Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 | // SPDX-License-Identifier: GPL-2.0-or-later /*****************************************************************************/ /* * hdlcdrv.c -- HDLC packet radio network driver. * * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) * * Please note that the GPL allows you to use the driver, NOT the radio. * In order to use the radio, you need a license from the communications * authority of your country. * * The driver was derived from Donald Beckers skeleton.c * Written 1993-94 by Donald Becker. * * History: * 0.1 21.09.1996 Started * 18.10.1996 Changed to new user space access routines * (copy_{to,from}_user) * 0.2 21.11.1996 various small changes * 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module * 0.4 16.04.1997 init code/data tagged * 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the * soundmodem driver) * 0.6 05.04.1998 add spinlocks * 0.7 03.08.1999 removed some old compatibility cruft * 0.8 12.02.2000 adapted to softnet driver interface */ /*****************************************************************************/ #include <linux/capability.h> #include <linux/compat.h> #include <linux/module.h> #include <linux/types.h> #include <linux/net.h> #include <linux/in.h> #include <linux/if.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/bitops.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <linux/hdlcdrv.h> #include <linux/random.h> #include <net/ax25.h> #include <linux/uaccess.h> #include <linux/crc-ccitt.h> /* --------------------------------------------------------------------- */ #define KISS_VERBOSE /* --------------------------------------------------------------------- */ #define PARAM_TXDELAY 1 #define PARAM_PERSIST 2 #define PARAM_SLOTTIME 3 #define PARAM_TXTAIL 4 #define PARAM_FULLDUP 5 #define PARAM_HARDWARE 6 #define PARAM_RETURN 255 /* --------------------------------------------------------------------- */ /* * the CRC routines are stolen from WAMPES * by Dieter Deyke */ /*---------------------------------------------------------------------------*/ static inline void append_crc_ccitt(unsigned char *buffer, int len) { unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; buffer += len; *buffer++ = crc; *buffer++ = crc >> 8; } /*---------------------------------------------------------------------------*/ static inline int check_crc_ccitt(const unsigned char *buf, int cnt) { return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; } /*---------------------------------------------------------------------------*/ #if 0 static int calc_crc_ccitt(const unsigned char *buf, int cnt) { unsigned int crc = 0xffff; for (; cnt > 0; cnt--) crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; crc ^= 0xffff; return crc & 0xffff; } #endif /* ---------------------------------------------------------------------- */ #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) /* ---------------------------------------------------------------------- */ /* * The HDLC routines */ static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, int num) { int added = 0; while (s->hdlcrx.rx_state && num >= 8) { if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { s->hdlcrx.rx_state = 0; return 0; } *s->hdlcrx.bp++ = bits >> (32-num); s->hdlcrx.len++; num -= 8; added += 8; } return added; } static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) { struct sk_buff *skb; int pkt_len; unsigned char *cp; if (s->hdlcrx.len < 4) return; if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) return; pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ if (!(skb = dev_alloc_skb(pkt_len))) { printk("%s: memory squeeze, dropping packet\n", dev->name); dev->stats.rx_dropped++; return; } cp = skb_put(skb, pkt_len); *cp++ = 0; /* KISS kludge */ memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); skb->protocol = ax25_type_trans(skb, dev); netif_rx(skb); dev->stats.rx_packets++; } void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) { int i; unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; if (!s || s->magic != HDLCDRV_MAGIC) return; if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) return; while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); #ifdef HDLCDRV_DEBUG hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); #endif /* HDLCDRV_DEBUG */ s->hdlcrx.bitstream >>= 16; s->hdlcrx.bitstream |= word << 16; s->hdlcrx.bitbuf >>= 16; s->hdlcrx.bitbuf |= word << 16; s->hdlcrx.numbits += 16; for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; i >= 0; i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, mask5 <<= 1, mask6 = (mask6 << 1) | 1) { if ((s->hdlcrx.bitstream & mask1) == mask1) s->hdlcrx.rx_state = 0; /* abort received */ else if ((s->hdlcrx.bitstream & mask2) == mask3) { /* flag received */ if (s->hdlcrx.rx_state) { hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf << (8+i), s->hdlcrx.numbits -8-i); hdlc_rx_flag(dev, s); } s->hdlcrx.len = 0; s->hdlcrx.bp = s->hdlcrx.buffer; s->hdlcrx.rx_state = 1; s->hdlcrx.numbits = i; } else if ((s->hdlcrx.bitstream & mask4) == mask5) { /* stuffed bit */ s->hdlcrx.numbits--; s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | ((s->hdlcrx.bitbuf & mask6) << 1); } } s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, s->hdlcrx.numbits); } clear_bit(0, &s->hdlcrx.in_hdlc_rx); } /* ---------------------------------------------------------------------- */ static inline void do_kiss_params(struct hdlcdrv_state *s, unsigned char *data, unsigned long len) { #ifdef KISS_VERBOSE #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) #else /* KISS_VERBOSE */ #define PKP(a,b) #endif /* KISS_VERBOSE */ if (len < 2) return; switch(data[0]) { case PARAM_TXDELAY: s->ch_params.tx_delay = data[1]; PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); break; case PARAM_PERSIST: s->ch_params.ppersist = data[1]; PKP("p persistence = %u", s->ch_params.ppersist); break; case PARAM_SLOTTIME: s->ch_params.slottime = data[1]; PKP("slot time = %ums", s->ch_params.slottime); break; case PARAM_TXTAIL: s->ch_params.tx_tail = data[1]; PKP("TX tail = %ums", s->ch_params.tx_tail); break; case PARAM_FULLDUP: s->ch_params.fulldup = !!data[1]; PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); break; default: break; } #undef PKP } /* ---------------------------------------------------------------------- */ void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) { unsigned int mask1, mask2, mask3; int i; struct sk_buff *skb; int pkt_len; if (!s || s->magic != HDLCDRV_MAGIC) return; if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) return; for (;;) { if (s->hdlctx.numbits >= 16) { if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { clear_bit(0, &s->hdlctx.in_hdlc_tx); return; } hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); s->hdlctx.bitbuf >>= 16; s->hdlctx.numbits -= 16; } switch (s->hdlctx.tx_state) { default: clear_bit(0, &s->hdlctx.in_hdlc_tx); return; case 0: case 1: if (s->hdlctx.numflags) { s->hdlctx.numflags--; s->hdlctx.bitbuf |= 0x7e7e << s->hdlctx.numbits; s->hdlctx.numbits += 16; break; } if (s->hdlctx.tx_state == 1) { clear_bit(0, &s->hdlctx.in_hdlc_tx); return; } if (!(skb = s->skb)) { int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); if (flgs < 2) flgs = 2; s->hdlctx.tx_state = 1; s->hdlctx.numflags = flgs; break; } s->skb = NULL; netif_wake_queue(dev); pkt_len = skb->len-1; /* strip KISS byte */ if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { s->hdlctx.tx_state = 0; s->hdlctx.numflags = 1; dev_kfree_skb_irq(skb); break; } skb_copy_from_linear_data_offset(skb, 1, s->hdlctx.buffer, pkt_len); dev_kfree_skb_irq(skb); s->hdlctx.bp = s->hdlctx.buffer; append_crc_ccitt(s->hdlctx.buffer, pkt_len); s->hdlctx.len = pkt_len+2; /* the appended CRC */ s->hdlctx.tx_state = 2; s->hdlctx.bitstream = 0; dev->stats.tx_packets++; break; case 2: if (!s->hdlctx.len) { s->hdlctx.tx_state = 0; s->hdlctx.numflags = 1; break; } s->hdlctx.len--; s->hdlctx.bitbuf |= *s->hdlctx.bp << s->hdlctx.numbits; s->hdlctx.bitstream >>= 8; s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; mask1 = 0x1f000; mask2 = 0x10000; mask3 = 0xffffffff >> (31-s->hdlctx.numbits); s->hdlctx.numbits += 8; for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, mask3 = (mask3 << 1) | 1) { if ((s->hdlctx.bitstream & mask1) != mask1) continue; s->hdlctx.bitstream &= ~mask2; s->hdlctx.bitbuf = (s->hdlctx.bitbuf & mask3) | ((s->hdlctx.bitbuf & (~mask3)) << 1); s->hdlctx.numbits++; mask3 = (mask3 << 1) | 1; } break; } } } /* ---------------------------------------------------------------------- */ static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) { s->hdlctx.tx_state = 0; s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; hdlcdrv_transmitter(dev, s); s->hdlctx.ptt = 1; s->ptt_keyed++; } /* ---------------------------------------------------------------------- */ void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) { if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) return; if (s->ch_params.fulldup) { start_tx(dev, s); return; } if (s->hdlcrx.dcd) { s->hdlctx.slotcnt = s->ch_params.slottime; return; } if ((--s->hdlctx.slotcnt) > 0) return; s->hdlctx.slotcnt = s->ch_params.slottime; if (get_random_u8() > s->ch_params.ppersist) return; start_tx(dev, s); } /* --------------------------------------------------------------------- */ /* * ===================== network driver interface ========================= */ static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev) { struct hdlcdrv_state *sm = netdev_priv(dev); if (skb->protocol == htons(ETH_P_IP)) return ax25_ip_xmit(skb); if (skb->data[0] != 0) { do_kiss_params(sm, skb->data, skb->len); dev_kfree_skb(skb); return NETDEV_TX_OK; } if (sm->skb) { dev_kfree_skb(skb); return NETDEV_TX_OK; } netif_stop_queue(dev); sm->skb = skb; return NETDEV_TX_OK; } /* --------------------------------------------------------------------- */ static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr *sa = (struct sockaddr *)addr; /* addr is an AX.25 shifted ASCII mac address */ dev_addr_set(dev, sa->sa_data); return 0; } /* --------------------------------------------------------------------- */ /* * Open/initialize the board. This is called (in the current kernel) * sometime after booting when the 'ifconfig' program is run. * * This routine should set everything up anew at each open, even * registers that "should" only need to be set once at boot, so that * there is non-reboot way to recover if something goes wrong. */ static int hdlcdrv_open(struct net_device *dev) { struct hdlcdrv_state *s = netdev_priv(dev); int i; if (!s->ops || !s->ops->open) return -ENODEV; /* * initialise some variables */ s->opened = 1; s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; s->hdlcrx.in_hdlc_rx = 0; s->hdlcrx.rx_state = 0; s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; s->hdlctx.in_hdlc_tx = 0; s->hdlctx.tx_state = 1; s->hdlctx.numflags = 0; s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; s->hdlctx.ptt = 0; s->hdlctx.slotcnt = s->ch_params.slottime; s->hdlctx.calibrate = 0; i = s->ops->open(dev); if (i) return i; netif_start_queue(dev); return 0; } /* --------------------------------------------------------------------- */ /* * The inverse routine to hdlcdrv_open(). */ static int hdlcdrv_close(struct net_device *dev) { struct hdlcdrv_state *s = netdev_priv(dev); int i = 0; netif_stop_queue(dev); if (s->ops && s->ops->close) i = s->ops->close(dev); dev_kfree_skb(s->skb); s->skb = NULL; s->opened = 0; return i; } /* --------------------------------------------------------------------- */ static int hdlcdrv_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd) { struct hdlcdrv_state *s = netdev_priv(dev); struct hdlcdrv_ioctl bi; if (cmd != SIOCDEVPRIVATE) return -ENOIOCTLCMD; if (in_compat_syscall()) /* to be implemented */ return -ENOIOCTLCMD; if (copy_from_user(&bi, data, sizeof(bi))) return -EFAULT; switch (bi.cmd) { default: if (s->ops && s->ops->ioctl) return s->ops->ioctl(dev, data, &bi, cmd); return -ENOIOCTLCMD; case HDLCDRVCTL_GETCHANNELPAR: bi.data.cp.tx_delay = s->ch_params.tx_delay; bi.data.cp.tx_tail = s->ch_params.tx_tail; bi.data.cp.slottime = s->ch_params.slottime; bi.data.cp.ppersist = s->ch_params.ppersist; bi.data.cp.fulldup = s->ch_params.fulldup; break; case HDLCDRVCTL_SETCHANNELPAR: if (!capable(CAP_NET_ADMIN)) return -EACCES; s->ch_params.tx_delay = bi.data.cp.tx_delay; s->ch_params.tx_tail = bi.data.cp.tx_tail; s->ch_params.slottime = bi.data.cp.slottime; s->ch_params.ppersist = bi.data.cp.ppersist; s->ch_params.fulldup = bi.data.cp.fulldup; s->hdlctx.slotcnt = 1; return 0; case HDLCDRVCTL_GETMODEMPAR: bi.data.mp.iobase = dev->base_addr; bi.data.mp.irq = dev->irq; bi.data.mp.dma = dev->dma; bi.data.mp.dma2 = s->ptt_out.dma2; bi.data.mp.seriobase = s->ptt_out.seriobase; bi.data.mp.pariobase = s->ptt_out.pariobase; bi.data.mp.midiiobase = s->ptt_out.midiiobase; break; case HDLCDRVCTL_SETMODEMPAR: if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) return -EACCES; dev->base_addr = bi.data.mp.iobase; dev->irq = bi.data.mp.irq; dev->dma = bi.data.mp.dma; s->ptt_out.dma2 = bi.data.mp.dma2; s->ptt_out.seriobase = bi.data.mp.seriobase; s->ptt_out.pariobase = bi.data.mp.pariobase; s->ptt_out.midiiobase = bi.data.mp.midiiobase; return 0; case HDLCDRVCTL_GETSTAT: bi.data.cs.ptt = hdlcdrv_ptt(s); bi.data.cs.dcd = s->hdlcrx.dcd; bi.data.cs.ptt_keyed = s->ptt_keyed; bi.data.cs.tx_packets = dev->stats.tx_packets; bi.data.cs.tx_errors = dev->stats.tx_errors; bi.data.cs.rx_packets = dev->stats.rx_packets; bi.data.cs.rx_errors = dev->stats.rx_errors; break; case HDLCDRVCTL_OLDGETSTAT: bi.data.ocs.ptt = hdlcdrv_ptt(s); bi.data.ocs.dcd = s->hdlcrx.dcd; bi.data.ocs.ptt_keyed = s->ptt_keyed; break; case HDLCDRVCTL_CALIBRATE: if(!capable(CAP_SYS_RAWIO)) return -EPERM; if (s->par.bitrate <= 0) return -EINVAL; if (bi.data.calibrate > INT_MAX / s->par.bitrate) return -EINVAL; s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; return 0; case HDLCDRVCTL_GETSAMPLES: #ifndef HDLCDRV_DEBUG return -EPERM; #else /* HDLCDRV_DEBUG */ if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) return -EAGAIN; bi.data.bits = s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % sizeof(s->bitbuf_channel.buffer); break; #endif /* HDLCDRV_DEBUG */ case HDLCDRVCTL_GETBITS: #ifndef HDLCDRV_DEBUG return -EPERM; #else /* HDLCDRV_DEBUG */ if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) return -EAGAIN; bi.data.bits = s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % sizeof(s->bitbuf_hdlc.buffer); break; #endif /* HDLCDRV_DEBUG */ case HDLCDRVCTL_DRIVERNAME: if (s->ops && s->ops->drvname) { strscpy(bi.data.drivername, s->ops->drvname, sizeof(bi.data.drivername)); break; } bi.data.drivername[0] = '\0'; break; } if (copy_to_user(data, &bi, sizeof(bi))) return -EFAULT; return 0; } /* --------------------------------------------------------------------- */ static const struct net_device_ops hdlcdrv_netdev = { .ndo_open = hdlcdrv_open, .ndo_stop = hdlcdrv_close, .ndo_start_xmit = hdlcdrv_send_packet, .ndo_siocdevprivate = hdlcdrv_siocdevprivate, .ndo_set_mac_address = hdlcdrv_set_mac_address, }; /* * Initialize fields in hdlcdrv */ static void hdlcdrv_setup(struct net_device *dev) { static const struct hdlcdrv_channel_params dflt_ch_params = { 20, 2, 10, 40, 0 }; struct hdlcdrv_state *s = netdev_priv(dev); /* * initialize the hdlcdrv_state struct */ s->ch_params = dflt_ch_params; s->ptt_keyed = 0; spin_lock_init(&s->hdlcrx.hbuf.lock); s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; s->hdlcrx.in_hdlc_rx = 0; s->hdlcrx.rx_state = 0; spin_lock_init(&s->hdlctx.hbuf.lock); s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; s->hdlctx.in_hdlc_tx = 0; s->hdlctx.tx_state = 1; s->hdlctx.numflags = 0; s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; s->hdlctx.ptt = 0; s->hdlctx.slotcnt = s->ch_params.slottime; s->hdlctx.calibrate = 0; #ifdef HDLCDRV_DEBUG s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; s->bitbuf_channel.shreg = 0x80; s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; s->bitbuf_hdlc.shreg = 0x80; #endif /* HDLCDRV_DEBUG */ /* Fill in the fields of the device structure */ s->skb = NULL; dev->netdev_ops = &hdlcdrv_netdev; dev->header_ops = &ax25_header_ops; dev->type = ARPHRD_AX25; /* AF_AX25 device */ dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); dev_addr_set(dev, (u8 *)&ax25_defaddr); dev->tx_queue_len = 16; } /* --------------------------------------------------------------------- */ struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, unsigned int privsize, const char *ifname, unsigned int baseaddr, unsigned int irq, unsigned int dma) { struct net_device *dev; struct hdlcdrv_state *s; int err; if (privsize < sizeof(struct hdlcdrv_state)) privsize = sizeof(struct hdlcdrv_state); dev = alloc_netdev(privsize, ifname, NET_NAME_UNKNOWN, hdlcdrv_setup); if (!dev) return ERR_PTR(-ENOMEM); /* * initialize part of the hdlcdrv_state struct */ s = netdev_priv(dev); s->magic = HDLCDRV_MAGIC; s->ops = ops; dev->base_addr = baseaddr; dev->irq = irq; dev->dma = dma; err = register_netdev(dev); if (err < 0) { printk(KERN_WARNING "hdlcdrv: cannot register net " "device %s\n", dev->name); free_netdev(dev); dev = ERR_PTR(err); } return dev; } /* --------------------------------------------------------------------- */ void hdlcdrv_unregister(struct net_device *dev) { struct hdlcdrv_state *s = netdev_priv(dev); BUG_ON(s->magic != HDLCDRV_MAGIC); if (s->opened && s->ops->close) s->ops->close(dev); unregister_netdev(dev); free_netdev(dev); } /* --------------------------------------------------------------------- */ EXPORT_SYMBOL(hdlcdrv_receiver); EXPORT_SYMBOL(hdlcdrv_transmitter); EXPORT_SYMBOL(hdlcdrv_arbitrate); EXPORT_SYMBOL(hdlcdrv_register); EXPORT_SYMBOL(hdlcdrv_unregister); /* --------------------------------------------------------------------- */ static int __init hdlcdrv_init_driver(void) { printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); printk(KERN_INFO "hdlcdrv: version 0.8\n"); return 0; } /* --------------------------------------------------------------------- */ static void __exit hdlcdrv_cleanup_driver(void) { printk(KERN_INFO "hdlcdrv: cleanup\n"); } /* --------------------------------------------------------------------- */ MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); MODULE_LICENSE("GPL"); module_init(hdlcdrv_init_driver); module_exit(hdlcdrv_cleanup_driver); /* --------------------------------------------------------------------- */ |