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 struct list_head list; 45 struct list_head list_ifup; 46 }; 47 48 static int 49 fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level) 50 { 51 BUG_ON(!level); 52 *level = 0xbe; 53 54 return 0; 55 } 56 57 static int 58 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 70 fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) 71 { 72 struct fakelb_phy *current_phy = hw->priv; 73 struct fakelb_phy *phy; 74 75 read_lock_bh(&fakelb_ifup_phys_lock); 76 list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) { 77 if (current_phy == phy) 78 continue; 79 80 if (current_phy->page == phy->page && 81 current_phy->channel == phy->channel) { 82 struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC); 83 84 if (newskb) 85 ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc); 86 } 87 } 88 read_unlock_bh(&fakelb_ifup_phys_lock); 89 90 ieee802154_xmit_complete(hw, skb, false); 91 return 0; 92 } 93 94 static int 95 fakelb_hw_start(struct ieee802154_hw *hw) { 96 struct fakelb_phy *phy = hw->priv; 97 98 write_lock_bh(&fakelb_ifup_phys_lock); 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 106 fakelb_hw_stop(struct ieee802154_hw *hw) { 107 struct fakelb_phy *phy = hw->priv; 108 109 write_lock_bh(&fakelb_ifup_phys_lock); 110 list_del(&phy->list_ifup); 111 write_unlock_bh(&fakelb_ifup_phys_lock); 112 } 113 114 static const struct ieee802154_ops fakelb_ops = { 115 .owner = THIS_MODULE, 116 .xmit_async = fakelb_hw_xmit, 117 .ed = fakelb_hw_ed, 118 .set_channel = fakelb_hw_channel, 119 .start = fakelb_hw_start, 120 .stop = fakelb_hw_stop, 121 }; 122 123 /* Number of dummy devices to be set up by this module. */ 124 module_param(numlbs, int, 0); 125 MODULE_PARM_DESC(numlbs, " number of pseudo devices"); 126 127 static int fakelb_add_one(struct device *dev) 128 { 129 struct fakelb_phy *phy; 130 int err; 131 struct ieee802154_hw *hw; 132 133 hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops); 134 if (!hw) 135 return -ENOMEM; 136 137 phy = hw->priv; 138 phy->hw = hw; 139 140 /* 868 MHz BPSK 802.15.4-2003 */ 141 hw->phy->supported.channels[0] |= 1; 142 /* 915 MHz BPSK 802.15.4-2003 */ 143 hw->phy->supported.channels[0] |= 0x7fe; 144 /* 2.4 GHz O-QPSK 802.15.4-2003 */ 145 hw->phy->supported.channels[0] |= 0x7FFF800; 146 /* 868 MHz ASK 802.15.4-2006 */ 147 hw->phy->supported.channels[1] |= 1; 148 /* 915 MHz ASK 802.15.4-2006 */ 149 hw->phy->supported.channels[1] |= 0x7fe; 150 /* 868 MHz O-QPSK 802.15.4-2006 */ 151 hw->phy->supported.channels[2] |= 1; 152 /* 915 MHz O-QPSK 802.15.4-2006 */ 153 hw->phy->supported.channels[2] |= 0x7fe; 154 /* 2.4 GHz CSS 802.15.4a-2007 */ 155 hw->phy->supported.channels[3] |= 0x3fff; 156 /* UWB Sub-gigahertz 802.15.4a-2007 */ 157 hw->phy->supported.channels[4] |= 1; 158 /* UWB Low band 802.15.4a-2007 */ 159 hw->phy->supported.channels[4] |= 0x1e; 160 /* UWB High band 802.15.4a-2007 */ 161 hw->phy->supported.channels[4] |= 0xffe0; 162 /* 750 MHz O-QPSK 802.15.4c-2009 */ 163 hw->phy->supported.channels[5] |= 0xf; 164 /* 750 MHz MPSK 802.15.4c-2009 */ 165 hw->phy->supported.channels[5] |= 0xf0; 166 /* 950 MHz BPSK 802.15.4d-2009 */ 167 hw->phy->supported.channels[6] |= 0x3ff; 168 /* 950 MHz GFSK 802.15.4d-2009 */ 169 hw->phy->supported.channels[6] |= 0x3ffc00; 170 171 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); 172 /* fake phy channel 13 as default */ 173 hw->phy->current_channel = 13; 174 phy->channel = hw->phy->current_channel; 175 176 hw->parent = dev; 177 178 err = ieee802154_register_hw(hw); 179 if (err) 180 goto err_reg; 181 182 spin_lock(&fakelb_phys_lock); 183 list_add_tail(&phy->list, &fakelb_phys); 184 spin_unlock(&fakelb_phys_lock); 185 186 return 0; 187 188 err_reg: 189 ieee802154_free_hw(phy->hw); 190 return err; 191 } 192 193 static void fakelb_del(struct fakelb_phy *phy) 194 { 195 list_del(&phy->list); 196 197 ieee802154_unregister_hw(phy->hw); 198 ieee802154_free_hw(phy->hw); 199 } 200 201 static int fakelb_probe(struct platform_device *pdev) 202 { 203 struct fakelb_phy *phy, *tmp; 204 int err = -ENOMEM; 205 int 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, *temp; 227 228 spin_lock(&fakelb_phys_lock); 229 list_for_each_entry_safe(phy, temp, &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"); 261