Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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/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 

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