xref: /openbmc/linux/drivers/net/ieee802154/fakelb.c (revision 62e7ca52) 
1 /*
2  * Loopback IEEE 802.15.4 interface
3  *
4  * Copyright 2007-2012 Siemens AG
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Written by:
20  * Sergey Lapin <slapin@ossfans.org>
21  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
22  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
23  */
24 
25 #include <linux/module.h>
26 #include <linux/timer.h>
27 #include <linux/platform_device.h>
28 #include <linux/netdevice.h>
29 #include <linux/device.h>
30 #include <linux/spinlock.h>
31 #include <net/mac802154.h>
32 #include <net/wpan-phy.h>
33 
34 static int numlbs = 1;
35 
36 struct fakelb_dev_priv {
37 	struct ieee802154_dev *dev;
38 
39 	struct list_head list;
40 	struct fakelb_priv *fake;
41 
42 	spinlock_t lock;
43 	bool working;
44 };
45 
46 struct fakelb_priv {
47 	struct list_head list;
48 	rwlock_t lock;
49 };
50 
51 static int
52 fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level)
53 {
54 	might_sleep();
55 	BUG_ON(!level);
56 	*level = 0xbe;
57 
58 	return 0;
59 }
60 
61 static int
62 fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
63 {
64 	pr_debug("set channel to %d\n", channel);
65 
66 	might_sleep();
67 	dev->phy->current_page = page;
68 	dev->phy->current_channel = channel;
69 
70 	return 0;
71 }
72 
73 static void
74 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
75 {
76 	struct sk_buff *newskb;
77 
78 	spin_lock(&priv->lock);
79 	if (priv->working) {
80 		newskb = pskb_copy(skb, GFP_ATOMIC);
81 		ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc);
82 	}
83 	spin_unlock(&priv->lock);
84 }
85 
86 static int
87 fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
88 {
89 	struct fakelb_dev_priv *priv = dev->priv;
90 	struct fakelb_priv *fake = priv->fake;
91 
92 	might_sleep();
93 
94 	read_lock_bh(&fake->lock);
95 	if (priv->list.next == priv->list.prev) {
96 		/* we are the only one device */
97 		fakelb_hw_deliver(priv, skb);
98 	} else {
99 		struct fakelb_dev_priv *dp;
100 		list_for_each_entry(dp, &priv->fake->list, list) {
101 			if (dp != priv &&
102 			    (dp->dev->phy->current_channel ==
103 			     priv->dev->phy->current_channel))
104 				fakelb_hw_deliver(dp, skb);
105 		}
106 	}
107 	read_unlock_bh(&fake->lock);
108 
109 	return 0;
110 }
111 
112 static int
113 fakelb_hw_start(struct ieee802154_dev *dev) {
114 	struct fakelb_dev_priv *priv = dev->priv;
115 	int ret = 0;
116 
117 	spin_lock(&priv->lock);
118 	if (priv->working)
119 		ret = -EBUSY;
120 	else
121 		priv->working = 1;
122 	spin_unlock(&priv->lock);
123 
124 	return ret;
125 }
126 
127 static void
128 fakelb_hw_stop(struct ieee802154_dev *dev) {
129 	struct fakelb_dev_priv *priv = dev->priv;
130 
131 	spin_lock(&priv->lock);
132 	priv->working = 0;
133 	spin_unlock(&priv->lock);
134 }
135 
136 static struct ieee802154_ops fakelb_ops = {
137 	.owner = THIS_MODULE,
138 	.xmit = fakelb_hw_xmit,
139 	.ed = fakelb_hw_ed,
140 	.set_channel = fakelb_hw_channel,
141 	.start = fakelb_hw_start,
142 	.stop = fakelb_hw_stop,
143 };
144 
145 /* Number of dummy devices to be set up by this module. */
146 module_param(numlbs, int, 0);
147 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
148 
149 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
150 {
151 	struct fakelb_dev_priv *priv;
152 	int err;
153 	struct ieee802154_dev *ieee;
154 
155 	ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
156 	if (!ieee)
157 		return -ENOMEM;
158 
159 	priv = ieee->priv;
160 	priv->dev = ieee;
161 
162 	/* 868 MHz BPSK	802.15.4-2003 */
163 	ieee->phy->channels_supported[0] |= 1;
164 	/* 915 MHz BPSK	802.15.4-2003 */
165 	ieee->phy->channels_supported[0] |= 0x7fe;
166 	/* 2.4 GHz O-QPSK 802.15.4-2003 */
167 	ieee->phy->channels_supported[0] |= 0x7FFF800;
168 	/* 868 MHz ASK 802.15.4-2006 */
169 	ieee->phy->channels_supported[1] |= 1;
170 	/* 915 MHz ASK 802.15.4-2006 */
171 	ieee->phy->channels_supported[1] |= 0x7fe;
172 	/* 868 MHz O-QPSK 802.15.4-2006 */
173 	ieee->phy->channels_supported[2] |= 1;
174 	/* 915 MHz O-QPSK 802.15.4-2006 */
175 	ieee->phy->channels_supported[2] |= 0x7fe;
176 	/* 2.4 GHz CSS 802.15.4a-2007 */
177 	ieee->phy->channels_supported[3] |= 0x3fff;
178 	/* UWB Sub-gigahertz 802.15.4a-2007 */
179 	ieee->phy->channels_supported[4] |= 1;
180 	/* UWB Low band 802.15.4a-2007 */
181 	ieee->phy->channels_supported[4] |= 0x1e;
182 	/* UWB High band 802.15.4a-2007 */
183 	ieee->phy->channels_supported[4] |= 0xffe0;
184 	/* 750 MHz O-QPSK 802.15.4c-2009 */
185 	ieee->phy->channels_supported[5] |= 0xf;
186 	/* 750 MHz MPSK 802.15.4c-2009 */
187 	ieee->phy->channels_supported[5] |= 0xf0;
188 	/* 950 MHz BPSK 802.15.4d-2009 */
189 	ieee->phy->channels_supported[6] |= 0x3ff;
190 	/* 950 MHz GFSK 802.15.4d-2009 */
191 	ieee->phy->channels_supported[6] |= 0x3ffc00;
192 
193 	INIT_LIST_HEAD(&priv->list);
194 	priv->fake = fake;
195 
196 	spin_lock_init(&priv->lock);
197 
198 	ieee->parent = dev;
199 
200 	err = ieee802154_register_device(ieee);
201 	if (err)
202 		goto err_reg;
203 
204 	write_lock_bh(&fake->lock);
205 	list_add_tail(&priv->list, &fake->list);
206 	write_unlock_bh(&fake->lock);
207 
208 	return 0;
209 
210 err_reg:
211 	ieee802154_free_device(priv->dev);
212 	return err;
213 }
214 
215 static void fakelb_del(struct fakelb_dev_priv *priv)
216 {
217 	write_lock_bh(&priv->fake->lock);
218 	list_del(&priv->list);
219 	write_unlock_bh(&priv->fake->lock);
220 
221 	ieee802154_unregister_device(priv->dev);
222 	ieee802154_free_device(priv->dev);
223 }
224 
225 static int fakelb_probe(struct platform_device *pdev)
226 {
227 	struct fakelb_priv *priv;
228 	struct fakelb_dev_priv *dp;
229 	int err = -ENOMEM;
230 	int i;
231 
232 	priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
233 			    GFP_KERNEL);
234 	if (!priv)
235 		goto err_alloc;
236 
237 	INIT_LIST_HEAD(&priv->list);
238 	rwlock_init(&priv->lock);
239 
240 	for (i = 0; i < numlbs; i++) {
241 		err = fakelb_add_one(&pdev->dev, priv);
242 		if (err < 0)
243 			goto err_slave;
244 	}
245 
246 	platform_set_drvdata(pdev, priv);
247 	dev_info(&pdev->dev, "added ieee802154 hardware\n");
248 	return 0;
249 
250 err_slave:
251 	list_for_each_entry(dp, &priv->list, list)
252 		fakelb_del(dp);
253 err_alloc:
254 	return err;
255 }
256 
257 static int fakelb_remove(struct platform_device *pdev)
258 {
259 	struct fakelb_priv *priv = platform_get_drvdata(pdev);
260 	struct fakelb_dev_priv *dp, *temp;
261 
262 	list_for_each_entry_safe(dp, temp, &priv->list, list)
263 		fakelb_del(dp);
264 
265 	return 0;
266 }
267 
268 static struct platform_device *ieee802154fake_dev;
269 
270 static struct platform_driver ieee802154fake_driver = {
271 	.probe = fakelb_probe,
272 	.remove = fakelb_remove,
273 	.driver = {
274 			.name = "ieee802154fakelb",
275 			.owner = THIS_MODULE,
276 	},
277 };
278 
279 static __init int fakelb_init_module(void)
280 {
281 	ieee802154fake_dev = platform_device_register_simple(
282 			     "ieee802154fakelb", -1, NULL, 0);
283 	return platform_driver_register(&ieee802154fake_driver);
284 }
285 
286 static __exit void fake_remove_module(void)
287 {
288 	platform_driver_unregister(&ieee802154fake_driver);
289 	platform_device_unregister(ieee802154fake_dev);
290 }
291 
292 module_init(fakelb_init_module);
293 module_exit(fake_remove_module);
294 MODULE_LICENSE("GPL");
295