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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  * Written by:
 16  * Sergey Lapin <slapin@ossfans.org>
 17  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 18  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 19  */
 20 
 21 #include <linux/module.h>
 22 #include <linux/timer.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/netdevice.h>
 25 #include <linux/device.h>
 26 #include <linux/spinlock.h>
 27 #include <net/mac802154.h>
 28 #include <net/cfg802154.h>
 29 
 30 static int numlbs = 1;
 31 
 32 struct fakelb_dev_priv {
 33         struct ieee802154_hw *hw;
 34 
 35         struct list_head list;
 36         struct fakelb_priv *fake;
 37 
 38         spinlock_t lock;
 39         bool working;
 40 };
 41 
 42 struct fakelb_priv {
 43         struct list_head list;
 44         rwlock_t lock;
 45 };
 46 
 47 static int
 48 fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
 49 {
 50         BUG_ON(!level);
 51         *level = 0xbe;
 52 
 53         return 0;
 54 }
 55 
 56 static int
 57 fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 58 {
 59         pr_debug("set channel to %d\n", channel);
 60 
 61         return 0;
 62 }
 63 
 64 static void
 65 fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
 66 {
 67         struct sk_buff *newskb;
 68 
 69         spin_lock(&priv->lock);
 70         if (priv->working) {
 71                 newskb = pskb_copy(skb, GFP_ATOMIC);
 72                 ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
 73         }
 74         spin_unlock(&priv->lock);
 75 }
 76 
 77 static int
 78 fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 79 {
 80         struct fakelb_dev_priv *priv = hw->priv;
 81         struct fakelb_priv *fake = priv->fake;
 82 
 83         read_lock_bh(&fake->lock);
 84         if (priv->list.next == priv->list.prev) {
 85                 /* we are the only one device */
 86                 fakelb_hw_deliver(priv, skb);
 87         } else {
 88                 struct fakelb_dev_priv *dp;
 89                 list_for_each_entry(dp, &priv->fake->list, list) {
 90                         if (dp != priv &&
 91                             (dp->hw->phy->current_channel ==
 92                              priv->hw->phy->current_channel))
 93                                 fakelb_hw_deliver(dp, skb);
 94                 }
 95         }
 96         read_unlock_bh(&fake->lock);
 97 
 98         return 0;
 99 }
100 
101 static int
102 fakelb_hw_start(struct ieee802154_hw *hw) {
103         struct fakelb_dev_priv *priv = hw->priv;
104         int ret = 0;
105 
106         spin_lock(&priv->lock);
107         if (priv->working)
108                 ret = -EBUSY;
109         else
110                 priv->working = 1;
111         spin_unlock(&priv->lock);
112 
113         return ret;
114 }
115 
116 static void
117 fakelb_hw_stop(struct ieee802154_hw *hw) {
118         struct fakelb_dev_priv *priv = hw->priv;
119 
120         spin_lock(&priv->lock);
121         priv->working = 0;
122         spin_unlock(&priv->lock);
123 }
124 
125 static const struct ieee802154_ops fakelb_ops = {
126         .owner = THIS_MODULE,
127         .xmit_sync = fakelb_hw_xmit,
128         .ed = fakelb_hw_ed,
129         .set_channel = fakelb_hw_channel,
130         .start = fakelb_hw_start,
131         .stop = fakelb_hw_stop,
132 };
133 
134 /* Number of dummy devices to be set up by this module. */
135 module_param(numlbs, int, 0);
136 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
137 
138 static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
139 {
140         struct fakelb_dev_priv *priv;
141         int err;
142         struct ieee802154_hw *hw;
143 
144         hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
145         if (!hw)
146                 return -ENOMEM;
147 
148         priv = hw->priv;
149         priv->hw = hw;
150 
151         /* 868 MHz BPSK 802.15.4-2003 */
152         hw->phy->channels_supported[0] |= 1;
153         /* 915 MHz BPSK 802.15.4-2003 */
154         hw->phy->channels_supported[0] |= 0x7fe;
155         /* 2.4 GHz O-QPSK 802.15.4-2003 */
156         hw->phy->channels_supported[0] |= 0x7FFF800;
157         /* 868 MHz ASK 802.15.4-2006 */
158         hw->phy->channels_supported[1] |= 1;
159         /* 915 MHz ASK 802.15.4-2006 */
160         hw->phy->channels_supported[1] |= 0x7fe;
161         /* 868 MHz O-QPSK 802.15.4-2006 */
162         hw->phy->channels_supported[2] |= 1;
163         /* 915 MHz O-QPSK 802.15.4-2006 */
164         hw->phy->channels_supported[2] |= 0x7fe;
165         /* 2.4 GHz CSS 802.15.4a-2007 */
166         hw->phy->channels_supported[3] |= 0x3fff;
167         /* UWB Sub-gigahertz 802.15.4a-2007 */
168         hw->phy->channels_supported[4] |= 1;
169         /* UWB Low band 802.15.4a-2007 */
170         hw->phy->channels_supported[4] |= 0x1e;
171         /* UWB High band 802.15.4a-2007 */
172         hw->phy->channels_supported[4] |= 0xffe0;
173         /* 750 MHz O-QPSK 802.15.4c-2009 */
174         hw->phy->channels_supported[5] |= 0xf;
175         /* 750 MHz MPSK 802.15.4c-2009 */
176         hw->phy->channels_supported[5] |= 0xf0;
177         /* 950 MHz BPSK 802.15.4d-2009 */
178         hw->phy->channels_supported[6] |= 0x3ff;
179         /* 950 MHz GFSK 802.15.4d-2009 */
180         hw->phy->channels_supported[6] |= 0x3ffc00;
181 
182         INIT_LIST_HEAD(&priv->list);
183         priv->fake = fake;
184 
185         spin_lock_init(&priv->lock);
186 
187         hw->parent = dev;
188 
189         err = ieee802154_register_hw(hw);
190         if (err)
191                 goto err_reg;
192 
193         write_lock_bh(&fake->lock);
194         list_add_tail(&priv->list, &fake->list);
195         write_unlock_bh(&fake->lock);
196 
197         return 0;
198 
199 err_reg:
200         ieee802154_free_hw(priv->hw);
201         return err;
202 }
203 
204 static void fakelb_del(struct fakelb_dev_priv *priv)
205 {
206         write_lock_bh(&priv->fake->lock);
207         list_del(&priv->list);
208         write_unlock_bh(&priv->fake->lock);
209 
210         ieee802154_unregister_hw(priv->hw);
211         ieee802154_free_hw(priv->hw);
212 }
213 
214 static int fakelb_probe(struct platform_device *pdev)
215 {
216         struct fakelb_priv *priv;
217         struct fakelb_dev_priv *dp;
218         int err = -ENOMEM;
219         int i;
220 
221         priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
222                             GFP_KERNEL);
223         if (!priv)
224                 goto err_alloc;
225 
226         INIT_LIST_HEAD(&priv->list);
227         rwlock_init(&priv->lock);
228 
229         for (i = 0; i < numlbs; i++) {
230                 err = fakelb_add_one(&pdev->dev, priv);
231                 if (err < 0)
232                         goto err_slave;
233         }
234 
235         platform_set_drvdata(pdev, priv);
236         dev_info(&pdev->dev, "added ieee802154 hardware\n");
237         return 0;
238 
239 err_slave:
240         list_for_each_entry(dp, &priv->list, list)
241                 fakelb_del(dp);
242 err_alloc:
243         return err;
244 }
245 
246 static int fakelb_remove(struct platform_device *pdev)
247 {
248         struct fakelb_priv *priv = platform_get_drvdata(pdev);
249         struct fakelb_dev_priv *dp, *temp;
250 
251         list_for_each_entry_safe(dp, temp, &priv->list, list)
252                 fakelb_del(dp);
253 
254         return 0;
255 }
256 
257 static struct platform_device *ieee802154fake_dev;
258 
259 static struct platform_driver ieee802154fake_driver = {
260         .probe = fakelb_probe,
261         .remove = fakelb_remove,
262         .driver = {
263                         .name = "ieee802154fakelb",
264         },
265 };
266 
267 static __init int fakelb_init_module(void)
268 {
269         ieee802154fake_dev = platform_device_register_simple(
270                              "ieee802154fakelb", -1, NULL, 0);
271         return platform_driver_register(&ieee802154fake_driver);
272 }
273 
274 static __exit void fake_remove_module(void)
275 {
276         platform_driver_unregister(&ieee802154fake_driver);
277         platform_device_unregister(ieee802154fake_dev);
278 }
279 
280 module_init(fakelb_init_module);
281 module_exit(fake_remove_module);
282 MODULE_LICENSE("GPL");
283 

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