alex.bluesman.smirnov@gmail.com | e1e49b6 | 2012-05-15 20:50:30 +0000 | [diff] [blame] | 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/spinlock.h> |
| 30 | #include <net/mac802154.h> |
| 31 | #include <net/wpan-phy.h> |
| 32 | |
| 33 | static int numlbs = 1; |
| 34 | |
| 35 | struct fakelb_dev_priv { |
| 36 | struct ieee802154_dev *dev; |
| 37 | |
| 38 | struct list_head list; |
| 39 | struct fakelb_priv *fake; |
| 40 | |
| 41 | spinlock_t lock; |
| 42 | bool working; |
| 43 | }; |
| 44 | |
| 45 | struct fakelb_priv { |
| 46 | struct list_head list; |
| 47 | rwlock_t lock; |
| 48 | }; |
| 49 | |
| 50 | static int |
| 51 | fakelb_hw_ed(struct ieee802154_dev *dev, u8 *level) |
| 52 | { |
| 53 | might_sleep(); |
| 54 | BUG_ON(!level); |
| 55 | *level = 0xbe; |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static int |
| 61 | fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel) |
| 62 | { |
| 63 | pr_debug("set channel to %d\n", channel); |
| 64 | |
| 65 | might_sleep(); |
| 66 | dev->phy->current_page = page; |
| 67 | dev->phy->current_channel = channel; |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static void |
| 73 | fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb) |
| 74 | { |
| 75 | struct sk_buff *newskb; |
| 76 | |
| 77 | spin_lock(&priv->lock); |
| 78 | if (priv->working) { |
| 79 | newskb = pskb_copy(skb, GFP_ATOMIC); |
| 80 | ieee802154_rx_irqsafe(priv->dev, newskb, 0xcc); |
| 81 | } |
| 82 | spin_unlock(&priv->lock); |
| 83 | } |
| 84 | |
| 85 | static int |
| 86 | fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb) |
| 87 | { |
| 88 | struct fakelb_dev_priv *priv = dev->priv; |
| 89 | struct fakelb_priv *fake = priv->fake; |
| 90 | |
| 91 | might_sleep(); |
| 92 | |
| 93 | read_lock_bh(&fake->lock); |
| 94 | if (priv->list.next == priv->list.prev) { |
| 95 | /* we are the only one device */ |
| 96 | fakelb_hw_deliver(priv, skb); |
| 97 | } else { |
| 98 | struct fakelb_dev_priv *dp; |
| 99 | list_for_each_entry(dp, &priv->fake->list, list) { |
| 100 | if (dp != priv && |
| 101 | (dp->dev->phy->current_channel == |
| 102 | priv->dev->phy->current_channel)) |
| 103 | fakelb_hw_deliver(dp, skb); |
| 104 | } |
| 105 | } |
| 106 | read_unlock_bh(&fake->lock); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int |
| 112 | fakelb_hw_start(struct ieee802154_dev *dev) { |
| 113 | struct fakelb_dev_priv *priv = dev->priv; |
| 114 | int ret = 0; |
| 115 | |
| 116 | spin_lock(&priv->lock); |
| 117 | if (priv->working) |
| 118 | ret = -EBUSY; |
| 119 | else |
| 120 | priv->working = 1; |
| 121 | spin_unlock(&priv->lock); |
| 122 | |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | static void |
| 127 | fakelb_hw_stop(struct ieee802154_dev *dev) { |
| 128 | struct fakelb_dev_priv *priv = dev->priv; |
| 129 | |
| 130 | spin_lock(&priv->lock); |
| 131 | priv->working = 0; |
| 132 | spin_unlock(&priv->lock); |
| 133 | } |
| 134 | |
| 135 | static struct ieee802154_ops fakelb_ops = { |
| 136 | .owner = THIS_MODULE, |
| 137 | .xmit = fakelb_hw_xmit, |
| 138 | .ed = fakelb_hw_ed, |
| 139 | .set_channel = fakelb_hw_channel, |
| 140 | .start = fakelb_hw_start, |
| 141 | .stop = fakelb_hw_stop, |
| 142 | }; |
| 143 | |
| 144 | /* Number of dummy devices to be set up by this module. */ |
| 145 | module_param(numlbs, int, 0); |
| 146 | MODULE_PARM_DESC(numlbs, " number of pseudo devices"); |
| 147 | |
| 148 | static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake) |
| 149 | { |
| 150 | struct fakelb_dev_priv *priv; |
| 151 | int err; |
| 152 | struct ieee802154_dev *ieee; |
| 153 | |
| 154 | ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops); |
| 155 | if (!ieee) |
| 156 | return -ENOMEM; |
| 157 | |
| 158 | priv = ieee->priv; |
| 159 | priv->dev = ieee; |
| 160 | |
| 161 | /* 868 MHz BPSK 802.15.4-2003 */ |
| 162 | ieee->phy->channels_supported[0] |= 1; |
| 163 | /* 915 MHz BPSK 802.15.4-2003 */ |
| 164 | ieee->phy->channels_supported[0] |= 0x7fe; |
| 165 | /* 2.4 GHz O-QPSK 802.15.4-2003 */ |
| 166 | ieee->phy->channels_supported[0] |= 0x7FFF800; |
| 167 | /* 868 MHz ASK 802.15.4-2006 */ |
| 168 | ieee->phy->channels_supported[1] |= 1; |
| 169 | /* 915 MHz ASK 802.15.4-2006 */ |
| 170 | ieee->phy->channels_supported[1] |= 0x7fe; |
| 171 | /* 868 MHz O-QPSK 802.15.4-2006 */ |
| 172 | ieee->phy->channels_supported[2] |= 1; |
| 173 | /* 915 MHz O-QPSK 802.15.4-2006 */ |
| 174 | ieee->phy->channels_supported[2] |= 0x7fe; |
| 175 | /* 2.4 GHz CSS 802.15.4a-2007 */ |
| 176 | ieee->phy->channels_supported[3] |= 0x3fff; |
| 177 | /* UWB Sub-gigahertz 802.15.4a-2007 */ |
| 178 | ieee->phy->channels_supported[4] |= 1; |
| 179 | /* UWB Low band 802.15.4a-2007 */ |
| 180 | ieee->phy->channels_supported[4] |= 0x1e; |
| 181 | /* UWB High band 802.15.4a-2007 */ |
| 182 | ieee->phy->channels_supported[4] |= 0xffe0; |
| 183 | /* 750 MHz O-QPSK 802.15.4c-2009 */ |
| 184 | ieee->phy->channels_supported[5] |= 0xf; |
| 185 | /* 750 MHz MPSK 802.15.4c-2009 */ |
| 186 | ieee->phy->channels_supported[5] |= 0xf0; |
| 187 | /* 950 MHz BPSK 802.15.4d-2009 */ |
| 188 | ieee->phy->channels_supported[6] |= 0x3ff; |
| 189 | /* 950 MHz GFSK 802.15.4d-2009 */ |
| 190 | ieee->phy->channels_supported[6] |= 0x3ffc00; |
| 191 | |
| 192 | INIT_LIST_HEAD(&priv->list); |
| 193 | priv->fake = fake; |
| 194 | |
| 195 | spin_lock_init(&priv->lock); |
| 196 | |
| 197 | ieee->parent = dev; |
| 198 | |
| 199 | err = ieee802154_register_device(ieee); |
| 200 | if (err) |
| 201 | goto err_reg; |
| 202 | |
| 203 | write_lock_bh(&fake->lock); |
| 204 | list_add_tail(&priv->list, &fake->list); |
| 205 | write_unlock_bh(&fake->lock); |
| 206 | |
| 207 | return 0; |
| 208 | |
| 209 | err_reg: |
| 210 | ieee802154_free_device(priv->dev); |
| 211 | return err; |
| 212 | } |
| 213 | |
| 214 | static void fakelb_del(struct fakelb_dev_priv *priv) |
| 215 | { |
| 216 | write_lock_bh(&priv->fake->lock); |
| 217 | list_del(&priv->list); |
| 218 | write_unlock_bh(&priv->fake->lock); |
| 219 | |
| 220 | ieee802154_unregister_device(priv->dev); |
| 221 | ieee802154_free_device(priv->dev); |
| 222 | } |
| 223 | |
Bill Pemberton | bb1f460 | 2012-12-03 09:24:12 -0500 | [diff] [blame] | 224 | static int fakelb_probe(struct platform_device *pdev) |
alex.bluesman.smirnov@gmail.com | e1e49b6 | 2012-05-15 20:50:30 +0000 | [diff] [blame] | 225 | { |
| 226 | struct fakelb_priv *priv; |
| 227 | struct fakelb_dev_priv *dp; |
| 228 | int err = -ENOMEM; |
| 229 | int i; |
| 230 | |
| 231 | priv = kzalloc(sizeof(struct fakelb_priv), GFP_KERNEL); |
| 232 | if (!priv) |
| 233 | goto err_alloc; |
| 234 | |
| 235 | INIT_LIST_HEAD(&priv->list); |
| 236 | rwlock_init(&priv->lock); |
| 237 | |
| 238 | for (i = 0; i < numlbs; i++) { |
| 239 | err = fakelb_add_one(&pdev->dev, priv); |
| 240 | if (err < 0) |
| 241 | goto err_slave; |
| 242 | } |
| 243 | |
| 244 | platform_set_drvdata(pdev, priv); |
| 245 | dev_info(&pdev->dev, "added ieee802154 hardware\n"); |
| 246 | return 0; |
| 247 | |
| 248 | err_slave: |
| 249 | list_for_each_entry(dp, &priv->list, list) |
| 250 | fakelb_del(dp); |
| 251 | kfree(priv); |
| 252 | err_alloc: |
| 253 | return err; |
| 254 | } |
| 255 | |
Bill Pemberton | bb1f460 | 2012-12-03 09:24:12 -0500 | [diff] [blame] | 256 | static int fakelb_remove(struct platform_device *pdev) |
alex.bluesman.smirnov@gmail.com | e1e49b6 | 2012-05-15 20:50:30 +0000 | [diff] [blame] | 257 | { |
| 258 | struct fakelb_priv *priv = platform_get_drvdata(pdev); |
| 259 | struct fakelb_dev_priv *dp, *temp; |
| 260 | |
| 261 | list_for_each_entry_safe(dp, temp, &priv->list, list) |
| 262 | fakelb_del(dp); |
| 263 | kfree(priv); |
| 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, |
Bill Pemberton | bb1f460 | 2012-12-03 09:24:12 -0500 | [diff] [blame] | 272 | .remove = fakelb_remove, |
alex.bluesman.smirnov@gmail.com | e1e49b6 | 2012-05-15 20:50:30 +0000 | [diff] [blame] | 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"); |