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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 int
116 fakelb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
117 {
118         return 0;
119 }
120 
121 static const struct ieee802154_ops fakelb_ops = {
122         .owner = THIS_MODULE,
123         .xmit_async = fakelb_hw_xmit,
124         .ed = fakelb_hw_ed,
125         .set_channel = fakelb_hw_channel,
126         .start = fakelb_hw_start,
127         .stop = fakelb_hw_stop,
128         .set_promiscuous_mode = fakelb_set_promiscuous_mode,
129 };
130 
131 /* Number of dummy devices to be set up by this module. */
132 module_param(numlbs, int, 0);
133 MODULE_PARM_DESC(numlbs, " number of pseudo devices");
134 
135 static int fakelb_add_one(struct device *dev)
136 {
137         struct ieee802154_hw *hw;
138         struct fakelb_phy *phy;
139         int err;
140 
141         hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
142         if (!hw)
143                 return -ENOMEM;
144 
145         phy = hw->priv;
146         phy->hw = hw;
147 
148         /* 868 MHz BPSK 802.15.4-2003 */
149         hw->phy->supported.channels[0] |= 1;
150         /* 915 MHz BPSK 802.15.4-2003 */
151         hw->phy->supported.channels[0] |= 0x7fe;
152         /* 2.4 GHz O-QPSK 802.15.4-2003 */
153         hw->phy->supported.channels[0] |= 0x7FFF800;
154         /* 868 MHz ASK 802.15.4-2006 */
155         hw->phy->supported.channels[1] |= 1;
156         /* 915 MHz ASK 802.15.4-2006 */
157         hw->phy->supported.channels[1] |= 0x7fe;
158         /* 868 MHz O-QPSK 802.15.4-2006 */
159         hw->phy->supported.channels[2] |= 1;
160         /* 915 MHz O-QPSK 802.15.4-2006 */
161         hw->phy->supported.channels[2] |= 0x7fe;
162         /* 2.4 GHz CSS 802.15.4a-2007 */
163         hw->phy->supported.channels[3] |= 0x3fff;
164         /* UWB Sub-gigahertz 802.15.4a-2007 */
165         hw->phy->supported.channels[4] |= 1;
166         /* UWB Low band 802.15.4a-2007 */
167         hw->phy->supported.channels[4] |= 0x1e;
168         /* UWB High band 802.15.4a-2007 */
169         hw->phy->supported.channels[4] |= 0xffe0;
170         /* 750 MHz O-QPSK 802.15.4c-2009 */
171         hw->phy->supported.channels[5] |= 0xf;
172         /* 750 MHz MPSK 802.15.4c-2009 */
173         hw->phy->supported.channels[5] |= 0xf0;
174         /* 950 MHz BPSK 802.15.4d-2009 */
175         hw->phy->supported.channels[6] |= 0x3ff;
176         /* 950 MHz GFSK 802.15.4d-2009 */
177         hw->phy->supported.channels[6] |= 0x3ffc00;
178 
179         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
180         /* fake phy channel 13 as default */
181         hw->phy->current_channel = 13;
182         phy->channel = hw->phy->current_channel;
183 
184         hw->flags = IEEE802154_HW_PROMISCUOUS;
185         hw->parent = dev;
186 
187         err = ieee802154_register_hw(hw);
188         if (err)
189                 goto err_reg;
190 
191         spin_lock(&fakelb_phys_lock);
192         list_add_tail(&phy->list, &fakelb_phys);
193         spin_unlock(&fakelb_phys_lock);
194 
195         return 0;
196 
197 err_reg:
198         ieee802154_free_hw(phy->hw);
199         return err;
200 }
201 
202 static void fakelb_del(struct fakelb_phy *phy)
203 {
204         list_del(&phy->list);
205 
206         ieee802154_unregister_hw(phy->hw);
207         ieee802154_free_hw(phy->hw);
208 }
209 
210 static int fakelb_probe(struct platform_device *pdev)
211 {
212         struct fakelb_phy *phy, *tmp;
213         int err, i;
214 
215         for (i = 0; i < numlbs; i++) {
216                 err = fakelb_add_one(&pdev->dev);
217                 if (err < 0)
218                         goto err_slave;
219         }
220 
221         dev_info(&pdev->dev, "added ieee802154 hardware\n");
222         return 0;
223 
224 err_slave:
225         spin_lock(&fakelb_phys_lock);
226         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
227                 fakelb_del(phy);
228         spin_unlock(&fakelb_phys_lock);
229         return err;
230 }
231 
232 static int fakelb_remove(struct platform_device *pdev)
233 {
234         struct fakelb_phy *phy, *tmp;
235 
236         spin_lock(&fakelb_phys_lock);
237         list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
238                 fakelb_del(phy);
239         spin_unlock(&fakelb_phys_lock);
240         return 0;
241 }
242 
243 static struct platform_device *ieee802154fake_dev;
244 
245 static struct platform_driver ieee802154fake_driver = {
246         .probe = fakelb_probe,
247         .remove = fakelb_remove,
248         .driver = {
249                         .name = "ieee802154fakelb",
250         },
251 };
252 
253 static __init int fakelb_init_module(void)
254 {
255         ieee802154fake_dev = platform_device_register_simple(
256                              "ieee802154fakelb", -1, NULL, 0);
257         return platform_driver_register(&ieee802154fake_driver);
258 }
259 
260 static __exit void fake_remove_module(void)
261 {
262         platform_driver_unregister(&ieee802154fake_driver);
263         platform_device_unregister(ieee802154fake_dev);
264 }
265 
266 module_init(fakelb_init_module);
267 module_exit(fake_remove_module);
268 MODULE_LICENSE("GPL");
269 

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