linux/drivers/ieee802154/fakelb.c
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   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
  33static int numlbs = 1;
  34
  35struct 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
  45struct fakelb_priv {
  46        struct list_head list;
  47        rwlock_t lock;
  48};
  49
  50static int
  51fakelb_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
  60static int
  61fakelb_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
  72static void
  73fakelb_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
  85static int
  86fakelb_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
 111static int
 112fakelb_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
 126static void
 127fakelb_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
 135static 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. */
 145module_param(numlbs, int, 0);
 146MODULE_PARM_DESC(numlbs, " number of pseudo devices");
 147
 148static 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
 209err_reg:
 210        ieee802154_free_device(priv->dev);
 211        return err;
 212}
 213
 214static 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
 224static int __devinit fakelb_probe(struct platform_device *pdev)
 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
 248err_slave:
 249        list_for_each_entry(dp, &priv->list, list)
 250                fakelb_del(dp);
 251        kfree(priv);
 252err_alloc:
 253        return err;
 254}
 255
 256static int __devexit fakelb_remove(struct platform_device *pdev)
 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
 268static struct platform_device *ieee802154fake_dev;
 269
 270static struct platform_driver ieee802154fake_driver = {
 271        .probe = fakelb_probe,
 272        .remove = __devexit_p(fakelb_remove),
 273        .driver = {
 274                        .name = "ieee802154fakelb",
 275                        .owner = THIS_MODULE,
 276        },
 277};
 278
 279static __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
 286static __exit void fake_remove_module(void)
 287{
 288        platform_driver_unregister(&ieee802154fake_driver);
 289        platform_device_unregister(ieee802154fake_dev);
 290}
 291
 292module_init(fakelb_init_module);
 293module_exit(fake_remove_module);
 294MODULE_LICENSE("GPL");
 295
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