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_MUTEX(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 int
 116 fakelb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
 117 {
 118         return 0;
 119 }
 120
 121 static const struct ieee802154_ops fakelb_ops = {
 122         .owner = THIS_MODULE,
 123         .xmit_async = fakelb_hw_xmit,
 124         .ed = fakelb_hw_ed,
 125         .set_channel = fakelb_hw_channel,
 126         .start = fakelb_hw_start,
 127         .stop = fakelb_hw_stop,
 128         .set_promiscuous_mode = fakelb_set_promiscuous_mode,
 129 };
 130
 131 /* Number of dummy devices to be set up by this module. */
 132 module_param(numlbs, int, 0);
 133 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 134
 135 static int fakelb_add_one(struct device *dev)
 136 {
 137         struct ieee802154_hw *hw;
 138         struct fakelb_phy *phy;
 139         int err;
 140
 141         hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
 142         if (!hw)
 143                 return -ENOMEM;
 144
 145         phy = hw->priv;
 146         phy->hw = hw;
 147
 148         /* 868 MHz BPSK 802.15.4-2003 */
 149         hw->phy->supported.channels[0] |= 1;
 150         /* 915 MHz BPSK 802.15.4-2003 */
 151         hw->phy->supported.channels[0] |= 0x7fe;
 152         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 153         hw->phy->supported.channels[0] |= 0x7FFF800;
 154         /* 868 MHz ASK 802.15.4-2006 */
 155         hw->phy->supported.channels[1] |= 1;
 156         /* 915 MHz ASK 802.15.4-2006 */
 157         hw->phy->supported.channels[1] |= 0x7fe;
 158         /* 868 MHz O-QPSK 802.15.4-2006 */
 159         hw->phy->supported.channels[2] |= 1;
 160         /* 915 MHz O-QPSK 802.15.4-2006 */
 161         hw->phy->supported.channels[2] |= 0x7fe;
 162         /* 2.4 GHz CSS 802.15.4a-2007 */
 163         hw->phy->supported.channels[3] |= 0x3fff;
 164         /* UWB Sub-gigahertz 802.15.4a-2007 */
 165         hw->phy->supported.channels[4] |= 1;
 166         /* UWB Low band 802.15.4a-2007 */
 167         hw->phy->supported.channels[4] |= 0x1e;
 168         /* UWB High band 802.15.4a-2007 */
 169         hw->phy->supported.channels[4] |= 0xffe0;
 170         /* 750 MHz O-QPSK 802.15.4c-2009 */
 171         hw->phy->supported.channels[5] |= 0xf;
 172         /* 750 MHz MPSK 802.15.4c-2009 */
 173         hw->phy->supported.channels[5] |= 0xf0;
 174         /* 950 MHz BPSK 802.15.4d-2009 */
 175         hw->phy->supported.channels[6] |= 0x3ff;
 176         /* 950 MHz GFSK 802.15.4d-2009 */
 177         hw->phy->supported.channels[6] |= 0x3ffc00;
 178
 179         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
 180         /* fake phy channel 13 as default */
 181         hw->phy->current_channel = 13;
 182         phy->channel = hw->phy->current_channel;
 183
 184         hw->flags = IEEE802154_HW_PROMISCUOUS;
 185         hw->parent = dev;
 186
 187         err = ieee802154_register_hw(hw);
 188         if (err)
 189                 goto err_reg;
 190
 191         mutex_lock(&fakelb_phys_lock);
 192         list_add_tail(&phy->list, &fakelb_phys);
 193         mutex_unlock(&fakelb_phys_lock);
 194
 195         return 0;
 196
 197 err_reg:
 198         ieee802154_free_hw(phy->hw);
 199         return err;
 200 }
 201
 202 static void fakelb_del(struct fakelb_phy *phy)
 203 {
 204         list_del(&phy->list);
 205
 206         ieee802154_unregister_hw(phy->hw);
 207         ieee802154_free_hw(phy->hw);
 208 }
 209
 210 static int fakelb_probe(struct platform_device *pdev)
 211 {
 212         struct fakelb_phy *phy, *tmp;
 213         int err, i;
 214
 215         for (i = 0; i < numlbs; i++) {
 216                 err = fakelb_add_one(&pdev->dev);
 217                 if (err < 0)
 218                         goto err_slave;
 219         }
 220
 221         dev_info(&pdev->dev, "added %i fake ieee802154 hardware devices\n", numlbs);
 222         return 0;
 223
 224 err_slave:
 225         mutex_lock(&fakelb_phys_lock);
 226         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
 227                 fakelb_del(phy);
 228         mutex_unlock(&fakelb_phys_lock);
 229         return err;
 230 }
 231
 232 static int fakelb_remove(struct platform_device *pdev)
 233 {
 234         struct fakelb_phy *phy, *tmp;
 235
 236         mutex_lock(&fakelb_phys_lock);
 237         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
 238                 fakelb_del(phy);
 239         mutex_unlock(&fakelb_phys_lock);
 240         return 0;
 241 }
 242
 243 static struct platform_device *ieee802154fake_dev;
 244
 245 static struct platform_driver ieee802154fake_driver = {
 246         .probe = fakelb_probe,
 247         .remove = fakelb_remove,
 248         .driver = {
 249                         .name = "ieee802154fakelb",
 250         },
 251 };
 252
 253 static __init int fakelb_init_module(void)
 254 {
 255         ieee802154fake_dev = platform_device_register_simple(
 256                              "ieee802154fakelb", -1, NULL, 0);
 257         return platform_driver_register(&ieee802154fake_driver);
 258 }
 259
 260 static __exit void fake_remove_module(void)
 261 {
 262         platform_driver_unregister(&ieee802154fake_driver);
 263         platform_device_unregister(ieee802154fake_dev);
 264 }
 265
 266 module_init(fakelb_init_module);
 267 module_exit(fake_remove_module);
 268 MODULE_LICENSE("GPL");