sys/dev/netif/fwe/if_fwe.c

   1 /*
   2  * Copyright (c) 2002-2003
   3  *      Hidetoshi Shimokawa. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *
  16  *      This product includes software developed by Hidetoshi Shimokawa.
  17  *
  18  * 4. Neither the name of the author nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD: src/sys/dev/firewire/if_fwe.c,v 1.27 2004/01/08 14:58:09 simokawa Exp $
  35  * $DragonFly: src/sys/dev/netif/fwe/if_fwe.c,v 1.22 2005/11/22 00:24:32 dillon Exp $
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_polling.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/conf.h>
  43 #include <sys/kernel.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/socket.h>
  47 #include <sys/sockio.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/systm.h>
  50 #include <sys/module.h>
  51 #include <sys/bus.h>
  52 #include <sys/thread2.h>
  53 #include <machine/bus.h>
  54
  55 #include <net/bpf.h>
  56 #include <net/ethernet.h>
  57 #include <net/if.h>
  58 #include <net/if_arp.h>
  59 #ifdef __DragonFly__
  60 #include <net/ifq_var.h>
  61 #include <net/vlan/if_vlan_var.h>
  62 #include <bus/firewire/firewire.h>
  63 #include <bus/firewire/firewirereg.h>
  64 #include "if_fwevar.h"
  65 #else
  66 #include <net/if_vlan_var.h>
  67
  68 #include <dev/firewire/firewire.h>
  69 #include <dev/firewire/firewirereg.h>
  70 #include <dev/firewire/if_fwevar.h>
  71 #endif
  72
  73 #define FWEDEBUG        if (fwedebug) if_printf
  74 #define TX_MAX_QUEUE    (FWMAXQUEUE - 1)
  75
  76 /* network interface */
  77 static void fwe_start (struct ifnet *);
  78 static int fwe_ioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
  79 static void fwe_init (void *);
  80
  81 static void fwe_output_callback (struct fw_xfer *);
  82 static void fwe_as_output (struct fwe_softc *, struct ifnet *);
  83 static void fwe_as_input (struct fw_xferq *);
  84
  85 static int fwedebug = 0;
  86 static int stream_ch = 1;
  87 static int tx_speed = 2;
  88 static int rx_queue_len = FWMAXQUEUE;
  89
  90 MALLOC_DEFINE(M_FWE, "if_fwe", "Ethernet over FireWire interface");
  91 SYSCTL_INT(_debug, OID_AUTO, if_fwe_debug, CTLFLAG_RW, &fwedebug, 0, "");
  92 SYSCTL_DECL(_hw_firewire);
  93 SYSCTL_NODE(_hw_firewire, OID_AUTO, fwe, CTLFLAG_RD, 0,
  94         "Ethernet emulation subsystem");
  95 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, stream_ch, CTLFLAG_RW, &stream_ch, 0,
  96         "Stream channel to use");
  97 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, tx_speed, CTLFLAG_RW, &tx_speed, 0,
  98         "Transmission speed");
  99 SYSCTL_INT(_hw_firewire_fwe, OID_AUTO, rx_queue_len, CTLFLAG_RW, &rx_queue_len,
 100         0, "Length of the receive queue");
 101
 102 TUNABLE_INT("hw.firewire.fwe.stream_ch", &stream_ch);
 103 TUNABLE_INT("hw.firewire.fwe.tx_speed", &tx_speed);
 104 TUNABLE_INT("hw.firewire.fwe.rx_queue_len", &rx_queue_len);
 105
 106 #ifdef DEVICE_POLLING
 107
 108 static void
 109 fwe_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
 110 {
 111         struct fwe_softc *fwe;
 112         struct firewire_comm *fc;
 113
 114         fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 115         fc = fwe->fd.fc;
 116         switch(cmd) {
 117         case POLL_REGISTER:
 118                 /* disable interrupts */
 119                 fc->set_intr(fc, 0);
 120                 break;
 121         case POLL_DEREGISTER:
 122                 /* enable interrupts */
 123                 fc->set_intr(fc, 1);
 124                 break;
 125         default:
 126                 fc->poll(fc, (cmd == POLL_AND_CHECK_STATUS)?0:1, count);
 127                 break;
 128         }
 129 }
 130
 131 #endif
 132
 133 static int
 134 fwe_probe(device_t dev)
 135 {
 136         device_t pa;
 137
 138         pa = device_get_parent(dev);
 139         if(device_get_unit(dev) != device_get_unit(pa)){
 140                 return(ENXIO);
 141         }
 142
 143         device_set_desc(dev, "Ethernet over FireWire");
 144         return (0);
 145 }
 146
 147 static int
 148 fwe_attach(device_t dev)
 149 {
 150         struct fwe_softc *fwe;
 151         struct ifnet *ifp;
 152         uint8_t eaddr[ETHER_ADDR_LEN];
 153         struct fw_eui64 *eui;
 154
 155         fwe = ((struct fwe_softc *)device_get_softc(dev));
 156
 157         /* XXX */
 158         fwe->stream_ch = stream_ch;
 159         fwe->dma_ch = -1;
 160
 161         fwe->fd.fc = device_get_ivars(dev);
 162         if (tx_speed < 0)
 163                 tx_speed = fwe->fd.fc->speed;
 164
 165         fwe->fd.dev = dev;
 166         fwe->fd.post_explore = NULL;
 167         fwe->eth_softc.fwe = fwe;
 168
 169         fwe->pkt_hdr.mode.stream.tcode = FWTCODE_STREAM;
 170         fwe->pkt_hdr.mode.stream.sy = 0;
 171         fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 172
 173         /* generate fake MAC address: first and last 3bytes from eui64 */
 174 #define LOCAL (0x02)
 175 #define GROUP (0x01)
 176
 177         eui = &fwe->fd.fc->eui;
 178         eaddr[0] = (FW_EUI64_BYTE(eui, 0) | LOCAL) & ~GROUP;
 179         eaddr[1] = FW_EUI64_BYTE(eui, 1);
 180         eaddr[2] = FW_EUI64_BYTE(eui, 2);
 181         eaddr[3] = FW_EUI64_BYTE(eui, 5);
 182         eaddr[4] = FW_EUI64_BYTE(eui, 6);
 183         eaddr[5] = FW_EUI64_BYTE(eui, 7);
 184
 185         /* fill the rest and attach interface */
 186         ifp = &fwe->fwe_if;
 187         ifp->if_softc = &fwe->eth_softc;
 188
 189         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 190         ifp->if_init = fwe_init;
 191         ifp->if_start = fwe_start;
 192         ifp->if_ioctl = fwe_ioctl;
 193         ifp->if_capabilities = IFCAP_VLAN_MTU;
 194 #ifdef DEVICE_POLLING
 195         ifp->if_poll = fwe_poll;
 196 #endif
 197         ifp->if_mtu = ETHERMTU;
 198         ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
 199         ifq_set_maxlen(&ifp->if_snd, TX_MAX_QUEUE);
 200         ifq_set_ready(&ifp->if_snd);
 201
 202         ether_ifattach(ifp, eaddr);
 203
 204         /* Tell the upper layer(s) we support long frames. */
 205         ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
 206
 207
 208         FWEDEBUG(ifp, "interface created\n");
 209         return 0;
 210 }
 211
 212 static void
 213 fwe_stop(struct fwe_softc *fwe)
 214 {
 215         struct firewire_comm *fc;
 216         struct fw_xferq *xferq;
 217         struct ifnet *ifp = &fwe->fwe_if;
 218         struct fw_xfer *xfer, *next;
 219         int i;
 220
 221         fc = fwe->fd.fc;
 222
 223         ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
 224
 225         if (fwe->dma_ch >= 0) {
 226                 xferq = fc->ir[fwe->dma_ch];
 227
 228                 if (xferq->flag & FWXFERQ_RUNNING)
 229                         fc->irx_disable(fc, fwe->dma_ch);
 230                 xferq->flag &=
 231                         ~(FWXFERQ_MODEMASK | FWXFERQ_OPEN | FWXFERQ_STREAM |
 232                         FWXFERQ_EXTBUF | FWXFERQ_HANDLER | FWXFERQ_CHTAGMASK);
 233                 xferq->hand =  NULL;
 234
 235                 for (i = 0; i < xferq->bnchunk; i ++)
 236                         m_freem(xferq->bulkxfer[i].mbuf);
 237                 free(xferq->bulkxfer, M_FWE);
 238
 239                 for (xfer = STAILQ_FIRST(&fwe->xferlist); xfer != NULL;
 240                                         xfer = next) {
 241                         next = STAILQ_NEXT(xfer, link);
 242                         fw_xfer_free(xfer);
 243                 }
 244                 STAILQ_INIT(&fwe->xferlist);
 245
 246                 xferq->bulkxfer =  NULL;
 247                 fwe->dma_ch = -1;
 248         }
 249 }
 250
 251 static int
 252 fwe_detach(device_t dev)
 253 {
 254         struct fwe_softc *fwe = device_get_softc(dev);
 255
 256         crit_enter();
 257
 258         fwe_stop(fwe);
 259         ether_ifdetach(&fwe->fwe_if);
 260
 261         crit_exit();
 262         return 0;
 263 }
 264
 265 static void
 266 fwe_init(void *arg)
 267 {
 268         struct fwe_softc *fwe = ((struct fwe_eth_softc *)arg)->fwe;
 269         struct firewire_comm *fc;
 270         struct ifnet *ifp = &fwe->fwe_if;
 271         struct fw_xferq *xferq;
 272         struct fw_xfer *xfer;
 273         struct mbuf *m;
 274         int i;
 275
 276         FWEDEBUG(ifp, "initializing\n");
 277
 278         /* XXX keep promiscoud mode */
 279         ifp->if_flags |= IFF_PROMISC;
 280
 281         fc = fwe->fd.fc;
 282 #define START 0
 283         if (fwe->dma_ch < 0) {
 284                 for (i = START; i < fc->nisodma; i ++) {
 285                         xferq = fc->ir[i];
 286                         if ((xferq->flag & FWXFERQ_OPEN) == 0)
 287                                 goto found;
 288                 }
 289                 if_printf(ifp, "no free dma channel\n");
 290                 return;
 291 found:
 292                 fwe->dma_ch = i;
 293                 fwe->stream_ch = stream_ch;
 294                 fwe->pkt_hdr.mode.stream.chtag = fwe->stream_ch;
 295                 /* allocate DMA channel and init packet mode */
 296                 xferq->flag |= FWXFERQ_OPEN | FWXFERQ_EXTBUF |
 297                                 FWXFERQ_HANDLER | FWXFERQ_STREAM;
 298                 xferq->flag &= ~0xff;
 299                 xferq->flag |= fwe->stream_ch & 0xff;
 300                 /* register fwe_input handler */
 301                 xferq->sc = (caddr_t) fwe;
 302                 xferq->hand = fwe_as_input;
 303                 xferq->bnchunk = rx_queue_len;
 304                 xferq->bnpacket = 1;
 305                 xferq->psize = MCLBYTES;
 306                 xferq->queued = 0;
 307                 xferq->buf = NULL;
 308                 xferq->bulkxfer = (struct fw_bulkxfer *) malloc(
 309                         sizeof(struct fw_bulkxfer) * xferq->bnchunk,
 310                                                         M_FWE, M_WAITOK);
 311                 if (xferq->bulkxfer == NULL) {
 312                         if_printf(ifp, "malloc failed\n");
 313                         return;
 314                 }
 315                 STAILQ_INIT(&xferq->stvalid);
 316                 STAILQ_INIT(&xferq->stfree);
 317                 STAILQ_INIT(&xferq->stdma);
 318                 xferq->stproc = NULL;
 319                 for (i = 0; i < xferq->bnchunk; i ++) {
 320                         m = m_getcl(MB_WAIT, MT_DATA, M_PKTHDR);
 321                         xferq->bulkxfer[i].mbuf = m;
 322                         if (m != NULL) {
 323                                 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 324                                 STAILQ_INSERT_TAIL(&xferq->stfree,
 325                                                 &xferq->bulkxfer[i], link);
 326                         } else {
 327                                 if_printf(ifp, "fwe_init: m_getcl failed\n");
 328                         }
 329                 }
 330                 STAILQ_INIT(&fwe->xferlist);
 331                 for (i = 0; i < TX_MAX_QUEUE; i++) {
 332                         xfer = fw_xfer_alloc(M_FWE);
 333                         if (xfer == NULL)
 334                                 break;
 335                         xfer->send.spd = tx_speed;
 336                         xfer->fc = fwe->fd.fc;
 337                         xfer->retry_req = fw_asybusy;
 338                         xfer->sc = (caddr_t)fwe;
 339                         xfer->act.hand = fwe_output_callback;
 340                         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 341                 }
 342         } else
 343                 xferq = fc->ir[fwe->dma_ch];
 344
 345
 346         /* start dma */
 347         if ((xferq->flag & FWXFERQ_RUNNING) == 0)
 348                 fc->irx_enable(fc, fwe->dma_ch);
 349
 350         ifp->if_flags |= IFF_RUNNING;
 351         ifp->if_flags &= ~IFF_OACTIVE;
 352 }
 353
 354
 355 static int
 356 fwe_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 357 {
 358         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 359         struct ifstat *ifs = NULL;
 360         int error = 0, len;
 361
 362         crit_enter();
 363
 364         switch (cmd) {
 365         case SIOCSIFFLAGS:
 366                 if (ifp->if_flags & IFF_UP) {
 367                         if (!(ifp->if_flags & IFF_RUNNING))
 368                                 fwe_init(&fwe->eth_softc);
 369                 } else {
 370                         if (ifp->if_flags & IFF_RUNNING)
 371                                 fwe_stop(fwe);
 372                 }
 373                 /* XXX keep promiscoud mode */
 374                 ifp->if_flags |= IFF_PROMISC;
 375                 break;
 376         case SIOCADDMULTI:
 377         case SIOCDELMULTI:
 378                 break;
 379
 380         case SIOCGIFSTATUS:
 381                 ifs = (struct ifstat *)data;
 382                 len = strlen(ifs->ascii);
 383                 if (len < sizeof(ifs->ascii))
 384                         snprintf(ifs->ascii + len,
 385                                 sizeof(ifs->ascii) - len,
 386                                 "\tch %d dma %d\n",
 387                                         fwe->stream_ch, fwe->dma_ch);
 388                 break;
 389         default:
 390                 error = ether_ioctl(ifp, cmd, data);
 391                 break;
 392         }
 393
 394         crit_exit();
 395
 396         return (error);
 397 }
 398
 399 static void
 400 fwe_output_callback(struct fw_xfer *xfer)
 401 {
 402         struct fwe_softc *fwe;
 403         struct ifnet *ifp;
 404
 405         fwe = (struct fwe_softc *)xfer->sc;
 406         ifp = &fwe->fwe_if;
 407         /* XXX error check */
 408         FWEDEBUG(ifp, "resp = %d\n", xfer->resp);
 409         if (xfer->resp != 0)
 410                 ifp->if_oerrors ++;
 411
 412         m_freem(xfer->mbuf);
 413         fw_xfer_unload(xfer);
 414
 415         crit_enter();
 416
 417         STAILQ_INSERT_TAIL(&fwe->xferlist, xfer, link);
 418
 419         crit_exit();
 420
 421         /* for queue full */
 422         if (!ifq_is_empty(&ifp->if_snd))
 423                 fwe_start(ifp);
 424 }
 425
 426 static void
 427 fwe_start(struct ifnet *ifp)
 428 {
 429         struct fwe_softc *fwe = ((struct fwe_eth_softc *)ifp->if_softc)->fwe;
 430
 431         FWEDEBUG(ifp, "starting\n");
 432
 433         crit_enter();
 434
 435         if (fwe->dma_ch < 0) {
 436                 FWEDEBUG(ifp, "not ready\n");
 437
 438                 ifq_purge(&ifp->if_snd);
 439         } else {
 440                 ifp->if_flags |= IFF_OACTIVE;
 441
 442                 if (!ifq_is_empty(&ifp->if_snd))
 443                         fwe_as_output(fwe, ifp);
 444
 445                 ifp->if_flags &= ~IFF_OACTIVE;
 446         }
 447
 448         crit_exit();
 449 }
 450
 451 #define HDR_LEN 4
 452 #ifndef ETHER_ALIGN
 453 #define ETHER_ALIGN 2
 454 #endif
 455 /* Async. stream output */
 456 static void
 457 fwe_as_output(struct fwe_softc *fwe, struct ifnet *ifp)
 458 {
 459         struct mbuf *m;
 460         struct fw_xfer *xfer;
 461         struct fw_xferq *xferq;
 462         struct fw_pkt *fp;
 463         int i = 0;
 464
 465         xfer = NULL;
 466         xferq = fwe->fd.fc->atq;
 467         while (xferq->queued < xferq->maxq - 1) {
 468                 xfer = STAILQ_FIRST(&fwe->xferlist);
 469                 if (xfer == NULL) {
 470                         if_printf(ifp, "lack of xfer\n");
 471                         return;
 472                 }
 473                 m = ifq_dequeue(&ifp->if_snd, NULL);
 474                 if (m == NULL)
 475                         break;
 476                 STAILQ_REMOVE_HEAD(&fwe->xferlist, link);
 477                 BPF_MTAP(ifp, m);
 478
 479                 /* keep ip packet alignment for alpha */
 480                 M_PREPEND(m, ETHER_ALIGN, MB_DONTWAIT);
 481                 fp = &xfer->send.hdr;
 482                 *(u_int32_t *)&xfer->send.hdr = *(int32_t *)&fwe->pkt_hdr;
 483                 fp->mode.stream.len = m->m_pkthdr.len;
 484                 xfer->mbuf = m;
 485                 xfer->send.pay_len = m->m_pkthdr.len;
 486
 487                 if (fw_asyreq(fwe->fd.fc, -1, xfer) != 0) {
 488                         /* error */
 489                         ifp->if_oerrors ++;
 490                         /* XXX set error code */
 491                         fwe_output_callback(xfer);
 492                 } else {
 493                         ifp->if_opackets ++;
 494                         i++;
 495                 }
 496         }
 497 #if 0
 498         if (i > 1)
 499                 if_printf(ifp, "%d queued\n", i);
 500 #endif
 501         if (i > 0)
 502                 xferq->start(fwe->fd.fc);
 503 }
 504
 505 /* Async. stream output */
 506 static void
 507 fwe_as_input(struct fw_xferq *xferq)
 508 {
 509         struct mbuf *m, *m0;
 510         struct ifnet *ifp;
 511         struct fwe_softc *fwe;
 512         struct fw_bulkxfer *sxfer;
 513         struct fw_pkt *fp;
 514         u_char *c;
 515
 516         fwe = (struct fwe_softc *)xferq->sc;
 517         ifp = &fwe->fwe_if;
 518         while ((sxfer = STAILQ_FIRST(&xferq->stvalid)) != NULL) {
 519                 STAILQ_REMOVE_HEAD(&xferq->stvalid, link);
 520                 fp = mtod(sxfer->mbuf, struct fw_pkt *);
 521                 if (fwe->fd.fc->irx_post != NULL)
 522                         fwe->fd.fc->irx_post(fwe->fd.fc, fp->mode.ld);
 523                 m = sxfer->mbuf;
 524
 525                 /* insert new rbuf */
 526                 sxfer->mbuf = m0 = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR);
 527                 if (m0 != NULL) {
 528                         m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
 529                         STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
 530                 } else {
 531                         if_printf(ifp, "fwe_as_input: m_getcl failed\n");
 532                 }
 533
 534                 if (sxfer->resp != 0 || fp->mode.stream.len <
 535                     ETHER_ALIGN + sizeof(struct ether_header)) {
 536                         m_freem(m);
 537                         ifp->if_ierrors ++;
 538                         continue;
 539                 }
 540
 541                 m->m_data += HDR_LEN + ETHER_ALIGN;
 542                 c = mtod(m, char *);
 543                 m->m_len = m->m_pkthdr.len =
 544                                 fp->mode.stream.len - ETHER_ALIGN;
 545                 m->m_pkthdr.rcvif = ifp;
 546 #if 0
 547                 FWEDEBUG(ifp, "%02x %02x %02x %02x %02x %02x\n"
 548                          "%02x %02x %02x %02x %02x %02x\n"
 549                          "%02x %02x %02x %02x\n"
 550                          "%02x %02x %02x %02x\n"
 551                          "%02x %02x %02x %02x\n"
 552                          "%02x %02x %02x %02x\n",
 553                          c[0], c[1], c[2], c[3], c[4], c[5],
 554                          c[6], c[7], c[8], c[9], c[10], c[11],
 555                          c[12], c[13], c[14], c[15],
 556                          c[16], c[17], c[18], c[19],
 557                          c[20], c[21], c[22], c[23],
 558                          c[20], c[21], c[22], c[23]
 559                  );
 560 #endif
 561                 (*ifp->if_input)(ifp, m);
 562                 ifp->if_ipackets ++;
 563         }
 564         if (STAILQ_FIRST(&xferq->stfree) != NULL)
 565                 fwe->fd.fc->irx_enable(fwe->fd.fc, fwe->dma_ch);
 566 }
 567
 568
 569 static devclass_t fwe_devclass;
 570
 571 /*
 572  * Because fwe is a static device that always exists under any attached
 573  * firewire device, and not scanned by the firewire device, we need an
 574  * identify function to install the device.
 575  */
 576 static device_method_t fwe_methods[] = {
 577         /* device interface */
 578         DEVMETHOD(device_identify,      bus_generic_identify_sameunit),
 579         DEVMETHOD(device_probe,         fwe_probe),
 580         DEVMETHOD(device_attach,        fwe_attach),
 581         DEVMETHOD(device_detach,        fwe_detach),
 582         { 0, 0 }
 583 };
 584
 585 static driver_t fwe_driver = {
 586         "fwe",
 587         fwe_methods,
 588         sizeof(struct fwe_softc),
 589 };
 590
 591
 592 DECLARE_DUMMY_MODULE(fwe);
 593 DRIVER_MODULE(fwe, firewire, fwe_driver, fwe_devclass, 0, 0);
 594 MODULE_VERSION(fwe, 1);
 595 MODULE_DEPEND(fwe, firewire, 1, 1, 1);