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 return 0; 91 } 92 93 static int 94 fakelb_hw_start(struct ieee802154_hw *hw) { 95 struct fakelb_phy *phy = hw->priv; 96 97 write_lock_bh(&fakelb_ifup_phys_lock); 98 list_add(&phy->list_ifup, &fakelb_ifup_phys); 99 write_unlock_bh(&fakelb_ifup_phys_lock); 100 101 return 0; 102 } 103 104 static void 105 fakelb_hw_stop(struct ieee802154_hw *hw) { 106 struct fakelb_phy *phy = hw->priv; 107 108 write_lock_bh(&fakelb_ifup_phys_lock); 109 list_del(&phy->list_ifup); 110 write_unlock_bh(&fakelb_ifup_phys_lock); 111 } 112 113 static const struct ieee802154_ops fakelb_ops = { 114 .owner = THIS_MODULE, 115 .xmit_sync = fakelb_hw_xmit, 116 .ed = fakelb_hw_ed, 117 .set_channel = fakelb_hw_channel, 118 .start = fakelb_hw_start, 119 .stop = fakelb_hw_stop, 120 }; 121 122 /* Number of dummy devices to be set up by this module. */ 123 module_param(numlbs, int, 0); 124 MODULE_PARM_DESC(numlbs, " number of pseudo devices"); 125 126 static int fakelb_add_one(struct device *dev) 127 { 128 struct fakelb_phy *phy; 129 int err; 130 struct ieee802154_hw *hw; 131 132 hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops); 133 if (!hw) 134 return -ENOMEM; 135 136 phy = hw->priv; 137 phy->hw = hw; 138 139 /* 868 MHz BPSK 802.15.4-2003 */ 140 hw->phy->supported.channels[0] |= 1; 141 /* 915 MHz BPSK 802.15.4-2003 */ 142 hw->phy->supported.channels[0] |= 0x7fe; 143 /* 2.4 GHz O-QPSK 802.15.4-2003 */ 144 hw->phy->supported.channels[0] |= 0x7FFF800; 145 /* 868 MHz ASK 802.15.4-2006 */ 146 hw->phy->supported.channels[1] |= 1; 147 /* 915 MHz ASK 802.15.4-2006 */ 148 hw->phy->supported.channels[1] |= 0x7fe; 149 /* 868 MHz O-QPSK 802.15.4-2006 */ 150 hw->phy->supported.channels[2] |= 1; 151 /* 915 MHz O-QPSK 802.15.4-2006 */ 152 hw->phy->supported.channels[2] |= 0x7fe; 153 /* 2.4 GHz CSS 802.15.4a-2007 */ 154 hw->phy->supported.channels[3] |= 0x3fff; 155 /* UWB Sub-gigahertz 802.15.4a-2007 */ 156 hw->phy->supported.channels[4] |= 1; 157 /* UWB Low band 802.15.4a-2007 */ 158 hw->phy->supported.channels[4] |= 0x1e; 159 /* UWB High band 802.15.4a-2007 */ 160 hw->phy->supported.channels[4] |= 0xffe0; 161 /* 750 MHz O-QPSK 802.15.4c-2009 */ 162 hw->phy->supported.channels[5] |= 0xf; 163 /* 750 MHz MPSK 802.15.4c-2009 */ 164 hw->phy->supported.channels[5] |= 0xf0; 165 /* 950 MHz BPSK 802.15.4d-2009 */ 166 hw->phy->supported.channels[6] |= 0x3ff; 167 /* 950 MHz GFSK 802.15.4d-2009 */ 168 hw->phy->supported.channels[6] |= 0x3ffc00; 169 170 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); 171 /* fake phy channel 13 as default */ 172 hw->phy->current_channel = 13; 173 phy->channel = hw->phy->current_channel; 174 175 hw->parent = dev; 176 177 err = ieee802154_register_hw(hw); 178 if (err) 179 goto err_reg; 180 181 spin_lock(&fakelb_phys_lock); 182 list_add_tail(&phy->list, &fakelb_phys); 183 spin_unlock(&fakelb_phys_lock); 184 185 return 0; 186 187 err_reg: 188 ieee802154_free_hw(phy->hw); 189 return err; 190 } 191 192 static void fakelb_del(struct fakelb_phy *phy) 193 { 194 list_del(&phy->list); 195 196 ieee802154_unregister_hw(phy->hw); 197 ieee802154_free_hw(phy->hw); 198 } 199 200 static int fakelb_probe(struct platform_device *pdev) 201 { 202 struct fakelb_phy *phy, *tmp; 203 int err = -ENOMEM; 204 int i; 205 206 for (i = 0; i < numlbs; i++) { 207 err = fakelb_add_one(&pdev->dev); 208 if (err < 0) 209 goto err_slave; 210 } 211 212 dev_info(&pdev->dev, "added ieee802154 hardware\n"); 213 return 0; 214 215 err_slave: 216 spin_lock(&fakelb_phys_lock); 217 list_for_each_entry_safe(phy, tmp, &fakelb_phys, list) 218 fakelb_del(phy); 219 spin_unlock(&fakelb_phys_lock); 220 return err; 221 } 222 223 static int fakelb_remove(struct platform_device *pdev) 224 { 225 struct fakelb_phy *phy, *temp; 226 227 spin_lock(&fakelb_phys_lock); 228 list_for_each_entry_safe(phy, temp, &fakelb_phys, list) 229 fakelb_del(phy); 230 spin_unlock(&fakelb_phys_lock); 231 return 0; 232 } 233 234 static struct platform_device *ieee802154fake_dev; 235 236 static struct platform_driver ieee802154fake_driver = { 237 .probe = fakelb_probe, 238 .remove = fakelb_remove, 239 .driver = { 240 .name = "ieee802154fakelb", 241 }, 242 }; 243 244 static __init int fakelb_init_module(void) 245 { 246 ieee802154fake_dev = platform_device_register_simple( 247 "ieee802154fakelb", -1, NULL, 0); 248 return platform_driver_register(&ieee802154fake_driver); 249 } 250 251 static __exit void fake_remove_module(void) 252 { 253 platform_driver_unregister(&ieee802154fake_driver); 254 platform_device_unregister(ieee802154fake_dev); 255 } 256 257 module_init(fakelb_init_module); 258 module_exit(fake_remove_module); 259 MODULE_LICENSE("GPL"); 260