fakelb_phy {
  39         struct ieee802154_hw *hw;
  40
  41         u8 page;
  42         u8 channel;
  43
  44         bool suspended;
  45
  46         struct list_head list;
  47         struct list_head list_ifup;
  48 };
  49
  50 static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
  51 {
  52         BUG_ON(!level);
  53         *level = 0xbe;
  54
  55         return 0;
  56 }
  57
  58 static int fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
  59 {
  60         struct fakelb_phy *phy = hw->priv;
  61
  62         write_lock_bh(&fakelb_ifup_phys_lock);
  63         phy->page = page;
  64         phy->channel = channel;
  65         write_unlock_bh(&fakelb_ifup_phys_lock);
  66         return 0;
  67 }
  68
  69 static int fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
  70 {
  71         struct fakelb_phy *current_phy = hw->priv, *phy;
  72
  73         read_lock_bh(&fakelb_ifup_phys_lock);
  74         WARN_ON(current_phy->suspended);
  75         list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) {
  76                 if (current_phy == phy)
  77                         continue;
  78
  79                 if (current_phy->page == phy->page &&
  80                     current_phy->channel == phy->channel) {
  81                         struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
  82
  83                         if (newskb)
  84                                 ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc);
  85                 }
  86         }
  87         read_unlock_bh(&fakelb_ifup_phys_lock);
  88
  89         ieee802154_xmit_complete(hw, skb, false);
  90         return 0;
  91 }
  92
  93 static int fakelb_hw_start(struct ieee802154_hw *hw)
  94 {
  95         struct fakelb_phy *phy = hw->priv;
  96
  97         write_lock_bh(&fakelb_ifup_phys_lock);
  98         phy->suspended = false;
  99         list_add(&phy->list_ifup, &fakelb_ifup_phys);
 100         write_unlock_bh(&fakelb_ifup_phys_lock);
 101
 102         return 0;
 103 }
 104
 105 static void fakelb_hw_stop(struct ieee802154_hw *hw)
 106 {
 107         struct fakelb_phy *phy = hw->priv;
 108
 109         write_lock_bh(&fakelb_ifup_phys_lock);
 110         phy->suspended = true;
 111         list_del(&phy->list_ifup);
 112         write_unlock_bh(&fakelb_ifup_phys_lock);
 113 }
 114
 115 static const struct ieee802154_ops fakelb_ops = {
 116         .owner = THIS_MODULE,
 117         .xmit_async = fakelb_hw_xmit,
 118         .ed = fakelb_hw_ed,
 119         .set_channel = fakelb_hw_channel,
 120         .start = fakelb_hw_start,
 121         .stop = fakelb_hw_stop,
 122 };
 123
 124 /* Number of dummy devices to be set up by this module. */
 125 module_param(numlbs, int, 0);
 126 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 127
 128 static int fakelb_add_one(struct device *dev)
 129 {
 130         struct ieee802154_hw *hw;
 131         struct fakelb_phy *phy;
 132         int err;
 133
 134         hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
 135         if (!hw)
 136                 return -ENOMEM;
 137
 138         phy = hw->priv;
 139         phy->hw = hw;
 140
 141         /* 868 MHz BPSK 802.15.4-2003 */
 142         hw->phy->supported.channels[0] |= 1;
 143         /* 915 MHz BPSK 802.15.4-2003 */
 144         hw->phy->supported.channels[0] |= 0x7fe;
 145         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 146         hw->phy->supported.channels[0] |= 0x7FFF800;
 147         /* 868 MHz ASK 802.15.4-2006 */
 148         hw->phy->supported.channels[1] |= 1;
 149         /* 915 MHz ASK 802.15.4-2006 */
 150         hw->phy->supported.channels[1] |= 0x7fe;
 151         /* 868 MHz O-QPSK 802.15.4-2006 */
 152         hw->phy->supported.channels[2] |= 1;
 153         /* 915 MHz O-QPSK 802.15.4-2006 */
 154         hw->phy->supported.channels[2] |= 0x7fe;
 155         /* 2.4 GHz CSS 802.15.4a-2007 */
 156         hw->phy->supported.channels[3] |= 0x3fff;
 157         /* UWB Sub-gigahertz 802.15.4a-2007 */
 158         hw->phy->supported.channels[4] |= 1;
 159         /* UWB Low band 802.15.4a-2007 */
 160         hw->phy->supported.channels[4] |= 0x1e;
 161         /* UWB High band 802.15.4a-2007 */
 162         hw->phy->supported.channels[4] |= 0xffe0;
 163         /* 750 MHz O-QPSK 802.15.4c-2009 */
 164         hw->phy->supported.channels[5] |= 0xf;
 165         /* 750 MHz MPSK 802.15.4c-2009 */
 166         hw->phy->supported.channels[5] |= 0xf0;
 167         /* 950 MHz BPSK 802.15.4d-2009 */
 168         hw->phy->supported.channels[6] |= 0x3ff;
 169         /* 950 MHz GFSK 802.15.4d-2009 */
 170         hw->phy->supported.channels[6] |= 0x3ffc00;
 171
 172         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
 173         /* fake phy channel 13 as default */
 174         hw->phy->current_channel = 13;
 175         phy->channel = hw->phy->current_channel;
 176
 177         hw->parent = dev;
 178
 179         err = ieee802154_register_hw(hw);
 180         if (err)
 181                 goto err_reg;
 182
 183         spin_lock(&fakelb_phys_lock);
 184         list_add_tail(&phy->list, &fakelb_phys);
 185         spin_unlock(&fakelb_phys_lock);
 186
 187         return 0;
 188
 189 err_reg:
 190         ieee802154_free_hw(phy->hw);
 191         return err;
 192 }
 193
 194 static void fakelb_del(struct fakelb_phy *phy)
 195 {
 196         list_del(&phy->list);
 197
 198         ieee802154_unregister_hw(phy->hw);
 199         ieee802154_free_hw(phy->hw);
 200 }
 201
 202 static int fakelb_probe(struct platform_device *pdev)
 203 {
 204         struct fakelb_phy *phy, *tmp;
 205         int err, i;
 206
 207         for (i = 0; i < numlbs; i++) {
 208                 err = fakelb_add_one(&pdev->dev);
 209                 if (err < 0)
 210                         goto err_slave;
 211         }
 212
 213         dev_info(&pdev->dev, "added ieee802154 hardware\n");
 214         return 0;
 215
 216 err_slave:
 217         spin_lock(&fakelb_phys_lock);
 218         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
 219                 fakelb_del(phy);
 220         spin_unlock(&fakelb_phys_lock);
 221         return err;
 222 }
 223
 224 static int fakelb_remove(struct platform_device *pdev)
 225 {
 226         struct fakelb_phy *phy, *tmp;
 227
 228         spin_lock(&fakelb_phys_lock);
 229         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
 230                 fakelb_del(phy);
 231         spin_unlock(&fakelb_phys_lock);
 232         return 0;
 233 }
 234
 235 static struct platform_device *ieee802154fake_dev;
 236
 237 static struct platform_driver ieee802154fake_driver = {
 238         .probe = fakelb_probe,
 239         .remove = fakelb_remove,
 240         .driver = {
 241                         .name = "ieee802154fakelb",
 242         },
 243 };
 244
 245 static __init int fakelb_init_module(void)
 246 {
 247         ieee802154fake_dev = platform_device_register_simple(
 248                              "ieee802154fakelb", -1, NULL, 0);
 249         return platform_driver_register(&ieee802154fake_driver);
 250 }
 251
 252 static __exit void fake_remove_module(void)
 253 {
 254         platform_driver_unregister(&ieee802154fake_driver);
 255         platform_device_unregister(ieee802154fake_dev);
 256 }
 257
 258 module_init(fakelb_init_module);
 259 module_exit(fake_remove_module);
 260 MODULE_LICENSE("GPL");