drivers/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/ieee802154/af_ieee802154.h>
  30 #include <net/ieee802154/netdevice.h>
  31 #include <net/ieee802154/mac_def.h>
  32 #include <net/ieee802154/nl802154.h>
  33
  34 static u16 fake_get_pan_id(struct net_device *dev)
  35 {
  36         BUG_ON(dev->type != ARPHRD_IEEE802154);
  37
  38         return 0xeba1;
  39 }
  40
  41 static u16 fake_get_short_addr(struct net_device *dev)
  42 {
  43         BUG_ON(dev->type != ARPHRD_IEEE802154);
  44
  45         return 0x1;
  46 }
  47
  48 static u8 fake_get_dsn(struct net_device *dev)
  49 {
  50         BUG_ON(dev->type != ARPHRD_IEEE802154);
  51
  52         return 0x00; /* DSN are implemented in HW, so return just 0 */
  53 }
  54
  55 static u8 fake_get_bsn(struct net_device *dev)
  56 {
  57         BUG_ON(dev->type != ARPHRD_IEEE802154);
  58
  59         return 0x00; /* BSN are implemented in HW, so return just 0 */
  60 }
  61
  62 static int fake_assoc_req(struct net_device *dev,
  63                 struct ieee802154_addr *addr, u8 channel, u8 cap)
  64 {
  65         /* We simply emulate it here */
  66         return ieee802154_nl_assoc_confirm(dev, fake_get_short_addr(dev),
  67                         IEEE802154_SUCCESS);
  68 }
  69
  70 static int fake_assoc_resp(struct net_device *dev,
  71                 struct ieee802154_addr *addr, u16 short_addr, u8 status)
  72 {
  73         return 0;
  74 }
  75
  76 static int fake_disassoc_req(struct net_device *dev,
  77                 struct ieee802154_addr *addr, u8 reason)
  78 {
  79         return ieee802154_nl_disassoc_confirm(dev, IEEE802154_SUCCESS);
  80 }
  81
  82 static int fake_start_req(struct net_device *dev, struct ieee802154_addr *addr,
  83                                 u8 channel,
  84                                 u8 bcn_ord, u8 sf_ord, u8 pan_coord, u8 blx,
  85                                 u8 coord_realign)
  86 {
  87         return 0;
  88 }
  89
  90 static int fake_scan_req(struct net_device *dev, u8 type, u32 channels,
  91                 u8 duration)
  92 {
  93         u8 edl[27] = {};
  94         return ieee802154_nl_scan_confirm(dev, IEEE802154_SUCCESS, type,
  95                         channels,
  96                         type == IEEE802154_MAC_SCAN_ED ? edl : NULL);
  97 }
  98
  99 static struct ieee802154_mlme_ops fake_mlme = {
 100         .assoc_req = fake_assoc_req,
 101         .assoc_resp = fake_assoc_resp,
 102         .disassoc_req = fake_disassoc_req,
 103         .start_req = fake_start_req,
 104         .scan_req = fake_scan_req,
 105
 106         .get_pan_id = fake_get_pan_id,
 107         .get_short_addr = fake_get_short_addr,
 108         .get_dsn = fake_get_dsn,
 109         .get_bsn = fake_get_bsn,
 110 };
 111
 112 static int ieee802154_fake_open(struct net_device *dev)
 113 {
 114         netif_start_queue(dev);
 115         return 0;
 116 }
 117
 118 static int ieee802154_fake_close(struct net_device *dev)
 119 {
 120         netif_stop_queue(dev);
 121         return 0;
 122 }
 123
 124 static int ieee802154_fake_xmit(struct sk_buff *skb, struct net_device *dev)
 125 {
 126         skb->iif = dev->ifindex;
 127         skb->dev = dev;
 128         dev->stats.tx_packets++;
 129         dev->stats.tx_bytes += skb->len;
 130
 131         dev->trans_start = jiffies;
 132
 133         /* FIXME: do hardware work here ... */
 134
 135         return NETDEV_TX_OK;
 136 }
 137
 138
 139 static int ieee802154_fake_ioctl(struct net_device *dev, struct ifreq *ifr,
 140                 int cmd)
 141 {
 142         struct sockaddr_ieee802154 *sa =
 143                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
 144         u16 pan_id, short_addr;
 145
 146         switch (cmd) {
 147         case SIOCGIFADDR:
 148                 /* FIXME: fixed here, get from device IRL */
 149                 pan_id = fake_get_pan_id(dev);
 150                 short_addr = fake_get_short_addr(dev);
 151                 if (pan_id == IEEE802154_PANID_BROADCAST ||
 152                     short_addr == IEEE802154_ADDR_BROADCAST)
 153                         return -EADDRNOTAVAIL;
 154
 155                 sa->family = AF_IEEE802154;
 156                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
 157                 sa->addr.pan_id = pan_id;
 158                 sa->addr.short_addr = short_addr;
 159                 return 0;
 160         }
 161         return -ENOIOCTLCMD;
 162 }
 163
 164 static int ieee802154_fake_mac_addr(struct net_device *dev, void *p)
 165 {
 166         return -EBUSY; /* HW address is built into the device */
 167 }
 168
 169 static const struct net_device_ops fake_ops = {
 170         .ndo_open               = ieee802154_fake_open,
 171         .ndo_stop               = ieee802154_fake_close,
 172         .ndo_start_xmit         = ieee802154_fake_xmit,
 173         .ndo_do_ioctl           = ieee802154_fake_ioctl,
 174         .ndo_set_mac_address    = ieee802154_fake_mac_addr,
 175 };
 176
 177
 178 static void ieee802154_fake_setup(struct net_device *dev)
 179 {
 180         dev->addr_len           = IEEE802154_ADDR_LEN;
 181         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 182         dev->features           = NETIF_F_NO_CSUM;
 183         dev->needed_tailroom    = 2; /* FCS */
 184         dev->mtu                = 127;
 185         dev->tx_queue_len       = 10;
 186         dev->type               = ARPHRD_IEEE802154;
 187         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 188         dev->watchdog_timeo     = 0;
 189 }
 190
 191
 192 static int __devinit ieee802154fake_probe(struct platform_device *pdev)
 193 {
 194         struct net_device *dev =
 195                 alloc_netdev(0, "hardwpan%d", ieee802154_fake_setup);
 196         int err;
 197
 198         if (!dev)
 199                 return -ENOMEM;
 200
 201         memcpy(dev->dev_addr, "\xba\xbe\xca\xfe\xde\xad\xbe\xef",
 202                         dev->addr_len);
 203         memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
 204
 205         dev->netdev_ops = &fake_ops;
 206         dev->ml_priv = &fake_mlme;
 207
 208         /*
 209          * If the name is a format string the caller wants us to do a
 210          * name allocation.
 211          */
 212         if (strchr(dev->name, '%')) {
 213                 err = dev_alloc_name(dev, dev->name);
 214                 if (err < 0)
 215                         goto out;
 216         }
 217
 218         SET_NETDEV_DEV(dev, &pdev->dev);
 219
 220         platform_set_drvdata(pdev, dev);
 221
 222         err = register_netdev(dev);
 223         if (err < 0)
 224                 goto out;
 225
 226
 227         dev_info(&pdev->dev, "Added ieee802154 HardMAC hardware\n");
 228         return 0;
 229
 230 out:
 231         unregister_netdev(dev);
 232         return err;
 233 }
 234
 235 static int __devexit ieee802154fake_remove(struct platform_device *pdev)
 236 {
 237         struct net_device *dev = platform_get_drvdata(pdev);
 238         unregister_netdev(dev);
 239         free_netdev(dev);
 240         return 0;
 241 }
 242
 243 static struct platform_device *ieee802154fake_dev;
 244
 245 static struct platform_driver ieee802154fake_driver = {
 246         .probe = ieee802154fake_probe,
 247         .remove = __devexit_p(ieee802154fake_remove),
 248         .driver = {
 249                         .name = "ieee802154hardmac",
 250                         .owner = THIS_MODULE,
 251         },
 252 };
 253
 254 static __init int fake_init(void)
 255 {
 256         ieee802154fake_dev = platform_device_register_simple(
 257                         "ieee802154hardmac", -1, NULL, 0);
 258         return platform_driver_register(&ieee802154fake_driver);
 259 }
 260
 261 static __exit void fake_exit(void)
 262 {
 263         platform_driver_unregister(&ieee802154fake_driver);
 264         platform_device_unregister(ieee802154fake_dev);
 265 }
 266
 267 module_init(fake_init);
 268 module_exit(fake_exit);
 269 MODULE_LICENSE("GPL");
 270