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e1e49b64 | 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 | * | |
e1e49b64 | 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> | |
12b5c38f | 25 | #include <linux/device.h> |
e1e49b64 | 26 | #include <linux/spinlock.h> |
27 | #include <net/mac802154.h> | |
5ad60d36 | 28 | #include <net/cfg802154.h> |
e1e49b64 | 29 | |
30 | static int numlbs = 1; | |
31 | ||
32 | struct fakelb_dev_priv { | |
5a504397 | 33 | struct ieee802154_hw *hw; |
e1e49b64 | 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 | |
5a504397 | 48 | fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level) |
e1e49b64 | 49 | { |
e1e49b64 | 50 | BUG_ON(!level); |
51 | *level = 0xbe; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int | |
e37d2ec8 | 57 | fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel) |
e1e49b64 | 58 | { |
59 | pr_debug("set channel to %d\n", channel); | |
60 | ||
e1e49b64 | 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); | |
5a504397 | 72 | ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc); |
e1e49b64 | 73 | } |
74 | spin_unlock(&priv->lock); | |
75 | } | |
76 | ||
77 | static int | |
5a504397 | 78 | fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) |
e1e49b64 | 79 | { |
5a504397 | 80 | struct fakelb_dev_priv *priv = hw->priv; |
e1e49b64 | 81 | struct fakelb_priv *fake = priv->fake; |
82 | ||
e1e49b64 | 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 && | |
5a504397 AA |
91 | (dp->hw->phy->current_channel == |
92 | priv->hw->phy->current_channel)) | |
e1e49b64 | 93 | fakelb_hw_deliver(dp, skb); |
94 | } | |
95 | } | |
96 | read_unlock_bh(&fake->lock); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int | |
5a504397 AA |
102 | fakelb_hw_start(struct ieee802154_hw *hw) { |
103 | struct fakelb_dev_priv *priv = hw->priv; | |
e1e49b64 | 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 | |
5a504397 AA |
117 | fakelb_hw_stop(struct ieee802154_hw *hw) { |
118 | struct fakelb_dev_priv *priv = hw->priv; | |
e1e49b64 | 119 | |
120 | spin_lock(&priv->lock); | |
121 | priv->working = 0; | |
122 | spin_unlock(&priv->lock); | |
123 | } | |
124 | ||
16301861 | 125 | static const struct ieee802154_ops fakelb_ops = { |
e1e49b64 | 126 | .owner = THIS_MODULE, |
ed0a5dce | 127 | .xmit_sync = fakelb_hw_xmit, |
e1e49b64 | 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; | |
5a504397 | 142 | struct ieee802154_hw *hw; |
e1e49b64 | 143 | |
5a504397 AA |
144 | hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops); |
145 | if (!hw) | |
e1e49b64 | 146 | return -ENOMEM; |
147 | ||
5a504397 AA |
148 | priv = hw->priv; |
149 | priv->hw = hw; | |
e1e49b64 | 150 | |
151 | /* 868 MHz BPSK 802.15.4-2003 */ | |
5a504397 | 152 | hw->phy->channels_supported[0] |= 1; |
e1e49b64 | 153 | /* 915 MHz BPSK 802.15.4-2003 */ |
5a504397 | 154 | hw->phy->channels_supported[0] |= 0x7fe; |
e1e49b64 | 155 | /* 2.4 GHz O-QPSK 802.15.4-2003 */ |
5a504397 | 156 | hw->phy->channels_supported[0] |= 0x7FFF800; |
e1e49b64 | 157 | /* 868 MHz ASK 802.15.4-2006 */ |
5a504397 | 158 | hw->phy->channels_supported[1] |= 1; |
e1e49b64 | 159 | /* 915 MHz ASK 802.15.4-2006 */ |
5a504397 | 160 | hw->phy->channels_supported[1] |= 0x7fe; |
e1e49b64 | 161 | /* 868 MHz O-QPSK 802.15.4-2006 */ |
5a504397 | 162 | hw->phy->channels_supported[2] |= 1; |
e1e49b64 | 163 | /* 915 MHz O-QPSK 802.15.4-2006 */ |
5a504397 | 164 | hw->phy->channels_supported[2] |= 0x7fe; |
e1e49b64 | 165 | /* 2.4 GHz CSS 802.15.4a-2007 */ |
5a504397 | 166 | hw->phy->channels_supported[3] |= 0x3fff; |
e1e49b64 | 167 | /* UWB Sub-gigahertz 802.15.4a-2007 */ |
5a504397 | 168 | hw->phy->channels_supported[4] |= 1; |
e1e49b64 | 169 | /* UWB Low band 802.15.4a-2007 */ |
5a504397 | 170 | hw->phy->channels_supported[4] |= 0x1e; |
e1e49b64 | 171 | /* UWB High band 802.15.4a-2007 */ |
5a504397 | 172 | hw->phy->channels_supported[4] |= 0xffe0; |
e1e49b64 | 173 | /* 750 MHz O-QPSK 802.15.4c-2009 */ |
5a504397 | 174 | hw->phy->channels_supported[5] |= 0xf; |
e1e49b64 | 175 | /* 750 MHz MPSK 802.15.4c-2009 */ |
5a504397 | 176 | hw->phy->channels_supported[5] |= 0xf0; |
e1e49b64 | 177 | /* 950 MHz BPSK 802.15.4d-2009 */ |
5a504397 | 178 | hw->phy->channels_supported[6] |= 0x3ff; |
e1e49b64 | 179 | /* 950 MHz GFSK 802.15.4d-2009 */ |
5a504397 | 180 | hw->phy->channels_supported[6] |= 0x3ffc00; |
e1e49b64 | 181 | |
182 | INIT_LIST_HEAD(&priv->list); | |
183 | priv->fake = fake; | |
184 | ||
185 | spin_lock_init(&priv->lock); | |
186 | ||
5a504397 | 187 | hw->parent = dev; |
e1e49b64 | 188 | |
5a504397 | 189 | err = ieee802154_register_hw(hw); |
e1e49b64 | 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: | |
5a504397 | 200 | ieee802154_free_hw(priv->hw); |
e1e49b64 | 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 | ||
5a504397 AA |
210 | ieee802154_unregister_hw(priv->hw); |
211 | ieee802154_free_hw(priv->hw); | |
e1e49b64 | 212 | } |
213 | ||
bb1f4606 | 214 | static int fakelb_probe(struct platform_device *pdev) |
e1e49b64 | 215 | { |
216 | struct fakelb_priv *priv; | |
217 | struct fakelb_dev_priv *dp; | |
218 | int err = -ENOMEM; | |
219 | int i; | |
220 | ||
12b5c38f HS |
221 | priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv), |
222 | GFP_KERNEL); | |
e1e49b64 | 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); | |
e1e49b64 | 242 | err_alloc: |
243 | return err; | |
244 | } | |
245 | ||
bb1f4606 | 246 | static int fakelb_remove(struct platform_device *pdev) |
e1e49b64 | 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); | |
e1e49b64 | 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, | |
bb1f4606 | 261 | .remove = fakelb_remove, |
e1e49b64 | 262 | .driver = { |
263 | .name = "ieee802154fakelb", | |
264 | .owner = THIS_MODULE, | |
265 | }, | |
266 | }; | |
267 | ||
268 | static __init int fakelb_init_module(void) | |
269 | { | |
270 | ieee802154fake_dev = platform_device_register_simple( | |
271 | "ieee802154fakelb", -1, NULL, 0); | |
272 | return platform_driver_register(&ieee802154fake_driver); | |
273 | } | |
274 | ||
275 | static __exit void fake_remove_module(void) | |
276 | { | |
277 | platform_driver_unregister(&ieee802154fake_driver); | |
278 | platform_device_unregister(ieee802154fake_dev); | |
279 | } | |
280 | ||
281 | module_init(fakelb_init_module); | |
282 | module_exit(fake_remove_module); | |
283 | MODULE_LICENSE("GPL"); |