1/*****************************************************************************/ 2 3/* 4 * hdlcdrv.c -- HDLC packet radio network driver. 5 * 6 * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * Please note that the GPL allows you to use the driver, NOT the radio. 23 * In order to use the radio, you need a license from the communications 24 * authority of your country. 25 * 26 * The driver was derived from Donald Beckers skeleton.c 27 * Written 1993-94 by Donald Becker. 28 * 29 * History: 30 * 0.1 21.09.1996 Started 31 * 18.10.1996 Changed to new user space access routines 32 * (copy_{to,from}_user) 33 * 0.2 21.11.1996 various small changes 34 * 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module 35 * 0.4 16.04.1997 init code/data tagged 36 * 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the 37 * soundmodem driver) 38 * 0.6 05.04.1998 add spinlocks 39 * 0.7 03.08.1999 removed some old compatibility cruft 40 * 0.8 12.02.2000 adapted to softnet driver interface 41 */ 42 43/*****************************************************************************/ 44 45#include <linux/module.h> 46#include <linux/types.h> 47#include <linux/net.h> 48#include <linux/in.h> 49#include <linux/if.h> 50#include <linux/slab.h> 51#include <linux/errno.h> 52#include <linux/init.h> 53#include <linux/bitops.h> 54 55#include <linux/netdevice.h> 56#include <linux/if_arp.h> 57#include <linux/skbuff.h> 58#include <linux/hdlcdrv.h> 59#include <linux/random.h> 60#include <net/ax25.h> 61#include <asm/uaccess.h> 62 63#include <linux/crc-ccitt.h> 64 65/* --------------------------------------------------------------------- */ 66 67#define KISS_VERBOSE 68 69/* --------------------------------------------------------------------- */ 70 71#define PARAM_TXDELAY 1 72#define PARAM_PERSIST 2 73#define PARAM_SLOTTIME 3 74#define PARAM_TXTAIL 4 75#define PARAM_FULLDUP 5 76#define PARAM_HARDWARE 6 77#define PARAM_RETURN 255 78 79/* --------------------------------------------------------------------- */ 80/* 81 * the CRC routines are stolen from WAMPES 82 * by Dieter Deyke 83 */ 84 85 86/*---------------------------------------------------------------------------*/ 87 88static inline void append_crc_ccitt(unsigned char *buffer, int len) 89{ 90 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; 91 *buffer++ = crc; 92 *buffer++ = crc >> 8; 93} 94 95/*---------------------------------------------------------------------------*/ 96 97static inline int check_crc_ccitt(const unsigned char *buf, int cnt) 98{ 99 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; 100} 101 102/*---------------------------------------------------------------------------*/ 103 104 105/* ---------------------------------------------------------------------- */ 106 107#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) 108 109/* ---------------------------------------------------------------------- */ 110/* 111 * The HDLC routines 112 */ 113 114static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, 115 int num) 116{ 117 int added = 0; 118 119 while (s->hdlcrx.rx_state && num >= 8) { 120 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { 121 s->hdlcrx.rx_state = 0; 122 return 0; 123 } 124 *s->hdlcrx.bp++ = bits >> (32-num); 125 s->hdlcrx.len++; 126 num -= 8; 127 added += 8; 128 } 129 return added; 130} 131 132static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) 133{ 134 struct sk_buff *skb; 135 int pkt_len; 136 unsigned char *cp; 137 138 if (s->hdlcrx.len < 4) 139 return; 140 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) 141 return; 142 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ 143 if (!(skb = dev_alloc_skb(pkt_len))) { 144 printk("%s: memory squeeze, dropping packet\n", dev->name); 145 s->stats.rx_dropped++; 146 return; 147 } 148 cp = skb_put(skb, pkt_len); 149 *cp++ = 0; /* KISS kludge */ 150 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); 151 skb->protocol = ax25_type_trans(skb, dev); 152 netif_rx(skb); 153 dev->last_rx = jiffies; 154 s->stats.rx_packets++; 155} 156 157void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) 158{ 159 int i; 160 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; 161 162 if (!s || s->magic != HDLCDRV_MAGIC) 163 return; 164 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) 165 return; 166 167 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { 168 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); 169 170#ifdef HDLCDRV_DEBUG 171 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); 172#endif /* HDLCDRV_DEBUG */ 173 s->hdlcrx.bitstream >>= 16; 174 s->hdlcrx.bitstream |= word << 16; 175 s->hdlcrx.bitbuf >>= 16; 176 s->hdlcrx.bitbuf |= word << 16; 177 s->hdlcrx.numbits += 16; 178 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, 179 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 180 i >= 0; 181 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 182 mask5 <<= 1, mask6 = (mask6 << 1) | 1) { 183 if ((s->hdlcrx.bitstream & mask1) == mask1) 184 s->hdlcrx.rx_state = 0; /* abort received */ 185 else if ((s->hdlcrx.bitstream & mask2) == mask3) { 186 /* flag received */ 187 if (s->hdlcrx.rx_state) { 188 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 189 << (8+i), 190 s->hdlcrx.numbits 191 -8-i); 192 hdlc_rx_flag(dev, s); 193 } 194 s->hdlcrx.len = 0; 195 s->hdlcrx.bp = s->hdlcrx.buffer; 196 s->hdlcrx.rx_state = 1; 197 s->hdlcrx.numbits = i; 198 } else if ((s->hdlcrx.bitstream & mask4) == mask5) { 199 /* stuffed bit */ 200 s->hdlcrx.numbits--; 201 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | 202 ((s->hdlcrx.bitbuf & mask6) << 1); 203 } 204 } 205 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, 206 s->hdlcrx.numbits); 207 } 208 clear_bit(0, &s->hdlcrx.in_hdlc_rx); 209} 210 211/* ---------------------------------------------------------------------- */ 212 213static inline void do_kiss_params(struct hdlcdrv_state *s, 214 unsigned char *data, unsigned long len) 215{ 216 217#ifdef KISS_VERBOSE 218#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) 219#else /* KISS_VERBOSE */ 220#define PKP(a,b) 221#endif /* KISS_VERBOSE */ 222 223 if (len < 2) 224 return; 225 switch(data[0]) { 226 case PARAM_TXDELAY: 227 s->ch_params.tx_delay = data[1]; 228 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); 229 break; 230 case PARAM_PERSIST: 231 s->ch_params.ppersist = data[1]; 232 PKP("p persistence = %u", s->ch_params.ppersist); 233 break; 234 case PARAM_SLOTTIME: 235 s->ch_params.slottime = data[1]; 236 PKP("slot time = %ums", s->ch_params.slottime); 237 break; 238 case PARAM_TXTAIL: 239 s->ch_params.tx_tail = data[1]; 240 PKP("TX tail = %ums", s->ch_params.tx_tail); 241 break; 242 case PARAM_FULLDUP: 243 s->ch_params.fulldup = !!data[1]; 244 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); 245 break; 246 default: 247 break; 248 } 249#undef PKP 250} 251 252/* ---------------------------------------------------------------------- */ 253 254void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) 255{ 256 unsigned int mask1, mask2, mask3; 257 int i; 258 struct sk_buff *skb; 259 int pkt_len; 260 261 if (!s || s->magic != HDLCDRV_MAGIC) 262 return; 263 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) 264 return; 265 for (;;) { 266 if (s->hdlctx.numbits >= 16) { 267 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { 268 clear_bit(0, &s->hdlctx.in_hdlc_tx); 269 return; 270 } 271 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); 272 s->hdlctx.bitbuf >>= 16; 273 s->hdlctx.numbits -= 16; 274 } 275 switch (s->hdlctx.tx_state) { 276 default: 277 clear_bit(0, &s->hdlctx.in_hdlc_tx); 278 return; 279 case 0: 280 case 1: 281 if (s->hdlctx.numflags) { 282 s->hdlctx.numflags--; 283 s->hdlctx.bitbuf |= 284 0x7e7e << s->hdlctx.numbits; 285 s->hdlctx.numbits += 16; 286 break; 287 } 288 if (s->hdlctx.tx_state == 1) { 289 clear_bit(0, &s->hdlctx.in_hdlc_tx); 290 return; 291 } 292 if (!(skb = s->skb)) { 293 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); 294 if (flgs < 2) 295 flgs = 2; 296 s->hdlctx.tx_state = 1; 297 s->hdlctx.numflags = flgs; 298 break; 299 } 300 s->skb = NULL; 301 netif_wake_queue(dev); 302 pkt_len = skb->len-1; /* strip KISS byte */ 303 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { 304 s->hdlctx.tx_state = 0; 305 s->hdlctx.numflags = 1; 306 dev_kfree_skb_irq(skb); 307 break; 308 } 309 skb_copy_from_linear_data_offset(skb, 1, 310 s->hdlctx.buffer, 311 pkt_len); 312 dev_kfree_skb_irq(skb); 313 s->hdlctx.bp = s->hdlctx.buffer; 314 append_crc_ccitt(s->hdlctx.buffer, pkt_len); 315 s->hdlctx.len = pkt_len+2; /* the appended CRC */ 316 s->hdlctx.tx_state = 2; 317 s->hdlctx.bitstream = 0; 318 s->stats.tx_packets++; 319 break; 320 case 2: 321 if (!s->hdlctx.len) { 322 s->hdlctx.tx_state = 0; 323 s->hdlctx.numflags = 1; 324 break; 325 } 326 s->hdlctx.len--; 327 s->hdlctx.bitbuf |= *s->hdlctx.bp << 328 s->hdlctx.numbits; 329 s->hdlctx.bitstream >>= 8; 330 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; 331 mask1 = 0x1f000; 332 mask2 = 0x10000; 333 mask3 = 0xffffffff >> (31-s->hdlctx.numbits); 334 s->hdlctx.numbits += 8; 335 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 336 mask3 = (mask3 << 1) | 1) { 337 if ((s->hdlctx.bitstream & mask1) != mask1) 338 continue; 339 s->hdlctx.bitstream &= ~mask2; 340 s->hdlctx.bitbuf = 341 (s->hdlctx.bitbuf & mask3) | 342 ((s->hdlctx.bitbuf & 343 (~mask3)) << 1); 344 s->hdlctx.numbits++; 345 mask3 = (mask3 << 1) | 1; 346 } 347 break; 348 } 349 } 350} 351 352/* ---------------------------------------------------------------------- */ 353 354static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) 355{ 356 s->hdlctx.tx_state = 0; 357 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); 358 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; 359 hdlcdrv_transmitter(dev, s); 360 s->hdlctx.ptt = 1; 361 s->ptt_keyed++; 362} 363 364/* ---------------------------------------------------------------------- */ 365 366void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) 367{ 368 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 369 return; 370 if (s->ch_params.fulldup) { 371 start_tx(dev, s); 372 return; 373 } 374 if (s->hdlcrx.dcd) { 375 s->hdlctx.slotcnt = s->ch_params.slottime; 376 return; 377 } 378 if ((--s->hdlctx.slotcnt) > 0) 379 return; 380 s->hdlctx.slotcnt = s->ch_params.slottime; 381 if ((random32() % 256) > s->ch_params.ppersist) 382 return; 383 start_tx(dev, s); 384} 385 386/* --------------------------------------------------------------------- */ 387/* 388 * ===================== network driver interface ========================= 389 */ 390 391static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev) 392{ 393 struct hdlcdrv_state *sm = netdev_priv(dev); 394 395 if (skb->data[0] != 0) { 396 do_kiss_params(sm, skb->data, skb->len); 397 dev_kfree_skb(skb); 398 return 0; 399 } 400 if (sm->skb) 401 return -1; 402 netif_stop_queue(dev); 403 sm->skb = skb; 404 return 0; 405} 406 407/* --------------------------------------------------------------------- */ 408 409static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 410{ 411 struct sockaddr *sa = (struct sockaddr *)addr; 412 413 /* addr is an AX.25 shifted ASCII mac address */ 414 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 415 return 0; 416} 417 418/* --------------------------------------------------------------------- */ 419 420static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev) 421{ 422 struct hdlcdrv_state *sm = netdev_priv(dev); 423 424 /* 425 * Get the current statistics. This may be called with the 426 * card open or closed. 427 */ 428 return &sm->stats; 429} 430 431/* --------------------------------------------------------------------- */ 432/* 433 * Open/initialize the board. This is called (in the current kernel) 434 * sometime after booting when the 'ifconfig' program is run. 435 * 436 * This routine should set everything up anew at each open, even 437 * registers that "should" only need to be set once at boot, so that 438 * there is non-reboot way to recover if something goes wrong. 439 */ 440 441static int hdlcdrv_open(struct net_device *dev) 442{ 443 struct hdlcdrv_state *s = netdev_priv(dev); 444 int i; 445 446 if (!s->ops || !s->ops->open) 447 return -ENODEV; 448 449 /* 450 * initialise some variables 451 */ 452 s->opened = 1; 453 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 454 s->hdlcrx.in_hdlc_rx = 0; 455 s->hdlcrx.rx_state = 0; 456 457 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 458 s->hdlctx.in_hdlc_tx = 0; 459 s->hdlctx.tx_state = 1; 460 s->hdlctx.numflags = 0; 461 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 462 s->hdlctx.ptt = 0; 463 s->hdlctx.slotcnt = s->ch_params.slottime; 464 s->hdlctx.calibrate = 0; 465 466 i = s->ops->open(dev); 467 if (i) 468 return i; 469 netif_start_queue(dev); 470 return 0; 471} 472 473/* --------------------------------------------------------------------- */ 474/* 475 * The inverse routine to hdlcdrv_open(). 476 */ 477 478static int hdlcdrv_close(struct net_device *dev) 479{ 480 struct hdlcdrv_state *s = netdev_priv(dev); 481 int i = 0; 482 483 netif_stop_queue(dev); 484 485 if (s->ops && s->ops->close) 486 i = s->ops->close(dev); 487 if (s->skb) 488 dev_kfree_skb(s->skb); 489 s->skb = NULL; 490 s->opened = 0; 491 return i; 492} 493 494/* --------------------------------------------------------------------- */ 495 496static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 497{ 498 struct hdlcdrv_state *s = netdev_priv(dev); 499 struct hdlcdrv_ioctl bi; 500 501 if (cmd != SIOCDEVPRIVATE) { 502 if (s->ops && s->ops->ioctl) 503 return s->ops->ioctl(dev, ifr, &bi, cmd); 504 return -ENOIOCTLCMD; 505 } 506 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) 507 return -EFAULT; 508 509 switch (bi.cmd) { 510 default: 511 if (s->ops && s->ops->ioctl) 512 return s->ops->ioctl(dev, ifr, &bi, cmd); 513 return -ENOIOCTLCMD; 514 515 case HDLCDRVCTL_GETCHANNELPAR: 516 bi.data.cp.tx_delay = s->ch_params.tx_delay; 517 bi.data.cp.tx_tail = s->ch_params.tx_tail; 518 bi.data.cp.slottime = s->ch_params.slottime; 519 bi.data.cp.ppersist = s->ch_params.ppersist; 520 bi.data.cp.fulldup = s->ch_params.fulldup; 521 break; 522 523 case HDLCDRVCTL_SETCHANNELPAR: 524 if (!capable(CAP_NET_ADMIN)) 525 return -EACCES; 526 s->ch_params.tx_delay = bi.data.cp.tx_delay; 527 s->ch_params.tx_tail = bi.data.cp.tx_tail; 528 s->ch_params.slottime = bi.data.cp.slottime; 529 s->ch_params.ppersist = bi.data.cp.ppersist; 530 s->ch_params.fulldup = bi.data.cp.fulldup; 531 s->hdlctx.slotcnt = 1; 532 return 0; 533 534 case HDLCDRVCTL_GETMODEMPAR: 535 bi.data.mp.iobase = dev->base_addr; 536 bi.data.mp.irq = dev->irq; 537 bi.data.mp.dma = dev->dma; 538 bi.data.mp.dma2 = s->ptt_out.dma2; 539 bi.data.mp.seriobase = s->ptt_out.seriobase; 540 bi.data.mp.pariobase = s->ptt_out.pariobase; 541 bi.data.mp.midiiobase = s->ptt_out.midiiobase; 542 break; 543 544 case HDLCDRVCTL_SETMODEMPAR: 545 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) 546 return -EACCES; 547 dev->base_addr = bi.data.mp.iobase; 548 dev->irq = bi.data.mp.irq; 549 dev->dma = bi.data.mp.dma; 550 s->ptt_out.dma2 = bi.data.mp.dma2; 551 s->ptt_out.seriobase = bi.data.mp.seriobase; 552 s->ptt_out.pariobase = bi.data.mp.pariobase; 553 s->ptt_out.midiiobase = bi.data.mp.midiiobase; 554 return 0; 555 556 case HDLCDRVCTL_GETSTAT: 557 bi.data.cs.ptt = hdlcdrv_ptt(s); 558 bi.data.cs.dcd = s->hdlcrx.dcd; 559 bi.data.cs.ptt_keyed = s->ptt_keyed; 560 bi.data.cs.tx_packets = s->stats.tx_packets; 561 bi.data.cs.tx_errors = s->stats.tx_errors; 562 bi.data.cs.rx_packets = s->stats.rx_packets; 563 bi.data.cs.rx_errors = s->stats.rx_errors; 564 break; 565 566 case HDLCDRVCTL_OLDGETSTAT: 567 bi.data.ocs.ptt = hdlcdrv_ptt(s); 568 bi.data.ocs.dcd = s->hdlcrx.dcd; 569 bi.data.ocs.ptt_keyed = s->ptt_keyed; 570 break; 571 572 case HDLCDRVCTL_CALIBRATE: 573 if(!capable(CAP_SYS_RAWIO)) 574 return -EPERM; 575 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; 576 return 0; 577 578 case HDLCDRVCTL_GETSAMPLES: 579#ifndef HDLCDRV_DEBUG 580 return -EPERM; 581#else /* HDLCDRV_DEBUG */ 582 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 583 return -EAGAIN; 584 bi.data.bits = 585 s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; 586 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % 587 sizeof(s->bitbuf_channel.buffer); 588 break; 589#endif /* HDLCDRV_DEBUG */ 590 591 case HDLCDRVCTL_GETBITS: 592#ifndef HDLCDRV_DEBUG 593 return -EPERM; 594#else /* HDLCDRV_DEBUG */ 595 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 596 return -EAGAIN; 597 bi.data.bits = 598 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; 599 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % 600 sizeof(s->bitbuf_hdlc.buffer); 601 break; 602#endif /* HDLCDRV_DEBUG */ 603 604 case HDLCDRVCTL_DRIVERNAME: 605 if (s->ops && s->ops->drvname) { 606 strncpy(bi.data.drivername, s->ops->drvname, 607 sizeof(bi.data.drivername)); 608 break; 609 } 610 bi.data.drivername[0] = '\0'; 611 break; 612 613 } 614 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) 615 return -EFAULT; 616 return 0; 617 618} 619 620/* --------------------------------------------------------------------- */ 621 622/* 623 * Initialize fields in hdlcdrv 624 */ 625static void hdlcdrv_setup(struct net_device *dev) 626{ 627 static const struct hdlcdrv_channel_params dflt_ch_params = { 628 20, 2, 10, 40, 0 629 }; 630 struct hdlcdrv_state *s = netdev_priv(dev); 631 632 /* 633 * initialize the hdlcdrv_state struct 634 */ 635 s->ch_params = dflt_ch_params; 636 s->ptt_keyed = 0; 637 638 spin_lock_init(&s->hdlcrx.hbuf.lock); 639 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 640 s->hdlcrx.in_hdlc_rx = 0; 641 s->hdlcrx.rx_state = 0; 642 643 spin_lock_init(&s->hdlctx.hbuf.lock); 644 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 645 s->hdlctx.in_hdlc_tx = 0; 646 s->hdlctx.tx_state = 1; 647 s->hdlctx.numflags = 0; 648 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 649 s->hdlctx.ptt = 0; 650 s->hdlctx.slotcnt = s->ch_params.slottime; 651 s->hdlctx.calibrate = 0; 652 653#ifdef HDLCDRV_DEBUG 654 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; 655 s->bitbuf_channel.shreg = 0x80; 656 657 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; 658 s->bitbuf_hdlc.shreg = 0x80; 659#endif /* HDLCDRV_DEBUG */ 660 661 /* 662 * initialize the device struct 663 */ 664 dev->open = hdlcdrv_open; 665 dev->stop = hdlcdrv_close; 666 dev->do_ioctl = hdlcdrv_ioctl; 667 dev->hard_start_xmit = hdlcdrv_send_packet; 668 dev->get_stats = hdlcdrv_get_stats; 669 670 /* Fill in the fields of the device structure */ 671 672 s->skb = NULL; 673 674 dev->hard_header = ax25_hard_header; 675 dev->rebuild_header = ax25_rebuild_header; 676 dev->set_mac_address = hdlcdrv_set_mac_address; 677 678 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 679 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 680 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 681 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 682 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 683 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); 684 dev->tx_queue_len = 16; 685} 686 687/* --------------------------------------------------------------------- */ 688struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 689 unsigned int privsize, const char *ifname, 690 unsigned int baseaddr, unsigned int irq, 691 unsigned int dma) 692{ 693 struct net_device *dev; 694 struct hdlcdrv_state *s; 695 int err; 696 697 BUG_ON(ops == NULL); 698 699 if (privsize < sizeof(struct hdlcdrv_state)) 700 privsize = sizeof(struct hdlcdrv_state); 701 702 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup); 703 if (!dev) 704 return ERR_PTR(-ENOMEM); 705 706 /* 707 * initialize part of the hdlcdrv_state struct 708 */ 709 s = netdev_priv(dev); 710 s->magic = HDLCDRV_MAGIC; 711 s->ops = ops; 712 dev->base_addr = baseaddr; 713 dev->irq = irq; 714 dev->dma = dma; 715 716 err = register_netdev(dev); 717 if (err < 0) { 718 printk(KERN_WARNING "hdlcdrv: cannot register net " 719 "device %s\n", dev->name); 720 free_netdev(dev); 721 dev = ERR_PTR(err); 722 } 723 return dev; 724} 725 726/* --------------------------------------------------------------------- */ 727 728void hdlcdrv_unregister(struct net_device *dev) 729{ 730 struct hdlcdrv_state *s = netdev_priv(dev); 731 732 BUG_ON(s->magic != HDLCDRV_MAGIC); 733 734 if (s->opened && s->ops->close) 735 s->ops->close(dev); 736 unregister_netdev(dev); 737 738 free_netdev(dev); 739} 740 741/* --------------------------------------------------------------------- */ 742 743EXPORT_SYMBOL(hdlcdrv_receiver); 744EXPORT_SYMBOL(hdlcdrv_transmitter); 745EXPORT_SYMBOL(hdlcdrv_arbitrate); 746EXPORT_SYMBOL(hdlcdrv_register); 747EXPORT_SYMBOL(hdlcdrv_unregister); 748 749/* --------------------------------------------------------------------- */ 750 751static int __init hdlcdrv_init_driver(void) 752{ 753 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 754 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n"); 755 return 0; 756} 757 758/* --------------------------------------------------------------------- */ 759 760static void __exit hdlcdrv_cleanup_driver(void) 761{ 762 printk(KERN_INFO "hdlcdrv: cleanup\n"); 763} 764 765/* --------------------------------------------------------------------- */ 766 767MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 768MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 769MODULE_LICENSE("GPL"); 770module_init(hdlcdrv_init_driver); 771module_exit(hdlcdrv_cleanup_driver); 772 773/* --------------------------------------------------------------------- */ 774