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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 = 2;
 31 
 32 static LIST_HEAD(fakelb_phys);
 33 static DEFINE_SPINLOCK(fakelb_phys_lock);
 34 
 35 static LIST_HEAD(fakelb_ifup_phys);
 36 static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
 37 
 38 struct fakelb_phy {
 39         struct ieee802154_hw *hw;
 40 
 41         u8 page;
 42         u8 channel;
 43 
 44         bool suspended;
 45 
 46         struct list_head list;
 47         struct list_head list_ifup;
 48 };
 49 
 50 static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
 51 {
 52         BUG_ON(!level);
 53         *level = 0xbe;
 54 
 55         return 0;
 56 }
 57 
 58 static int fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 59 {
 60         struct fakelb_phy *phy = hw->priv;
 61 
 62         write_lock_bh(&fakelb_ifup_phys_lock);
 63         phy->page = page;
 64         phy->channel = channel;
 65         write_unlock_bh(&fakelb_ifup_phys_lock);
 66         return 0;
 67 }
 68 
 69 static int fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 70 {
 71         struct fakelb_phy *current_phy = hw->priv, *phy;
 72 
 73         read_lock_bh(&fakelb_ifup_phys_lock);
 74         WARN_ON(current_phy->suspended);
 75         list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) {
 76                 if (current_phy == phy)
 77                         continue;
 78 
 79                 if (current_phy->page == phy->page &&
 80                     current_phy->channel == phy->channel) {
 81                         struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
 82 
 83                         if (newskb)
 84                                 ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc);
 85                 }
 86         }
 87         read_unlock_bh(&fakelb_ifup_phys_lock);
 88 
 89         ieee802154_xmit_complete(hw, skb, false);
 90         return 0;
 91 }
 92 
 93 static int fakelb_hw_start(struct ieee802154_hw *hw)
 94 {
 95         struct fakelb_phy *phy = hw->priv;
 96 
 97         write_lock_bh(&fakelb_ifup_phys_lock);
 98         phy->suspended = false;
 99         list_add(&phy->list_ifup, &fakelb_ifup_phys);
100         write_unlock_bh(&fakelb_ifup_phys_lock);
101 
102         return 0;
103 }
104 
105 static void fakelb_hw_stop(struct ieee802154_hw *hw)
106 {
107         struct fakelb_phy *phy = hw->priv;
108 
109         write_lock_bh(&fakelb_ifup_phys_lock);
110         phy->suspended = true;
111         list_del(&phy->list_ifup);
112         write_unlock_bh(&fakelb_ifup_phys_lock);
113 }
114 
115 static const struct ieee802154_ops fakelb_ops = {
116         .owner = THIS_MODULE,
117         .xmit_async = fakelb_hw_xmit,
118         .ed = fakelb_hw_ed,
119         .set_channel = fakelb_hw_channel,
120         .start = fakelb_hw_start,
121         .stop = fakelb_hw_stop,
122 };
123 
124 /* Number of dummy devices to be set up by this module. */
125 module_param(numlbs, int, 0);
126 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
127 
128 static int fakelb_add_one(struct device *dev)
129 {
130         struct ieee802154_hw *hw;
131         struct fakelb_phy *phy;
132         int err;
133 
134         hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
135         if (!hw)
136                 return -ENOMEM;
137 
138         phy = hw->priv;
139         phy->hw = hw;
140 
141         /* 868 MHz BPSK 802.15.4-2003 */
142         hw->phy->supported.channels[0] |= 1;
143         /* 915 MHz BPSK 802.15.4-2003 */
144         hw->phy->supported.channels[0] |= 0x7fe;
145         /* 2.4 GHz O-QPSK 802.15.4-2003 */
146         hw->phy->supported.channels[0] |= 0x7FFF800;
147         /* 868 MHz ASK 802.15.4-2006 */
148         hw->phy->supported.channels[1] |= 1;
149         /* 915 MHz ASK 802.15.4-2006 */
150         hw->phy->supported.channels[1] |= 0x7fe;
151         /* 868 MHz O-QPSK 802.15.4-2006 */
152         hw->phy->supported.channels[2] |= 1;
153         /* 915 MHz O-QPSK 802.15.4-2006 */
154         hw->phy->supported.channels[2] |= 0x7fe;
155         /* 2.4 GHz CSS 802.15.4a-2007 */
156         hw->phy->supported.channels[3] |= 0x3fff;
157         /* UWB Sub-gigahertz 802.15.4a-2007 */
158         hw->phy->supported.channels[4] |= 1;
159         /* UWB Low band 802.15.4a-2007 */
160         hw->phy->supported.channels[4] |= 0x1e;
161         /* UWB High band 802.15.4a-2007 */
162         hw->phy->supported.channels[4] |= 0xffe0;
163         /* 750 MHz O-QPSK 802.15.4c-2009 */
164         hw->phy->supported.channels[5] |= 0xf;
165         /* 750 MHz MPSK 802.15.4c-2009 */
166         hw->phy->supported.channels[5] |= 0xf0;
167         /* 950 MHz BPSK 802.15.4d-2009 */
168         hw->phy->supported.channels[6] |= 0x3ff;
169         /* 950 MHz GFSK 802.15.4d-2009 */
170         hw->phy->supported.channels[6] |= 0x3ffc00;
171 
172         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
173         /* fake phy channel 13 as default */
174         hw->phy->current_channel = 13;
175         phy->channel = hw->phy->current_channel;
176 
177         hw->parent = dev;
178 
179         err = ieee802154_register_hw(hw);
180         if (err)
181                 goto err_reg;
182 
183         spin_lock(&fakelb_phys_lock);
184         list_add_tail(&phy->list, &fakelb_phys);
185         spin_unlock(&fakelb_phys_lock);
186 
187         return 0;
188 
189 err_reg:
190         ieee802154_free_hw(phy->hw);
191         return err;
192 }
193 
194 static void fakelb_del(struct fakelb_phy *phy)
195 {
196         list_del(&phy->list);
197 
198         ieee802154_unregister_hw(phy->hw);
199         ieee802154_free_hw(phy->hw);
200 }
201 
202 static int fakelb_probe(struct platform_device *pdev)
203 {
204         struct fakelb_phy *phy, *tmp;
205         int err, i;
206 
207         for (i = 0; i < numlbs; i++) {
208                 err = fakelb_add_one(&pdev->dev);
209                 if (err < 0)
210                         goto err_slave;
211         }
212 
213         dev_info(&pdev->dev, "added ieee802154 hardware\n");
214         return 0;
215 
216 err_slave:
217         spin_lock(&fakelb_phys_lock);
218         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
219                 fakelb_del(phy);
220         spin_unlock(&fakelb_phys_lock);
221         return err;
222 }
223 
224 static int fakelb_remove(struct platform_device *pdev)
225 {
226         struct fakelb_phy *phy, *tmp;
227 
228         spin_lock(&fakelb_phys_lock);
229         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
230                 fakelb_del(phy);
231         spin_unlock(&fakelb_phys_lock);
232         return 0;
233 }
234 
235 static struct platform_device *ieee802154fake_dev;
236 
237 static struct platform_driver ieee802154fake_driver = {
238         .probe = fakelb_probe,
239         .remove = fakelb_remove,
240         .driver = {
241                         .name = "ieee802154fakelb",
242         },
243 };
244 
245 static __init int fakelb_init_module(void)
246 {
247         ieee802154fake_dev = platform_device_register_simple(
248                              "ieee802154fakelb", -1, NULL, 0);
249         return platform_driver_register(&ieee802154fake_driver);
250 }
251 
252 static __exit void fake_remove_module(void)
253 {
254         platform_driver_unregister(&ieee802154fake_driver);
255         platform_device_unregister(ieee802154fake_dev);
256 }
257 
258 module_init(fakelb_init_module);
259 module_exit(fake_remove_module);
260 MODULE_LICENSE("GPL");
261 

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