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
31static 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
54struct ieee802154_hw *
55ieee802154_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}
112EXPORT_SYMBOL(ieee802154_alloc_hw);
113
114void 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}
124EXPORT_SYMBOL(ieee802154_free_hw);
125
126static 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
138int 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
177out_phy:
178	wpan_phy_unregister(local->phy);
179out_wq:
180	destroy_workqueue(local->workqueue);
181out:
182	return rc;
183}
184EXPORT_SYMBOL(ieee802154_register_hw);
185
186void 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}
202EXPORT_SYMBOL(ieee802154_unregister_hw);
203
204static int __init ieee802154_init(void)
205{
206	return ieee802154_iface_init();
207}
208
209static void __exit ieee802154_exit(void)
210{
211	ieee802154_iface_exit();
212
213	rcu_barrier();
214}
215
216subsys_initcall(ieee802154_init);
217module_exit(ieee802154_exit);
218
219MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
220MODULE_LICENSE("GPL v2");
221