1 /* 2 * Copyright (C) 2007-2012 Siemens AG 3 * 4 * Written by: 5 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 9 * as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/netdevice.h> 20 21 #include <net/netlink.h> 22 #include <net/nl802154.h> 23 #include <net/mac802154.h> 24 #include <net/ieee802154_netdev.h> 25 #include <net/route.h> 26 #include <net/cfg802154.h> 27 28 #include "ieee802154_i.h" 29 #include "cfg.h" 30 31 static void ieee802154_tasklet_handler(unsigned long data) 32 { 33 struct ieee802154_local *local = (struct ieee802154_local *)data; 34 struct sk_buff *skb; 35 36 while ((skb = skb_dequeue(&local->skb_queue))) { 37 switch (skb->pkt_type) { 38 case IEEE802154_RX_MSG: 39 /* Clear skb->pkt_type in order to not confuse kernel 40 * netstack. 41 */ 42 skb->pkt_type = 0; 43 ieee802154_rx(&local->hw, skb); 44 break; 45 default: 46 WARN(1, "mac802154: Packet is of unknown type %d\n", 47 skb->pkt_type); 48 kfree_skb(skb); 49 break; 50 } 51 } 52 } 53 54 struct ieee802154_hw * 55 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) 56 { 57 struct wpan_phy *phy; 58 struct ieee802154_local *local; 59 size_t priv_size; 60 61 if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed || 62 !ops->start || !ops->stop || !ops->set_channel) { 63 pr_err("undefined IEEE802.15.4 device operations\n"); 64 return NULL; 65 } 66 67 /* Ensure 32-byte alignment of our private data and hw private data. 68 * We use the wpan_phy priv data for both our ieee802154_local and for 69 * the driver's private data 70 * 71 * in memory it'll be like this: 72 * 73 * +-------------------------+ 74 * | struct wpan_phy | 75 * +-------------------------+ 76 * | struct ieee802154_local | 77 * +-------------------------+ 78 * | driver's private data | 79 * +-------------------------+ 80 * 81 * Due to ieee802154 layer isn't aware of driver and MAC structures, 82 * so lets align them here. 83 */ 84 85 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 86 87 phy = wpan_phy_new(&mac802154_config_ops, priv_size); 88 if (!phy) { 89 pr_err("failure to allocate master IEEE802.15.4 device\n"); 90 return NULL; 91 } 92 93 phy->privid = mac802154_wpan_phy_privid; 94 95 local = wpan_phy_priv(phy); 96 local->phy = phy; 97 local->hw.phy = local->phy; 98 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 99 local->ops = ops; 100 101 INIT_LIST_HEAD(&local->interfaces); 102 mutex_init(&local->iflist_mtx); 103 104 tasklet_init(&local->tasklet, 105 ieee802154_tasklet_handler, 106 (unsigned long)local); 107 108 skb_queue_head_init(&local->skb_queue); 109 110 return &local->hw; 111 } 112 EXPORT_SYMBOL(ieee802154_alloc_hw); 113 114 void ieee802154_free_hw(struct ieee802154_hw *hw) 115 { 116 struct ieee802154_local *local = hw_to_local(hw); 117 118 BUG_ON(!list_empty(&local->interfaces)); 119 120 mutex_destroy(&local->iflist_mtx); 121 122 wpan_phy_free(local->phy); 123 } 124 EXPORT_SYMBOL(ieee802154_free_hw); 125 126 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) 127 { 128 /* TODO warn on empty symbol_duration 129 * Should be done when all drivers sets this value. 130 */ 131 132 wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD * 133 wpan_phy->symbol_duration; 134 wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD * 135 wpan_phy->symbol_duration; 136 } 137 138 int ieee802154_register_hw(struct ieee802154_hw *hw) 139 { 140 struct ieee802154_local *local = hw_to_local(hw); 141 struct net_device *dev; 142 int rc = -ENOSYS; 143 144 local->workqueue = 145 create_singlethread_workqueue(wpan_phy_name(local->phy)); 146 if (!local->workqueue) { 147 rc = -ENOMEM; 148 goto out; 149 } 150 151 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 152 local->ifs_timer.function = ieee802154_xmit_ifs_timer; 153 154 wpan_phy_set_dev(local->phy, local->hw.parent); 155 156 ieee802154_setup_wpan_phy_pib(local->phy); 157 158 rc = wpan_phy_register(local->phy); 159 if (rc < 0) 160 goto out_wq; 161 162 rtnl_lock(); 163 164 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, 165 NL802154_IFTYPE_NODE, 166 cpu_to_le64(0x0000000000000000ULL)); 167 if (IS_ERR(dev)) { 168 rtnl_unlock(); 169 rc = PTR_ERR(dev); 170 goto out_phy; 171 } 172 173 rtnl_unlock(); 174 175 return 0; 176 177 out_phy: 178 wpan_phy_unregister(local->phy); 179 out_wq: 180 destroy_workqueue(local->workqueue); 181 out: 182 return rc; 183 } 184 EXPORT_SYMBOL(ieee802154_register_hw); 185 186 void ieee802154_unregister_hw(struct ieee802154_hw *hw) 187 { 188 struct ieee802154_local *local = hw_to_local(hw); 189 190 tasklet_kill(&local->tasklet); 191 flush_workqueue(local->workqueue); 192 destroy_workqueue(local->workqueue); 193 194 rtnl_lock(); 195 196 ieee802154_remove_interfaces(local); 197 198 rtnl_unlock(); 199 200 wpan_phy_unregister(local->phy); 201 } 202 EXPORT_SYMBOL(ieee802154_unregister_hw); 203 204 static int __init ieee802154_init(void) 205 { 206 return ieee802154_iface_init(); 207 } 208 209 static void __exit ieee802154_exit(void) 210 { 211 ieee802154_iface_exit(); 212 213 rcu_barrier(); 214 } 215 216 subsys_initcall(ieee802154_init); 217 module_exit(ieee802154_exit); 218 219 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); 220 MODULE_LICENSE("GPL v2"); 221