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Linux/drivers/net/ieee802154/fakelb.c

  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/spinlock.h>
 30 #include <net/mac802154.h>
 31 #include <net/wpan-phy.h>
 32 
 33 static int numlbs = 1;
 34 
 35 struct fakelb_dev_priv {
 36         struct ieee802154_dev *dev;
 37 
 38         struct list_head list;
 39         struct fakelb_priv *fake;
 40 
 41         spinlock_t lock;
 42         bool working;
 43 };
 44 
 45 struct fakelb_priv {
 46         struct list_head list;
 47         rwlock_t lock;
 48 };
 49 
 50 static int
 51 fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level)
 52 {
 53         might_sleep();
 54         BUG_ON(!level);
 55         *level = 0xbe;
 56 
 57         return 0;
 58 }
 59 
 60 static int
 61 fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
 62 {
 63         pr_debug("set channel to %d\n", channel);
 64 
 65         might_sleep();
 66         dev->phy->current_page = page;
 67         dev->phy->current_channel = channel;
 68 
 69         return 0;
 70 }
 71 
 72 static void
 73 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
 74 {
 75         struct sk_buff *newskb;
 76 
 77         spin_lock(&priv->lock);
 78         if (priv->working) {
 79                 newskb = pskb_copy(skb, GFP_ATOMIC);
 80                 ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc);
 81         }
 82         spin_unlock(&priv->lock);
 83 }
 84 
 85 static int
 86 fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
 87 {
 88         struct fakelb_dev_priv *priv = dev->priv;
 89         struct fakelb_priv *fake = priv->fake;
 90 
 91         might_sleep();
 92 
 93         read_lock_bh(&fake->lock);
 94         if (priv->list.next == priv->list.prev) {
 95                 /* we are the only one device */
 96                 fakelb_hw_deliver(priv, skb);
 97         } else {
 98                 struct fakelb_dev_priv *dp;
 99                 list_for_each_entry(dp, &priv->fake->list, list) {
100                         if (dp != priv &&
101                             (dp->dev->phy->current_channel ==
102                              priv->dev->phy->current_channel))
103                                 fakelb_hw_deliver(dp, skb);
104                 }
105         }
106         read_unlock_bh(&fake->lock);
107 
108         return 0;
109 }
110 
111 static int
112 fakelb_hw_start(struct ieee802154_dev *dev) {
113         struct fakelb_dev_priv *priv = dev->priv;
114         int ret = 0;
115 
116         spin_lock(&priv->lock);
117         if (priv->working)
118                 ret = -EBUSY;
119         else
120                 priv->working = 1;
121         spin_unlock(&priv->lock);
122 
123         return ret;
124 }
125 
126 static void
127 fakelb_hw_stop(struct ieee802154_dev *dev) {
128         struct fakelb_dev_priv *priv = dev->priv;
129 
130         spin_lock(&priv->lock);
131         priv->working = 0;
132         spin_unlock(&priv->lock);
133 }
134 
135 static struct ieee802154_ops fakelb_ops = {
136         .owner = THIS_MODULE,
137         .xmit = fakelb_hw_xmit,
138         .ed = fakelb_hw_ed,
139         .set_channel = fakelb_hw_channel,
140         .start = fakelb_hw_start,
141         .stop = fakelb_hw_stop,
142 };
143 
144 /* Number of dummy devices to be set up by this module. */
145 module_param(numlbs, int, 0);
146 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
147 
148 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
149 {
150         struct fakelb_dev_priv *priv;
151         int err;
152         struct ieee802154_dev *ieee;
153 
154         ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
155         if (!ieee)
156                 return -ENOMEM;
157 
158         priv = ieee->priv;
159         priv->dev = ieee;
160 
161         /* 868 MHz BPSK 802.15.4-2003 */
162         ieee->phy->channels_supported[0] |= 1;
163         /* 915 MHz BPSK 802.15.4-2003 */
164         ieee->phy->channels_supported[0] |= 0x7fe;
165         /* 2.4 GHz O-QPSK 802.15.4-2003 */
166         ieee->phy->channels_supported[0] |= 0x7FFF800;
167         /* 868 MHz ASK 802.15.4-2006 */
168         ieee->phy->channels_supported[1] |= 1;
169         /* 915 MHz ASK 802.15.4-2006 */
170         ieee->phy->channels_supported[1] |= 0x7fe;
171         /* 868 MHz O-QPSK 802.15.4-2006 */
172         ieee->phy->channels_supported[2] |= 1;
173         /* 915 MHz O-QPSK 802.15.4-2006 */
174         ieee->phy->channels_supported[2] |= 0x7fe;
175         /* 2.4 GHz CSS 802.15.4a-2007 */
176         ieee->phy->channels_supported[3] |= 0x3fff;
177         /* UWB Sub-gigahertz 802.15.4a-2007 */
178         ieee->phy->channels_supported[4] |= 1;
179         /* UWB Low band 802.15.4a-2007 */
180         ieee->phy->channels_supported[4] |= 0x1e;
181         /* UWB High band 802.15.4a-2007 */
182         ieee->phy->channels_supported[4] |= 0xffe0;
183         /* 750 MHz O-QPSK 802.15.4c-2009 */
184         ieee->phy->channels_supported[5] |= 0xf;
185         /* 750 MHz MPSK 802.15.4c-2009 */
186         ieee->phy->channels_supported[5] |= 0xf0;
187         /* 950 MHz BPSK 802.15.4d-2009 */
188         ieee->phy->channels_supported[6] |= 0x3ff;
189         /* 950 MHz GFSK 802.15.4d-2009 */
190         ieee->phy->channels_supported[6] |= 0x3ffc00;
191 
192         INIT_LIST_HEAD(&priv->list);
193         priv->fake = fake;
194 
195         spin_lock_init(&priv->lock);
196 
197         ieee->parent = dev;
198 
199         err = ieee802154_register_device(ieee);
200         if (err)
201                 goto err_reg;
202 
203         write_lock_bh(&fake->lock);
204         list_add_tail(&priv->list, &fake->list);
205         write_unlock_bh(&fake->lock);
206 
207         return 0;
208 
209 err_reg:
210         ieee802154_free_device(priv->dev);
211         return err;
212 }
213 
214 static void fakelb_del(struct fakelb_dev_priv *priv)
215 {
216         write_lock_bh(&priv->fake->lock);
217         list_del(&priv->list);
218         write_unlock_bh(&priv->fake->lock);
219 
220         ieee802154_unregister_device(priv->dev);
221         ieee802154_free_device(priv->dev);
222 }
223 
224 static int fakelb_probe(struct platform_device *pdev)
225 {
226         struct fakelb_priv *priv;
227         struct fakelb_dev_priv *dp;
228         int err = -ENOMEM;
229         int i;
230 
231         priv = kzalloc(sizeof(struct fakelb_priv), GFP_KERNEL);
232         if (!priv)
233                 goto err_alloc;
234 
235         INIT_LIST_HEAD(&priv->list);
236         rwlock_init(&priv->lock);
237 
238         for (i = 0; i < numlbs; i++) {
239                 err = fakelb_add_one(&pdev->dev, priv);
240                 if (err < 0)
241                         goto err_slave;
242         }
243 
244         platform_set_drvdata(pdev, priv);
245         dev_info(&pdev->dev, "added ieee802154 hardware\n");
246         return 0;
247 
248 err_slave:
249         list_for_each_entry(dp, &priv->list, list)
250                 fakelb_del(dp);
251         kfree(priv);
252 err_alloc:
253         return err;
254 }
255 
256 static int fakelb_remove(struct platform_device *pdev)
257 {
258         struct fakelb_priv *priv = platform_get_drvdata(pdev);
259         struct fakelb_dev_priv *dp, *temp;
260 
261         list_for_each_entry_safe(dp, temp, &priv->list, list)
262                 fakelb_del(dp);
263         kfree(priv);
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 

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