drivers/net/ieee802154/fakehard.c

   1 /*
   2  * Sample driver for HardMAC IEEE 802.15.4 devices
   3  *
   4  * Copyright (C) 2009 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  * Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/if_arp.h>
  28
  29 #include <net/af_ieee802154.h>
  30 #include <net/ieee802154_netdev.h>
  31 #include <net/ieee802154.h>
  32 #include <net/nl802154.h>
  33 #include <net/wpan-phy.h>
  34
  35 struct fakehard_priv {
  36         struct wpan_phy *phy;
  37 };
  38
  39 static struct wpan_phy *fake_to_phy(const struct net_device *dev)
  40 {
  41         struct fakehard_priv *priv = netdev_priv(dev);
  42         return priv->phy;
  43 }
  44
  45 /**
  46  * fake_get_phy - Return a phy corresponding to this device.
  47  * @dev: The network device for which to return the wan-phy object
  48  *
  49  * This function returns a wpan-phy object corresponding to the passed
  50  * network device. Reference counter for wpan-phy object is incremented,
  51  * so when the wpan-phy isn't necessary, you should drop the reference
  52  * via @wpan_phy_put() call.
  53  */
  54 static struct wpan_phy *fake_get_phy(const struct net_device *dev)
  55 {
  56         struct wpan_phy *phy = fake_to_phy(dev);
  57         return to_phy(get_device(&phy->dev));
  58 }
  59
  60 /**
  61  * fake_get_pan_id - Retrieve the PAN ID of the device.
  62  * @dev: The network device to retrieve the PAN of.
  63  *
  64  * Return the ID of the PAN from the PIB.
  65  */
  66 static u16 fake_get_pan_id(const struct net_device *dev)
  67 {
  68         BUG_ON(dev->type != ARPHRD_IEEE802154);
  69
  70         return 0xeba1;
  71 }
  72
  73 /**
  74  * fake_get_short_addr - Retrieve the short address of the device.
  75  * @dev: The network device to retrieve the short address of.
  76  *
  77  * Returns the IEEE 802.15.4 short-form address cached for this
  78  * device. If the device has not yet had a short address assigned
  79  * then this should return 0xFFFF to indicate a lack of association.
  80  */
  81 static u16 fake_get_short_addr(const struct net_device *dev)
  82 {
  83         BUG_ON(dev->type != ARPHRD_IEEE802154);
  84
  85         return 0x1;
  86 }
  87
  88 /**
  89  * fake_get_dsn - Retrieve the DSN of the device.
  90  * @dev: The network device to retrieve the DSN for.
  91  *
  92  * Returns the IEEE 802.15.4 DSN for the network device.
  93  * The DSN is the sequence number which will be added to each
  94  * packet or MAC command frame by the MAC during transmission.
  95  *
  96  * DSN means 'Data Sequence Number'.
  97  *
  98  * Note: This is in section 7.2.1.2 of the IEEE 802.15.4-2006
  99  *       document.
 100  */
 101 static u8 fake_get_dsn(const struct net_device *dev)
 102 {
 103         BUG_ON(dev->type != ARPHRD_IEEE802154);
 104
 105         return 0x00; /* DSN are implemented in HW, so return just 0 */
 106 }
 107
 108 /**
 109  * fake_assoc_req - Make an association request to the HW.
 110  * @dev: The network device which we are associating to a network.
 111  * @addr: The coordinator with which we wish to associate.
 112  * @channel: The channel on which to associate.
 113  * @cap: The capability information field to use in the association.
 114  *
 115  * Start an association with a coordinator. The coordinator's address
 116  * and PAN ID can be found in @addr.
 117  *
 118  * Note: This is in section 7.3.1 and 7.5.3.1 of the IEEE
 119  *       802.15.4-2006 document.
 120  */
 121 static int fake_assoc_req(struct net_device *dev,
 122                 struct ieee802154_addr *addr, u8 channel, u8 page, u8 cap)
 123 {
 124         struct wpan_phy *phy = fake_to_phy(dev);
 125
 126         mutex_lock(&phy->pib_lock);
 127         phy->current_channel = channel;
 128         phy->current_page = page;
 129         mutex_unlock(&phy->pib_lock);
 130
 131         /* We simply emulate it here */
 132         return ieee802154_nl_assoc_confirm(dev, fake_get_short_addr(dev),
 133                         IEEE802154_SUCCESS);
 134 }
 135
 136 /**
 137  * fake_assoc_resp - Send an association response to a device.
 138  * @dev: The network device on which to send the response.
 139  * @addr: The address of the device to respond to.
 140  * @short_addr: The assigned short address for the device (if any).
 141  * @status: The result of the association request.
 142  *
 143  * Queue the association response of the coordinator to another
 144  * device's attempt to associate with the network which we
 145  * coordinate. This is then added to the indirect-send queue to be
 146  * transmitted to the end device when it polls for data.
 147  *
 148  * Note: This is in section 7.3.2 and 7.5.3.1 of the IEEE
 149  *       802.15.4-2006 document.
 150  */
 151 static int fake_assoc_resp(struct net_device *dev,
 152                 struct ieee802154_addr *addr, u16 short_addr, u8 status)
 153 {
 154         return 0;
 155 }
 156
 157 /**
 158  * fake_disassoc_req - Disassociate a device from a network.
 159  * @dev: The network device on which we're disassociating a device.
 160  * @addr: The device to disassociate from the network.
 161  * @reason: The reason to give to the device for being disassociated.
 162  *
 163  * This sends a disassociation notification to the device being
 164  * disassociated from the network.
 165  *
 166  * Note: This is in section 7.5.3.2 of the IEEE 802.15.4-2006
 167  *       document, with the reason described in 7.3.3.2.
 168  */
 169 static int fake_disassoc_req(struct net_device *dev,
 170                 struct ieee802154_addr *addr, u8 reason)
 171 {
 172         return ieee802154_nl_disassoc_confirm(dev, IEEE802154_SUCCESS);
 173 }
 174
 175 /**
 176  * fake_start_req - Start an IEEE 802.15.4 PAN.
 177  * @dev: The network device on which to start the PAN.
 178  * @addr: The coordinator address to use when starting the PAN.
 179  * @channel: The channel on which to start the PAN.
 180  * @bcn_ord: Beacon order.
 181  * @sf_ord: Superframe order.
 182  * @pan_coord: Whether or not we are the PAN coordinator or just
 183  *             requesting a realignment perhaps?
 184  * @blx: Battery Life Extension feature bitfield.
 185  * @coord_realign: Something to realign something else.
 186  *
 187  * If pan_coord is non-zero then this starts a network with the
 188  * provided parameters, otherwise it attempts a coordinator
 189  * realignment of the stated network instead.
 190  *
 191  * Note: This is in section 7.5.2.3 of the IEEE 802.15.4-2006
 192  * document, with 7.3.8 describing coordinator realignment.
 193  */
 194 static int fake_start_req(struct net_device *dev, struct ieee802154_addr *addr,
 195                                 u8 channel, u8 page,
 196                                 u8 bcn_ord, u8 sf_ord, u8 pan_coord, u8 blx,
 197                                 u8 coord_realign)
 198 {
 199         struct wpan_phy *phy = fake_to_phy(dev);
 200
 201         mutex_lock(&phy->pib_lock);
 202         phy->current_channel = channel;
 203         phy->current_page = page;
 204         mutex_unlock(&phy->pib_lock);
 205
 206         /* We don't emulate beacons here at all, so START should fail */
 207         ieee802154_nl_start_confirm(dev, IEEE802154_INVALID_PARAMETER);
 208         return 0;
 209 }
 210
 211 /**
 212  * fake_scan_req - Start a channel scan.
 213  * @dev: The network device on which to perform a channel scan.
 214  * @type: The type of scan to perform.
 215  * @channels: The channel bitmask to scan.
 216  * @duration: How long to spend on each channel.
 217  *
 218  * This starts either a passive (energy) scan or an active (PAN) scan
 219  * on the channels indicated in the @channels bitmask. The duration of
 220  * the scan is measured in terms of superframe duration. Specifically,
 221  * the scan will spend aBaseSuperFrameDuration * ((2^n) + 1) on each
 222  * channel.
 223  *
 224  * Note: This is in section 7.5.2.1 of the IEEE 802.15.4-2006 document.
 225  */
 226 static int fake_scan_req(struct net_device *dev, u8 type, u32 channels,
 227                 u8 page, u8 duration)
 228 {
 229         u8 edl[27] = {};
 230         return ieee802154_nl_scan_confirm(dev, IEEE802154_SUCCESS, type,
 231                         channels, page,
 232                         type == IEEE802154_MAC_SCAN_ED ? edl : NULL);
 233 }
 234
 235 static struct ieee802154_mlme_ops fake_mlme = {
 236         .assoc_req = fake_assoc_req,
 237         .assoc_resp = fake_assoc_resp,
 238         .disassoc_req = fake_disassoc_req,
 239         .start_req = fake_start_req,
 240         .scan_req = fake_scan_req,
 241
 242         .get_phy = fake_get_phy,
 243
 244         .get_pan_id = fake_get_pan_id,
 245         .get_short_addr = fake_get_short_addr,
 246         .get_dsn = fake_get_dsn,
 247 };
 248
 249 static int ieee802154_fake_open(struct net_device *dev)
 250 {
 251         netif_start_queue(dev);
 252         return 0;
 253 }
 254
 255 static int ieee802154_fake_close(struct net_device *dev)
 256 {
 257         netif_stop_queue(dev);
 258         return 0;
 259 }
 260
 261 static netdev_tx_t ieee802154_fake_xmit(struct sk_buff *skb,
 262                                               struct net_device *dev)
 263 {
 264         dev->stats.tx_packets++;
 265         dev->stats.tx_bytes += skb->len;
 266
 267         /* FIXME: do hardware work here ... */
 268
 269         dev_kfree_skb(skb);
 270         return NETDEV_TX_OK;
 271 }
 272
 273
 274 static int ieee802154_fake_ioctl(struct net_device *dev, struct ifreq *ifr,
 275                 int cmd)
 276 {
 277         struct sockaddr_ieee802154 *sa =
 278                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
 279         u16 pan_id, short_addr;
 280
 281         switch (cmd) {
 282         case SIOCGIFADDR:
 283                 /* FIXME: fixed here, get from device IRL */
 284                 pan_id = fake_get_pan_id(dev);
 285                 short_addr = fake_get_short_addr(dev);
 286                 if (pan_id == IEEE802154_PANID_BROADCAST ||
 287                     short_addr == IEEE802154_ADDR_BROADCAST)
 288                         return -EADDRNOTAVAIL;
 289
 290                 sa->family = AF_IEEE802154;
 291                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
 292                 sa->addr.pan_id = pan_id;
 293                 sa->addr.short_addr = short_addr;
 294                 return 0;
 295         }
 296         return -ENOIOCTLCMD;
 297 }
 298
 299 static int ieee802154_fake_mac_addr(struct net_device *dev, void *p)
 300 {
 301         return -EBUSY; /* HW address is built into the device */
 302 }
 303
 304 static const struct net_device_ops fake_ops = {
 305         .ndo_open               = ieee802154_fake_open,
 306         .ndo_stop               = ieee802154_fake_close,
 307         .ndo_start_xmit         = ieee802154_fake_xmit,
 308         .ndo_do_ioctl           = ieee802154_fake_ioctl,
 309         .ndo_set_mac_address    = ieee802154_fake_mac_addr,
 310 };
 311
 312 static void ieee802154_fake_destruct(struct net_device *dev)
 313 {
 314         struct wpan_phy *phy = fake_to_phy(dev);
 315
 316         wpan_phy_unregister(phy);
 317         free_netdev(dev);
 318         wpan_phy_free(phy);
 319 }
 320
 321 static void ieee802154_fake_setup(struct net_device *dev)
 322 {
 323         dev->addr_len           = IEEE802154_ADDR_LEN;
 324         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 325         dev->features           = NETIF_F_HW_CSUM;
 326         dev->needed_tailroom    = 2; /* FCS */
 327         dev->mtu                = 127;
 328         dev->tx_queue_len       = 10;
 329         dev->type               = ARPHRD_IEEE802154;
 330         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 331         dev->watchdog_timeo     = 0;
 332         dev->destructor         = ieee802154_fake_destruct;
 333 }
 334
 335
 336 static int ieee802154fake_probe(struct platform_device *pdev)
 337 {
 338         struct net_device *dev;
 339         struct fakehard_priv *priv;
 340         struct wpan_phy *phy = wpan_phy_alloc(0);
 341         int err;
 342
 343         if (!phy)
 344                 return -ENOMEM;
 345
 346         dev = alloc_netdev(sizeof(struct fakehard_priv), "hardwpan%d", ieee802154_fake_setup);
 347         if (!dev) {
 348                 wpan_phy_free(phy);
 349                 return -ENOMEM;
 350         }
 351
 352         memcpy(dev->dev_addr, "\xba\xbe\xca\xfe\xde\xad\xbe\xef",
 353                         dev->addr_len);
 354
 355         /*
 356          * For now we'd like to emulate 2.4 GHz-only device,
 357          * both O-QPSK and CSS
 358          */
 359         /* 2.4 GHz O-QPSK 802.15.4-2003 */
 360         phy->channels_supported[0] |= 0x7FFF800;
 361         /* 2.4 GHz CSS 802.15.4a-2007 */
 362         phy->channels_supported[3] |= 0x3fff;
 363
 364         phy->transmit_power = 0xbf;
 365
 366         dev->netdev_ops = &fake_ops;
 367         dev->ml_priv = &fake_mlme;
 368
 369         priv = netdev_priv(dev);
 370         priv->phy = phy;
 371
 372         wpan_phy_set_dev(phy, &pdev->dev);
 373         SET_NETDEV_DEV(dev, &phy->dev);
 374
 375         platform_set_drvdata(pdev, dev);
 376
 377         err = wpan_phy_register(phy);
 378         if (err)
 379                 goto out;
 380
 381         err = register_netdev(dev);
 382         if (err < 0)
 383                 goto out;
 384
 385         dev_info(&pdev->dev, "Added ieee802154 HardMAC hardware\n");
 386         return 0;
 387
 388 out:
 389         unregister_netdev(dev);
 390         return err;
 391 }
 392
 393 static int ieee802154fake_remove(struct platform_device *pdev)
 394 {
 395         struct net_device *dev = platform_get_drvdata(pdev);
 396         unregister_netdev(dev);
 397         return 0;
 398 }
 399
 400 static struct platform_device *ieee802154fake_dev;
 401
 402 static struct platform_driver ieee802154fake_driver = {
 403         .probe = ieee802154fake_probe,
 404         .remove = ieee802154fake_remove,
 405         .driver = {
 406                         .name = "ieee802154hardmac",
 407                         .owner = THIS_MODULE,
 408         },
 409 };
 410
 411 static __init int fake_init(void)
 412 {
 413         ieee802154fake_dev = platform_device_register_simple(
 414                         "ieee802154hardmac", -1, NULL, 0);
 415         return platform_driver_register(&ieee802154fake_driver);
 416 }
 417
 418 static __exit void fake_exit(void)
 419 {
 420         platform_driver_unregister(&ieee802154fake_driver);
 421         platform_device_unregister(ieee802154fake_dev);
 422 }
 423
 424 module_init(fake_init);
 425 module_exit(fake_exit);
 426 MODULE_LICENSE("GPL");