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"); 261