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, 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 (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
62		    !ops->start || !ops->stop || !ops->set_channel))
63		return NULL;
64
65	/* Ensure 32-byte alignment of our private data and hw private data.
66	 * We use the wpan_phy priv data for both our ieee802154_local and for
67	 * the driver's private data
68	 *
69	 * in memory it'll be like this:
70	 *
71	 * +-------------------------+
72	 * | struct wpan_phy         |
73	 * +-------------------------+
74	 * | struct ieee802154_local |
75	 * +-------------------------+
76	 * | driver's private data   |
77	 * +-------------------------+
78	 *
79	 * Due to ieee802154 layer isn't aware of driver and MAC structures,
80	 * so lets align them here.
81	 */
82
83	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
84
85	phy = wpan_phy_new(&mac802154_config_ops, priv_size);
86	if (!phy) {
87		pr_err("failure to allocate master IEEE802.15.4 device\n");
88		return NULL;
89	}
90
91	phy->privid = mac802154_wpan_phy_privid;
92
93	local = wpan_phy_priv(phy);
94	local->phy = phy;
95	local->hw.phy = local->phy;
96	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
97	local->ops = ops;
98
99	INIT_LIST_HEAD(&local->interfaces);
100	mutex_init(&local->iflist_mtx);
101
102	tasklet_init(&local->tasklet,
103		     ieee802154_tasklet_handler,
104		     (unsigned long)local);
105
106	skb_queue_head_init(&local->skb_queue);
107
108	INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
109
110	/* init supported flags with 802.15.4 default ranges */
111	phy->supported.max_minbe = 8;
112	phy->supported.min_maxbe = 3;
113	phy->supported.max_maxbe = 8;
114	phy->supported.min_frame_retries = 0;
115	phy->supported.max_frame_retries = 7;
116	phy->supported.max_csma_backoffs = 5;
117	phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
118
119	/* always supported */
120	phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
121
122	return &local->hw;
123}
124EXPORT_SYMBOL(ieee802154_alloc_hw);
125
126void ieee802154_free_hw(struct ieee802154_hw *hw)
127{
128	struct ieee802154_local *local = hw_to_local(hw);
129
130	BUG_ON(!list_empty(&local->interfaces));
131
132	mutex_destroy(&local->iflist_mtx);
133
134	wpan_phy_free(local->phy);
135}
136EXPORT_SYMBOL(ieee802154_free_hw);
137
138static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
139{
140	/* TODO warn on empty symbol_duration
141	 * Should be done when all drivers sets this value.
142	 */
143
144	wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
145				wpan_phy->symbol_duration;
146	wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
147				wpan_phy->symbol_duration;
148}
149
150int ieee802154_register_hw(struct ieee802154_hw *hw)
151{
152	struct ieee802154_local *local = hw_to_local(hw);
153	struct net_device *dev;
154	int rc = -ENOSYS;
155
156	local->workqueue =
157		create_singlethread_workqueue(wpan_phy_name(local->phy));
158	if (!local->workqueue) {
159		rc = -ENOMEM;
160		goto out;
161	}
162
163	hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
164	local->ifs_timer.function = ieee802154_xmit_ifs_timer;
165
166	wpan_phy_set_dev(local->phy, local->hw.parent);
167
168	ieee802154_setup_wpan_phy_pib(local->phy);
169
170	if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
171		local->phy->supported.min_csma_backoffs = 4;
172		local->phy->supported.max_csma_backoffs = 4;
173		local->phy->supported.min_maxbe = 5;
174		local->phy->supported.max_maxbe = 5;
175		local->phy->supported.min_minbe = 3;
176		local->phy->supported.max_minbe = 3;
177	}
178
179	if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
180		local->phy->supported.min_frame_retries = 3;
181		local->phy->supported.max_frame_retries = 3;
182	}
183
184	if (hw->flags & IEEE802154_HW_PROMISCUOUS)
185		local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
186
187	rc = wpan_phy_register(local->phy);
188	if (rc < 0)
189		goto out_wq;
190
191	rtnl_lock();
192
193	dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
194				NL802154_IFTYPE_NODE,
195				cpu_to_le64(0x0000000000000000ULL));
196	if (IS_ERR(dev)) {
197		rtnl_unlock();
198		rc = PTR_ERR(dev);
199		goto out_phy;
200	}
201
202	rtnl_unlock();
203
204	return 0;
205
206out_phy:
207	wpan_phy_unregister(local->phy);
208out_wq:
209	destroy_workqueue(local->workqueue);
210out:
211	return rc;
212}
213EXPORT_SYMBOL(ieee802154_register_hw);
214
215void ieee802154_unregister_hw(struct ieee802154_hw *hw)
216{
217	struct ieee802154_local *local = hw_to_local(hw);
218
219	tasklet_kill(&local->tasklet);
220	flush_workqueue(local->workqueue);
221	destroy_workqueue(local->workqueue);
222
223	rtnl_lock();
224
225	ieee802154_remove_interfaces(local);
226
227	rtnl_unlock();
228
229	wpan_phy_unregister(local->phy);
230}
231EXPORT_SYMBOL(ieee802154_unregister_hw);
232
233static int __init ieee802154_init(void)
234{
235	return ieee802154_iface_init();
236}
237
238static void __exit ieee802154_exit(void)
239{
240	ieee802154_iface_exit();
241
242	rcu_barrier();
243}
244
245subsys_initcall(ieee802154_init);
246module_exit(ieee802154_exit);
247
248MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
249MODULE_LICENSE("GPL v2");
250