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1 | /* | |
2 | * Copyright (C) 2007-2012 Siemens AG | |
3 | * | |
4 | * Written by: | |
5 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
6 | * | |
7 | * Based on the code from 'linux-zigbee.sourceforge.net' project. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/netdevice.h> | |
22 | ||
23 | #include <net/netlink.h> | |
24 | #include <linux/nl802154.h> | |
25 | #include <net/mac802154.h> | |
26 | #include <net/ieee802154_netdev.h> | |
27 | #include <net/route.h> | |
28 | #include <net/cfg802154.h> | |
29 | ||
30 | #include "ieee802154_i.h" | |
31 | #include "cfg.h" | |
32 | ||
33 | static void ieee802154_tasklet_handler(unsigned long data) | |
34 | { | |
35 | struct ieee802154_local *local = (struct ieee802154_local *)data; | |
36 | struct sk_buff *skb; | |
37 | ||
38 | while ((skb = skb_dequeue(&local->skb_queue))) { | |
39 | switch (skb->pkt_type) { | |
40 | case IEEE802154_RX_MSG: | |
41 | /* Clear skb->pkt_type in order to not confuse kernel | |
42 | * netstack. | |
43 | */ | |
44 | skb->pkt_type = 0; | |
45 | ieee802154_rx(&local->hw, skb); | |
46 | break; | |
47 | default: | |
48 | WARN(1, "mac802154: Packet is of unknown type %d\n", | |
49 | skb->pkt_type); | |
50 | kfree_skb(skb); | |
51 | break; | |
52 | } | |
53 | } | |
54 | } | |
55 | ||
56 | struct ieee802154_hw * | |
57 | ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) | |
58 | { | |
59 | struct wpan_phy *phy; | |
60 | struct ieee802154_local *local; | |
61 | size_t priv_size; | |
62 | ||
63 | if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed || | |
64 | !ops->start || !ops->stop || !ops->set_channel) { | |
65 | pr_err("undefined IEEE802.15.4 device operations\n"); | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | /* Ensure 32-byte alignment of our private data and hw private data. | |
70 | * We use the wpan_phy priv data for both our ieee802154_local and for | |
71 | * the driver's private data | |
72 | * | |
73 | * in memory it'll be like this: | |
74 | * | |
75 | * +-------------------------+ | |
76 | * | struct wpan_phy | | |
77 | * +-------------------------+ | |
78 | * | struct ieee802154_local | | |
79 | * +-------------------------+ | |
80 | * | driver's private data | | |
81 | * +-------------------------+ | |
82 | * | |
83 | * Due to ieee802154 layer isn't aware of driver and MAC structures, | |
84 | * so lets align them here. | |
85 | */ | |
86 | ||
87 | priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; | |
88 | ||
89 | phy = wpan_phy_alloc(&mac802154_config_ops, priv_size); | |
90 | if (!phy) { | |
91 | pr_err("failure to allocate master IEEE802.15.4 device\n"); | |
92 | return NULL; | |
93 | } | |
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 | int ieee802154_register_hw(struct ieee802154_hw *hw) | |
127 | { | |
128 | struct ieee802154_local *local = hw_to_local(hw); | |
129 | struct net_device *dev; | |
130 | int rc = -ENOSYS; | |
131 | ||
132 | local->workqueue = | |
133 | create_singlethread_workqueue(wpan_phy_name(local->phy)); | |
134 | if (!local->workqueue) { | |
135 | rc = -ENOMEM; | |
136 | goto out; | |
137 | } | |
138 | ||
139 | wpan_phy_set_dev(local->phy, local->hw.parent); | |
140 | ||
141 | rc = wpan_phy_register(local->phy); | |
142 | if (rc < 0) | |
143 | goto out_wq; | |
144 | ||
145 | rtnl_lock(); | |
146 | ||
147 | dev = ieee802154_if_add(local, "wpan%d", NULL, IEEE802154_DEV_WPAN); | |
148 | if (IS_ERR(dev)) { | |
149 | rtnl_unlock(); | |
150 | rc = PTR_ERR(dev); | |
151 | goto out_wq; | |
152 | } | |
153 | ||
154 | rtnl_unlock(); | |
155 | ||
156 | return 0; | |
157 | ||
158 | out_wq: | |
159 | destroy_workqueue(local->workqueue); | |
160 | out: | |
161 | return rc; | |
162 | } | |
163 | EXPORT_SYMBOL(ieee802154_register_hw); | |
164 | ||
165 | void ieee802154_unregister_hw(struct ieee802154_hw *hw) | |
166 | { | |
167 | struct ieee802154_local *local = hw_to_local(hw); | |
168 | struct ieee802154_sub_if_data *sdata, *next; | |
169 | ||
170 | tasklet_kill(&local->tasklet); | |
171 | flush_workqueue(local->workqueue); | |
172 | destroy_workqueue(local->workqueue); | |
173 | ||
174 | rtnl_lock(); | |
175 | ||
176 | list_for_each_entry_safe(sdata, next, &local->interfaces, list) { | |
177 | mutex_lock(&sdata->local->iflist_mtx); | |
178 | list_del(&sdata->list); | |
179 | mutex_unlock(&sdata->local->iflist_mtx); | |
180 | ||
181 | unregister_netdevice(sdata->dev); | |
182 | } | |
183 | ||
184 | rtnl_unlock(); | |
185 | ||
186 | wpan_phy_unregister(local->phy); | |
187 | } | |
188 | EXPORT_SYMBOL(ieee802154_unregister_hw); | |
189 | ||
190 | MODULE_DESCRIPTION("IEEE 802.15.4 implementation"); | |
191 | MODULE_LICENSE("GPL v2"); |