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/capability.h> 46#include <linux/module.h> 47#include <linux/types.h> 48#include <linux/net.h> 49#include <linux/in.h> 50#include <linux/if.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 += len; 92 *buffer++ = crc; 93 *buffer++ = crc >> 8; 94} 95 96/*---------------------------------------------------------------------------*/ 97 98static inline int check_crc_ccitt(const unsigned char *buf, int cnt) 99{ 100 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; 101} 102 103/*---------------------------------------------------------------------------*/ 104 105#if 0 106static int calc_crc_ccitt(const unsigned char *buf, int cnt) 107{ 108 unsigned int crc = 0xffff; 109 110 for (; cnt > 0; cnt--) 111 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; 112 crc ^= 0xffff; 113 return crc & 0xffff; 114} 115#endif 116 117/* ---------------------------------------------------------------------- */ 118 119#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) 120 121/* ---------------------------------------------------------------------- */ 122/* 123 * The HDLC routines 124 */ 125 126static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, 127 int num) 128{ 129 int added = 0; 130 131 while (s->hdlcrx.rx_state && num >= 8) { 132 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { 133 s->hdlcrx.rx_state = 0; 134 return 0; 135 } 136 *s->hdlcrx.bp++ = bits >> (32-num); 137 s->hdlcrx.len++; 138 num -= 8; 139 added += 8; 140 } 141 return added; 142} 143 144static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) 145{ 146 struct sk_buff *skb; 147 int pkt_len; 148 unsigned char *cp; 149 150 if (s->hdlcrx.len < 4) 151 return; 152 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) 153 return; 154 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ 155 if (!(skb = dev_alloc_skb(pkt_len))) { 156 printk("%s: memory squeeze, dropping packet\n", dev->name); 157 dev->stats.rx_dropped++; 158 return; 159 } 160 cp = skb_put(skb, pkt_len); 161 *cp++ = 0; /* KISS kludge */ 162 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); 163 skb->protocol = ax25_type_trans(skb, dev); 164 netif_rx(skb); 165 dev->stats.rx_packets++; 166} 167 168void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) 169{ 170 int i; 171 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; 172 173 if (!s || s->magic != HDLCDRV_MAGIC) 174 return; 175 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) 176 return; 177 178 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { 179 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); 180 181#ifdef HDLCDRV_DEBUG 182 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); 183#endif /* HDLCDRV_DEBUG */ 184 s->hdlcrx.bitstream >>= 16; 185 s->hdlcrx.bitstream |= word << 16; 186 s->hdlcrx.bitbuf >>= 16; 187 s->hdlcrx.bitbuf |= word << 16; 188 s->hdlcrx.numbits += 16; 189 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, 190 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 191 i >= 0; 192 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 193 mask5 <<= 1, mask6 = (mask6 << 1) | 1) { 194 if ((s->hdlcrx.bitstream & mask1) == mask1) 195 s->hdlcrx.rx_state = 0; /* abort received */ 196 else if ((s->hdlcrx.bitstream & mask2) == mask3) { 197 /* flag received */ 198 if (s->hdlcrx.rx_state) { 199 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 200 << (8+i), 201 s->hdlcrx.numbits 202 -8-i); 203 hdlc_rx_flag(dev, s); 204 } 205 s->hdlcrx.len = 0; 206 s->hdlcrx.bp = s->hdlcrx.buffer; 207 s->hdlcrx.rx_state = 1; 208 s->hdlcrx.numbits = i; 209 } else if ((s->hdlcrx.bitstream & mask4) == mask5) { 210 /* stuffed bit */ 211 s->hdlcrx.numbits--; 212 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | 213 ((s->hdlcrx.bitbuf & mask6) << 1); 214 } 215 } 216 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, 217 s->hdlcrx.numbits); 218 } 219 clear_bit(0, &s->hdlcrx.in_hdlc_rx); 220} 221 222/* ---------------------------------------------------------------------- */ 223 224static inline void do_kiss_params(struct hdlcdrv_state *s, 225 unsigned char *data, unsigned long len) 226{ 227 228#ifdef KISS_VERBOSE 229#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) 230#else /* KISS_VERBOSE */ 231#define PKP(a,b) 232#endif /* KISS_VERBOSE */ 233 234 if (len < 2) 235 return; 236 switch(data[0]) { 237 case PARAM_TXDELAY: 238 s->ch_params.tx_delay = data[1]; 239 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); 240 break; 241 case PARAM_PERSIST: 242 s->ch_params.ppersist = data[1]; 243 PKP("p persistence = %u", s->ch_params.ppersist); 244 break; 245 case PARAM_SLOTTIME: 246 s->ch_params.slottime = data[1]; 247 PKP("slot time = %ums", s->ch_params.slottime); 248 break; 249 case PARAM_TXTAIL: 250 s->ch_params.tx_tail = data[1]; 251 PKP("TX tail = %ums", s->ch_params.tx_tail); 252 break; 253 case PARAM_FULLDUP: 254 s->ch_params.fulldup = !!data[1]; 255 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); 256 break; 257 default: 258 break; 259 } 260#undef PKP 261} 262 263/* ---------------------------------------------------------------------- */ 264 265void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) 266{ 267 unsigned int mask1, mask2, mask3; 268 int i; 269 struct sk_buff *skb; 270 int pkt_len; 271 272 if (!s || s->magic != HDLCDRV_MAGIC) 273 return; 274 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) 275 return; 276 for (;;) { 277 if (s->hdlctx.numbits >= 16) { 278 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { 279 clear_bit(0, &s->hdlctx.in_hdlc_tx); 280 return; 281 } 282 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); 283 s->hdlctx.bitbuf >>= 16; 284 s->hdlctx.numbits -= 16; 285 } 286 switch (s->hdlctx.tx_state) { 287 default: 288 clear_bit(0, &s->hdlctx.in_hdlc_tx); 289 return; 290 case 0: 291 case 1: 292 if (s->hdlctx.numflags) { 293 s->hdlctx.numflags--; 294 s->hdlctx.bitbuf |= 295 0x7e7e << s->hdlctx.numbits; 296 s->hdlctx.numbits += 16; 297 break; 298 } 299 if (s->hdlctx.tx_state == 1) { 300 clear_bit(0, &s->hdlctx.in_hdlc_tx); 301 return; 302 } 303 if (!(skb = s->skb)) { 304 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); 305 if (flgs < 2) 306 flgs = 2; 307 s->hdlctx.tx_state = 1; 308 s->hdlctx.numflags = flgs; 309 break; 310 } 311 s->skb = NULL; 312 netif_wake_queue(dev); 313 pkt_len = skb->len-1; /* strip KISS byte */ 314 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { 315 s->hdlctx.tx_state = 0; 316 s->hdlctx.numflags = 1; 317 dev_kfree_skb_irq(skb); 318 break; 319 } 320 skb_copy_from_linear_data_offset(skb, 1, 321 s->hdlctx.buffer, 322 pkt_len); 323 dev_kfree_skb_irq(skb); 324 s->hdlctx.bp = s->hdlctx.buffer; 325 append_crc_ccitt(s->hdlctx.buffer, pkt_len); 326 s->hdlctx.len = pkt_len+2; /* the appended CRC */ 327 s->hdlctx.tx_state = 2; 328 s->hdlctx.bitstream = 0; 329 dev->stats.tx_packets++; 330 break; 331 case 2: 332 if (!s->hdlctx.len) { 333 s->hdlctx.tx_state = 0; 334 s->hdlctx.numflags = 1; 335 break; 336 } 337 s->hdlctx.len--; 338 s->hdlctx.bitbuf |= *s->hdlctx.bp << 339 s->hdlctx.numbits; 340 s->hdlctx.bitstream >>= 8; 341 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; 342 mask1 = 0x1f000; 343 mask2 = 0x10000; 344 mask3 = 0xffffffff >> (31-s->hdlctx.numbits); 345 s->hdlctx.numbits += 8; 346 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 347 mask3 = (mask3 << 1) | 1) { 348 if ((s->hdlctx.bitstream & mask1) != mask1) 349 continue; 350 s->hdlctx.bitstream &= ~mask2; 351 s->hdlctx.bitbuf = 352 (s->hdlctx.bitbuf & mask3) | 353 ((s->hdlctx.bitbuf & 354 (~mask3)) << 1); 355 s->hdlctx.numbits++; 356 mask3 = (mask3 << 1) | 1; 357 } 358 break; 359 } 360 } 361} 362 363/* ---------------------------------------------------------------------- */ 364 365static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) 366{ 367 s->hdlctx.tx_state = 0; 368 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); 369 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; 370 hdlcdrv_transmitter(dev, s); 371 s->hdlctx.ptt = 1; 372 s->ptt_keyed++; 373} 374 375/* ---------------------------------------------------------------------- */ 376 377void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) 378{ 379 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 380 return; 381 if (s->ch_params.fulldup) { 382 start_tx(dev, s); 383 return; 384 } 385 if (s->hdlcrx.dcd) { 386 s->hdlctx.slotcnt = s->ch_params.slottime; 387 return; 388 } 389 if ((--s->hdlctx.slotcnt) > 0) 390 return; 391 s->hdlctx.slotcnt = s->ch_params.slottime; 392 if ((prandom_u32() % 256) > s->ch_params.ppersist) 393 return; 394 start_tx(dev, s); 395} 396 397/* --------------------------------------------------------------------- */ 398/* 399 * ===================== network driver interface ========================= 400 */ 401 402static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, 403 struct net_device *dev) 404{ 405 struct hdlcdrv_state *sm = netdev_priv(dev); 406 407 if (skb->protocol == htons(ETH_P_IP)) 408 return ax25_ip_xmit(skb); 409 410 if (skb->data[0] != 0) { 411 do_kiss_params(sm, skb->data, skb->len); 412 dev_kfree_skb(skb); 413 return NETDEV_TX_OK; 414 } 415 if (sm->skb) 416 return NETDEV_TX_LOCKED; 417 netif_stop_queue(dev); 418 sm->skb = skb; 419 return NETDEV_TX_OK; 420} 421 422/* --------------------------------------------------------------------- */ 423 424static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 425{ 426 struct sockaddr *sa = (struct sockaddr *)addr; 427 428 /* addr is an AX.25 shifted ASCII mac address */ 429 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 430 return 0; 431} 432 433/* --------------------------------------------------------------------- */ 434/* 435 * Open/initialize the board. This is called (in the current kernel) 436 * sometime after booting when the 'ifconfig' program is run. 437 * 438 * This routine should set everything up anew at each open, even 439 * registers that "should" only need to be set once at boot, so that 440 * there is non-reboot way to recover if something goes wrong. 441 */ 442 443static int hdlcdrv_open(struct net_device *dev) 444{ 445 struct hdlcdrv_state *s = netdev_priv(dev); 446 int i; 447 448 if (!s->ops || !s->ops->open) 449 return -ENODEV; 450 451 /* 452 * initialise some variables 453 */ 454 s->opened = 1; 455 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 456 s->hdlcrx.in_hdlc_rx = 0; 457 s->hdlcrx.rx_state = 0; 458 459 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 460 s->hdlctx.in_hdlc_tx = 0; 461 s->hdlctx.tx_state = 1; 462 s->hdlctx.numflags = 0; 463 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 464 s->hdlctx.ptt = 0; 465 s->hdlctx.slotcnt = s->ch_params.slottime; 466 s->hdlctx.calibrate = 0; 467 468 i = s->ops->open(dev); 469 if (i) 470 return i; 471 netif_start_queue(dev); 472 return 0; 473} 474 475/* --------------------------------------------------------------------- */ 476/* 477 * The inverse routine to hdlcdrv_open(). 478 */ 479 480static int hdlcdrv_close(struct net_device *dev) 481{ 482 struct hdlcdrv_state *s = netdev_priv(dev); 483 int i = 0; 484 485 netif_stop_queue(dev); 486 487 if (s->ops && s->ops->close) 488 i = s->ops->close(dev); 489 if (s->skb) 490 dev_kfree_skb(s->skb); 491 s->skb = NULL; 492 s->opened = 0; 493 return i; 494} 495 496/* --------------------------------------------------------------------- */ 497 498static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 499{ 500 struct hdlcdrv_state *s = netdev_priv(dev); 501 struct hdlcdrv_ioctl bi; 502 503 if (cmd != SIOCDEVPRIVATE) { 504 if (s->ops && s->ops->ioctl) 505 return s->ops->ioctl(dev, ifr, &bi, cmd); 506 return -ENOIOCTLCMD; 507 } 508 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) 509 return -EFAULT; 510 511 switch (bi.cmd) { 512 default: 513 if (s->ops && s->ops->ioctl) 514 return s->ops->ioctl(dev, ifr, &bi, cmd); 515 return -ENOIOCTLCMD; 516 517 case HDLCDRVCTL_GETCHANNELPAR: 518 bi.data.cp.tx_delay = s->ch_params.tx_delay; 519 bi.data.cp.tx_tail = s->ch_params.tx_tail; 520 bi.data.cp.slottime = s->ch_params.slottime; 521 bi.data.cp.ppersist = s->ch_params.ppersist; 522 bi.data.cp.fulldup = s->ch_params.fulldup; 523 break; 524 525 case HDLCDRVCTL_SETCHANNELPAR: 526 if (!capable(CAP_NET_ADMIN)) 527 return -EACCES; 528 s->ch_params.tx_delay = bi.data.cp.tx_delay; 529 s->ch_params.tx_tail = bi.data.cp.tx_tail; 530 s->ch_params.slottime = bi.data.cp.slottime; 531 s->ch_params.ppersist = bi.data.cp.ppersist; 532 s->ch_params.fulldup = bi.data.cp.fulldup; 533 s->hdlctx.slotcnt = 1; 534 return 0; 535 536 case HDLCDRVCTL_GETMODEMPAR: 537 bi.data.mp.iobase = dev->base_addr; 538 bi.data.mp.irq = dev->irq; 539 bi.data.mp.dma = dev->dma; 540 bi.data.mp.dma2 = s->ptt_out.dma2; 541 bi.data.mp.seriobase = s->ptt_out.seriobase; 542 bi.data.mp.pariobase = s->ptt_out.pariobase; 543 bi.data.mp.midiiobase = s->ptt_out.midiiobase; 544 break; 545 546 case HDLCDRVCTL_SETMODEMPAR: 547 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) 548 return -EACCES; 549 dev->base_addr = bi.data.mp.iobase; 550 dev->irq = bi.data.mp.irq; 551 dev->dma = bi.data.mp.dma; 552 s->ptt_out.dma2 = bi.data.mp.dma2; 553 s->ptt_out.seriobase = bi.data.mp.seriobase; 554 s->ptt_out.pariobase = bi.data.mp.pariobase; 555 s->ptt_out.midiiobase = bi.data.mp.midiiobase; 556 return 0; 557 558 case HDLCDRVCTL_GETSTAT: 559 bi.data.cs.ptt = hdlcdrv_ptt(s); 560 bi.data.cs.dcd = s->hdlcrx.dcd; 561 bi.data.cs.ptt_keyed = s->ptt_keyed; 562 bi.data.cs.tx_packets = dev->stats.tx_packets; 563 bi.data.cs.tx_errors = dev->stats.tx_errors; 564 bi.data.cs.rx_packets = dev->stats.rx_packets; 565 bi.data.cs.rx_errors = dev->stats.rx_errors; 566 break; 567 568 case HDLCDRVCTL_OLDGETSTAT: 569 bi.data.ocs.ptt = hdlcdrv_ptt(s); 570 bi.data.ocs.dcd = s->hdlcrx.dcd; 571 bi.data.ocs.ptt_keyed = s->ptt_keyed; 572 break; 573 574 case HDLCDRVCTL_CALIBRATE: 575 if(!capable(CAP_SYS_RAWIO)) 576 return -EPERM; 577 if (bi.data.calibrate > INT_MAX / s->par.bitrate) 578 return -EINVAL; 579 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; 580 return 0; 581 582 case HDLCDRVCTL_GETSAMPLES: 583#ifndef HDLCDRV_DEBUG 584 return -EPERM; 585#else /* HDLCDRV_DEBUG */ 586 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 587 return -EAGAIN; 588 bi.data.bits = 589 s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; 590 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % 591 sizeof(s->bitbuf_channel.buffer); 592 break; 593#endif /* HDLCDRV_DEBUG */ 594 595 case HDLCDRVCTL_GETBITS: 596#ifndef HDLCDRV_DEBUG 597 return -EPERM; 598#else /* HDLCDRV_DEBUG */ 599 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 600 return -EAGAIN; 601 bi.data.bits = 602 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; 603 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % 604 sizeof(s->bitbuf_hdlc.buffer); 605 break; 606#endif /* HDLCDRV_DEBUG */ 607 608 case HDLCDRVCTL_DRIVERNAME: 609 if (s->ops && s->ops->drvname) { 610 strncpy(bi.data.drivername, s->ops->drvname, 611 sizeof(bi.data.drivername)); 612 break; 613 } 614 bi.data.drivername[0] = '\0'; 615 break; 616 617 } 618 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) 619 return -EFAULT; 620 return 0; 621 622} 623 624/* --------------------------------------------------------------------- */ 625 626static const struct net_device_ops hdlcdrv_netdev = { 627 .ndo_open = hdlcdrv_open, 628 .ndo_stop = hdlcdrv_close, 629 .ndo_start_xmit = hdlcdrv_send_packet, 630 .ndo_do_ioctl = hdlcdrv_ioctl, 631 .ndo_set_mac_address = hdlcdrv_set_mac_address, 632}; 633 634/* 635 * Initialize fields in hdlcdrv 636 */ 637static void hdlcdrv_setup(struct net_device *dev) 638{ 639 static const struct hdlcdrv_channel_params dflt_ch_params = { 640 20, 2, 10, 40, 0 641 }; 642 struct hdlcdrv_state *s = netdev_priv(dev); 643 644 /* 645 * initialize the hdlcdrv_state struct 646 */ 647 s->ch_params = dflt_ch_params; 648 s->ptt_keyed = 0; 649 650 spin_lock_init(&s->hdlcrx.hbuf.lock); 651 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 652 s->hdlcrx.in_hdlc_rx = 0; 653 s->hdlcrx.rx_state = 0; 654 655 spin_lock_init(&s->hdlctx.hbuf.lock); 656 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 657 s->hdlctx.in_hdlc_tx = 0; 658 s->hdlctx.tx_state = 1; 659 s->hdlctx.numflags = 0; 660 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 661 s->hdlctx.ptt = 0; 662 s->hdlctx.slotcnt = s->ch_params.slottime; 663 s->hdlctx.calibrate = 0; 664 665#ifdef HDLCDRV_DEBUG 666 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; 667 s->bitbuf_channel.shreg = 0x80; 668 669 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; 670 s->bitbuf_hdlc.shreg = 0x80; 671#endif /* HDLCDRV_DEBUG */ 672 673 674 /* Fill in the fields of the device structure */ 675 676 s->skb = NULL; 677 678 dev->netdev_ops = &hdlcdrv_netdev; 679 dev->header_ops = &ax25_header_ops; 680 681 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 682 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 683 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 684 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 685 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 686 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); 687 dev->tx_queue_len = 16; 688} 689 690/* --------------------------------------------------------------------- */ 691struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 692 unsigned int privsize, const char *ifname, 693 unsigned int baseaddr, unsigned int irq, 694 unsigned int dma) 695{ 696 struct net_device *dev; 697 struct hdlcdrv_state *s; 698 int err; 699 700 BUG_ON(ops == NULL); 701 702 if (privsize < sizeof(struct hdlcdrv_state)) 703 privsize = sizeof(struct hdlcdrv_state); 704 705 dev = alloc_netdev(privsize, ifname, NET_NAME_UNKNOWN, hdlcdrv_setup); 706 if (!dev) 707 return ERR_PTR(-ENOMEM); 708 709 /* 710 * initialize part of the hdlcdrv_state struct 711 */ 712 s = netdev_priv(dev); 713 s->magic = HDLCDRV_MAGIC; 714 s->ops = ops; 715 dev->base_addr = baseaddr; 716 dev->irq = irq; 717 dev->dma = dma; 718 719 err = register_netdev(dev); 720 if (err < 0) { 721 printk(KERN_WARNING "hdlcdrv: cannot register net " 722 "device %s\n", dev->name); 723 free_netdev(dev); 724 dev = ERR_PTR(err); 725 } 726 return dev; 727} 728 729/* --------------------------------------------------------------------- */ 730 731void hdlcdrv_unregister(struct net_device *dev) 732{ 733 struct hdlcdrv_state *s = netdev_priv(dev); 734 735 BUG_ON(s->magic != HDLCDRV_MAGIC); 736 737 if (s->opened && s->ops->close) 738 s->ops->close(dev); 739 unregister_netdev(dev); 740 741 free_netdev(dev); 742} 743 744/* --------------------------------------------------------------------- */ 745 746EXPORT_SYMBOL(hdlcdrv_receiver); 747EXPORT_SYMBOL(hdlcdrv_transmitter); 748EXPORT_SYMBOL(hdlcdrv_arbitrate); 749EXPORT_SYMBOL(hdlcdrv_register); 750EXPORT_SYMBOL(hdlcdrv_unregister); 751 752/* --------------------------------------------------------------------- */ 753 754static int __init hdlcdrv_init_driver(void) 755{ 756 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 757 printk(KERN_INFO "hdlcdrv: version 0.8\n"); 758 return 0; 759} 760 761/* --------------------------------------------------------------------- */ 762 763static void __exit hdlcdrv_cleanup_driver(void) 764{ 765 printk(KERN_INFO "hdlcdrv: cleanup\n"); 766} 767 768/* --------------------------------------------------------------------- */ 769 770MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 771MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 772MODULE_LICENSE("GPL"); 773module_init(hdlcdrv_init_driver); 774module_exit(hdlcdrv_cleanup_driver); 775 776/* --------------------------------------------------------------------- */ 777