summaryrefslogtreecommitdiffstats
path: root/drivers/net/ieee802154/fakelb.c
blob: dc2bfb600b4bd491a8bc2a41e12e84a87e1bff77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * Loopback IEEE 802.15.4 interface
 *
 * Copyright 2007-2012 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

#include <linux/module.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>

static int numlbs = 1;

struct fakelb_dev_priv {
	struct ieee802154_hw *hw;

	struct list_head list;
	struct fakelb_priv *fake;

	spinlock_t lock;
	bool working;
};

struct fakelb_priv {
	struct list_head list;
	rwlock_t lock;
};

static int
fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
{
	BUG_ON(!level);
	*level = 0xbe;

	return 0;
}

static int
fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
	pr_debug("set channel to %d\n", channel);

	return 0;
}

static void
fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
{
	struct sk_buff *newskb;

	spin_lock(&priv->lock);
	if (priv->working) {
		newskb = pskb_copy(skb, GFP_ATOMIC);
		ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
	}
	spin_unlock(&priv->lock);
}

static int
fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
	struct fakelb_dev_priv *priv = hw->priv;
	struct fakelb_priv *fake = priv->fake;

	read_lock_bh(&fake->lock);
	if (priv->list.next == priv->list.prev) {
		/* we are the only one device */
		fakelb_hw_deliver(priv, skb);
	} else {
		struct fakelb_dev_priv *dp;
		list_for_each_entry(dp, &priv->fake->list, list) {
			if (dp != priv &&
			    (dp->hw->phy->current_channel ==
			     priv->hw->phy->current_channel))
				fakelb_hw_deliver(dp, skb);
		}
	}
	read_unlock_bh(&fake->lock);

	return 0;
}

static int
fakelb_hw_start(struct ieee802154_hw *hw) {
	struct fakelb_dev_priv *priv = hw->priv;
	int ret = 0;

	spin_lock(&priv->lock);
	if (priv->working)
		ret = -EBUSY;
	else
		priv->working = 1;
	spin_unlock(&priv->lock);

	return ret;
}

static void
fakelb_hw_stop(struct ieee802154_hw *hw) {
	struct fakelb_dev_priv *priv = hw->priv;

	spin_lock(&priv->lock);
	priv->working = 0;
	spin_unlock(&priv->lock);
}

static const struct ieee802154_ops fakelb_ops = {
	.owner = THIS_MODULE,
	.xmit_sync = fakelb_hw_xmit,
	.ed = fakelb_hw_ed,
	.set_channel = fakelb_hw_channel,
	.start = fakelb_hw_start,
	.stop = fakelb_hw_stop,
};

/* Number of dummy devices to be set up by this module. */
module_param(numlbs, int, 0);
MODULE_PARM_DESC(numlbs, " number of pseudo devices");

static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
{
	struct fakelb_dev_priv *priv;
	int err;
	struct ieee802154_hw *hw;

	hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
	if (!hw)
		return -ENOMEM;

	priv = hw->priv;
	priv->hw = hw;

	/* 868 MHz BPSK	802.15.4-2003 */
	hw->phy->channels_supported[0] |= 1;
	/* 915 MHz BPSK	802.15.4-2003 */
	hw->phy->channels_supported[0] |= 0x7fe;
	/* 2.4 GHz O-QPSK 802.15.4-2003 */
	hw->phy->channels_supported[0] |= 0x7FFF800;
	/* 868 MHz ASK 802.15.4-2006 */
	hw->phy->channels_supported[1] |= 1;
	/* 915 MHz ASK 802.15.4-2006 */
	hw->phy->channels_supported[1] |= 0x7fe;
	/* 868 MHz O-QPSK 802.15.4-2006 */
	hw->phy->channels_supported[2] |= 1;
	/* 915 MHz O-QPSK 802.15.4-2006 */
	hw->phy->channels_supported[2] |= 0x7fe;
	/* 2.4 GHz CSS 802.15.4a-2007 */
	hw->phy->channels_supported[3] |= 0x3fff;
	/* UWB Sub-gigahertz 802.15.4a-2007 */
	hw->phy->channels_supported[4] |= 1;
	/* UWB Low band 802.15.4a-2007 */
	hw->phy->channels_supported[4] |= 0x1e;
	/* UWB High band 802.15.4a-2007 */
	hw->phy->channels_supported[4] |= 0xffe0;
	/* 750 MHz O-QPSK 802.15.4c-2009 */
	hw->phy->channels_supported[5] |= 0xf;
	/* 750 MHz MPSK 802.15.4c-2009 */
	hw->phy->channels_supported[5] |= 0xf0;
	/* 950 MHz BPSK 802.15.4d-2009 */
	hw->phy->channels_supported[6] |= 0x3ff;
	/* 950 MHz GFSK 802.15.4d-2009 */
	hw->phy->channels_supported[6] |= 0x3ffc00;

	INIT_LIST_HEAD(&priv->list);
	priv->fake = fake;

	spin_lock_init(&priv->lock);

	hw->parent = dev;

	err = ieee802154_register_hw(hw);
	if (err)
		goto err_reg;

	write_lock_bh(&fake->lock);
	list_add_tail(&priv->list, &fake->list);
	write_unlock_bh(&fake->lock);

	return 0;

err_reg:
	ieee802154_free_hw(priv->hw);
	return err;
}

static void fakelb_del(struct fakelb_dev_priv *priv)
{
	write_lock_bh(&priv->fake->lock);
	list_del(&priv->list);
	write_unlock_bh(&priv->fake->lock);

	ieee802154_unregister_hw(priv->hw);
	ieee802154_free_hw(priv->hw);
}

static int fakelb_probe(struct platform_device *pdev)
{
	struct fakelb_priv *priv;
	struct fakelb_dev_priv *dp;
	int err = -ENOMEM;
	int i;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
			    GFP_KERNEL);
	if (!priv)
		goto err_alloc;

	INIT_LIST_HEAD(&priv->list);
	rwlock_init(&priv->lock);

	for (i = 0; i < numlbs; i++) {
		err = fakelb_add_one(&pdev->dev, priv);
		if (err < 0)
			goto err_slave;
	}

	platform_set_drvdata(pdev, priv);
	dev_info(&pdev->dev, "added ieee802154 hardware\n");
	return 0;

err_slave:
	list_for_each_entry(dp, &priv->list, list)
		fakelb_del(dp);
err_alloc:
	return err;
}

static int fakelb_remove(struct platform_device *pdev)
{
	struct fakelb_priv *priv = platform_get_drvdata(pdev);
	struct fakelb_dev_priv *dp, *temp;

	list_for_each_entry_safe(dp, temp, &priv->list, list)
		fakelb_del(dp);

	return 0;
}

static struct platform_device *ieee802154fake_dev;

static struct platform_driver ieee802154fake_driver = {
	.probe = fakelb_probe,
	.remove = fakelb_remove,
	.driver = {
			.name = "ieee802154fakelb",
	},
};

static __init int fakelb_init_module(void)
{
	ieee802154fake_dev = platform_device_register_simple(
			     "ieee802154fakelb", -1, NULL, 0);
	return platform_driver_register(&ieee802154fake_driver);
}

static __exit void fake_remove_module(void)
{
	platform_driver_unregister(&ieee802154fake_driver);
	platform_device_unregister(ieee802154fake_dev);
}

module_init(fakelb_init_module);
module_exit(fake_remove_module);
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud