1// SPDX-License-Identifier: GPL-2.0-or-later 2/*****************************************************************************/ 3 4/* 5 * hdlcdrv.c -- HDLC packet radio network driver. 6 * 7 * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 8 * 9 * Please note that the GPL allows you to use the driver, NOT the radio. 10 * In order to use the radio, you need a license from the communications 11 * authority of your country. 12 * 13 * The driver was derived from Donald Beckers skeleton.c 14 * Written 1993-94 by Donald Becker. 15 * 16 * History: 17 * 0.1 21.09.1996 Started 18 * 18.10.1996 Changed to new user space access routines 19 * (copy_{to,from}_user) 20 * 0.2 21.11.1996 various small changes 21 * 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module 22 * 0.4 16.04.1997 init code/data tagged 23 * 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the 24 * soundmodem driver) 25 * 0.6 05.04.1998 add spinlocks 26 * 0.7 03.08.1999 removed some old compatibility cruft 27 * 0.8 12.02.2000 adapted to softnet driver interface 28 */ 29 30/*****************************************************************************/ 31 32#include <linux/capability.h> 33#include <linux/compat.h> 34#include <linux/module.h> 35#include <linux/types.h> 36#include <linux/net.h> 37#include <linux/in.h> 38#include <linux/if.h> 39#include <linux/errno.h> 40#include <linux/init.h> 41#include <linux/bitops.h> 42 43#include <linux/netdevice.h> 44#include <linux/if_arp.h> 45#include <linux/skbuff.h> 46#include <linux/hdlcdrv.h> 47#include <linux/random.h> 48#include <net/ax25.h> 49#include <linux/uaccess.h> 50 51#include <linux/crc-ccitt.h> 52 53/* --------------------------------------------------------------------- */ 54 55#define KISS_VERBOSE 56 57/* --------------------------------------------------------------------- */ 58 59#define PARAM_TXDELAY 1 60#define PARAM_PERSIST 2 61#define PARAM_SLOTTIME 3 62#define PARAM_TXTAIL 4 63#define PARAM_FULLDUP 5 64#define PARAM_HARDWARE 6 65#define PARAM_RETURN 255 66 67/* --------------------------------------------------------------------- */ 68/* 69 * the CRC routines are stolen from WAMPES 70 * by Dieter Deyke 71 */ 72 73 74/*---------------------------------------------------------------------------*/ 75 76static inline void append_crc_ccitt(unsigned char *buffer, int len) 77{ 78 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; 79 buffer += len; 80 *buffer++ = crc; 81 *buffer++ = crc >> 8; 82} 83 84/*---------------------------------------------------------------------------*/ 85 86static inline int check_crc_ccitt(const unsigned char *buf, int cnt) 87{ 88 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; 89} 90 91/*---------------------------------------------------------------------------*/ 92 93#if 0 94static int calc_crc_ccitt(const unsigned char *buf, int cnt) 95{ 96 unsigned int crc = 0xffff; 97 98 for (; cnt > 0; cnt--) 99 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; 100 crc ^= 0xffff; 101 return crc & 0xffff; 102} 103#endif 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 dev->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->stats.rx_packets++; 154} 155 156void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) 157{ 158 int i; 159 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; 160 161 if (!s || s->magic != HDLCDRV_MAGIC) 162 return; 163 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) 164 return; 165 166 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { 167 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); 168 169#ifdef HDLCDRV_DEBUG 170 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); 171#endif /* HDLCDRV_DEBUG */ 172 s->hdlcrx.bitstream >>= 16; 173 s->hdlcrx.bitstream |= word << 16; 174 s->hdlcrx.bitbuf >>= 16; 175 s->hdlcrx.bitbuf |= word << 16; 176 s->hdlcrx.numbits += 16; 177 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, 178 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 179 i >= 0; 180 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 181 mask5 <<= 1, mask6 = (mask6 << 1) | 1) { 182 if ((s->hdlcrx.bitstream & mask1) == mask1) 183 s->hdlcrx.rx_state = 0; /* abort received */ 184 else if ((s->hdlcrx.bitstream & mask2) == mask3) { 185 /* flag received */ 186 if (s->hdlcrx.rx_state) { 187 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 188 << (8+i), 189 s->hdlcrx.numbits 190 -8-i); 191 hdlc_rx_flag(dev, s); 192 } 193 s->hdlcrx.len = 0; 194 s->hdlcrx.bp = s->hdlcrx.buffer; 195 s->hdlcrx.rx_state = 1; 196 s->hdlcrx.numbits = i; 197 } else if ((s->hdlcrx.bitstream & mask4) == mask5) { 198 /* stuffed bit */ 199 s->hdlcrx.numbits--; 200 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | 201 ((s->hdlcrx.bitbuf & mask6) << 1); 202 } 203 } 204 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, 205 s->hdlcrx.numbits); 206 } 207 clear_bit(0, &s->hdlcrx.in_hdlc_rx); 208} 209 210/* ---------------------------------------------------------------------- */ 211 212static inline void do_kiss_params(struct hdlcdrv_state *s, 213 unsigned char *data, unsigned long len) 214{ 215 216#ifdef KISS_VERBOSE 217#define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) 218#else /* KISS_VERBOSE */ 219#define PKP(a,b) 220#endif /* KISS_VERBOSE */ 221 222 if (len < 2) 223 return; 224 switch(data[0]) { 225 case PARAM_TXDELAY: 226 s->ch_params.tx_delay = data[1]; 227 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); 228 break; 229 case PARAM_PERSIST: 230 s->ch_params.ppersist = data[1]; 231 PKP("p persistence = %u", s->ch_params.ppersist); 232 break; 233 case PARAM_SLOTTIME: 234 s->ch_params.slottime = data[1]; 235 PKP("slot time = %ums", s->ch_params.slottime); 236 break; 237 case PARAM_TXTAIL: 238 s->ch_params.tx_tail = data[1]; 239 PKP("TX tail = %ums", s->ch_params.tx_tail); 240 break; 241 case PARAM_FULLDUP: 242 s->ch_params.fulldup = !!data[1]; 243 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); 244 break; 245 default: 246 break; 247 } 248#undef PKP 249} 250 251/* ---------------------------------------------------------------------- */ 252 253void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) 254{ 255 unsigned int mask1, mask2, mask3; 256 int i; 257 struct sk_buff *skb; 258 int pkt_len; 259 260 if (!s || s->magic != HDLCDRV_MAGIC) 261 return; 262 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) 263 return; 264 for (;;) { 265 if (s->hdlctx.numbits >= 16) { 266 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { 267 clear_bit(0, &s->hdlctx.in_hdlc_tx); 268 return; 269 } 270 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); 271 s->hdlctx.bitbuf >>= 16; 272 s->hdlctx.numbits -= 16; 273 } 274 switch (s->hdlctx.tx_state) { 275 default: 276 clear_bit(0, &s->hdlctx.in_hdlc_tx); 277 return; 278 case 0: 279 case 1: 280 if (s->hdlctx.numflags) { 281 s->hdlctx.numflags--; 282 s->hdlctx.bitbuf |= 283 0x7e7e << s->hdlctx.numbits; 284 s->hdlctx.numbits += 16; 285 break; 286 } 287 if (s->hdlctx.tx_state == 1) { 288 clear_bit(0, &s->hdlctx.in_hdlc_tx); 289 return; 290 } 291 if (!(skb = s->skb)) { 292 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); 293 if (flgs < 2) 294 flgs = 2; 295 s->hdlctx.tx_state = 1; 296 s->hdlctx.numflags = flgs; 297 break; 298 } 299 s->skb = NULL; 300 netif_wake_queue(dev); 301 pkt_len = skb->len-1; /* strip KISS byte */ 302 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { 303 s->hdlctx.tx_state = 0; 304 s->hdlctx.numflags = 1; 305 dev_kfree_skb_irq(skb); 306 break; 307 } 308 skb_copy_from_linear_data_offset(skb, 1, 309 s->hdlctx.buffer, 310 pkt_len); 311 dev_kfree_skb_irq(skb); 312 s->hdlctx.bp = s->hdlctx.buffer; 313 append_crc_ccitt(s->hdlctx.buffer, pkt_len); 314 s->hdlctx.len = pkt_len+2; /* the appended CRC */ 315 s->hdlctx.tx_state = 2; 316 s->hdlctx.bitstream = 0; 317 dev->stats.tx_packets++; 318 break; 319 case 2: 320 if (!s->hdlctx.len) { 321 s->hdlctx.tx_state = 0; 322 s->hdlctx.numflags = 1; 323 break; 324 } 325 s->hdlctx.len--; 326 s->hdlctx.bitbuf |= *s->hdlctx.bp << 327 s->hdlctx.numbits; 328 s->hdlctx.bitstream >>= 8; 329 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; 330 mask1 = 0x1f000; 331 mask2 = 0x10000; 332 mask3 = 0xffffffff >> (31-s->hdlctx.numbits); 333 s->hdlctx.numbits += 8; 334 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 335 mask3 = (mask3 << 1) | 1) { 336 if ((s->hdlctx.bitstream & mask1) != mask1) 337 continue; 338 s->hdlctx.bitstream &= ~mask2; 339 s->hdlctx.bitbuf = 340 (s->hdlctx.bitbuf & mask3) | 341 ((s->hdlctx.bitbuf & 342 (~mask3)) << 1); 343 s->hdlctx.numbits++; 344 mask3 = (mask3 << 1) | 1; 345 } 346 break; 347 } 348 } 349} 350 351/* ---------------------------------------------------------------------- */ 352 353static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) 354{ 355 s->hdlctx.tx_state = 0; 356 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); 357 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; 358 hdlcdrv_transmitter(dev, s); 359 s->hdlctx.ptt = 1; 360 s->ptt_keyed++; 361} 362 363/* ---------------------------------------------------------------------- */ 364 365void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) 366{ 367 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 368 return; 369 if (s->ch_params.fulldup) { 370 start_tx(dev, s); 371 return; 372 } 373 if (s->hdlcrx.dcd) { 374 s->hdlctx.slotcnt = s->ch_params.slottime; 375 return; 376 } 377 if ((--s->hdlctx.slotcnt) > 0) 378 return; 379 s->hdlctx.slotcnt = s->ch_params.slottime; 380 if (get_random_u8() > s->ch_params.ppersist) 381 return; 382 start_tx(dev, s); 383} 384 385/* --------------------------------------------------------------------- */ 386/* 387 * ===================== network driver interface ========================= 388 */ 389 390static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, 391 struct net_device *dev) 392{ 393 struct hdlcdrv_state *sm = netdev_priv(dev); 394 395 if (skb->protocol == htons(ETH_P_IP)) 396 return ax25_ip_xmit(skb); 397 398 if (skb->data[0] != 0) { 399 do_kiss_params(sm, skb->data, skb->len); 400 dev_kfree_skb(skb); 401 return NETDEV_TX_OK; 402 } 403 if (sm->skb) { 404 dev_kfree_skb(skb); 405 return NETDEV_TX_OK; 406 } 407 netif_stop_queue(dev); 408 sm->skb = skb; 409 return NETDEV_TX_OK; 410} 411 412/* --------------------------------------------------------------------- */ 413 414static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 415{ 416 struct sockaddr *sa = (struct sockaddr *)addr; 417 418 /* addr is an AX.25 shifted ASCII mac address */ 419 dev_addr_set(dev, sa->sa_data); 420 return 0; 421} 422 423/* --------------------------------------------------------------------- */ 424/* 425 * Open/initialize the board. This is called (in the current kernel) 426 * sometime after booting when the 'ifconfig' program is run. 427 * 428 * This routine should set everything up anew at each open, even 429 * registers that "should" only need to be set once at boot, so that 430 * there is non-reboot way to recover if something goes wrong. 431 */ 432 433static int hdlcdrv_open(struct net_device *dev) 434{ 435 struct hdlcdrv_state *s = netdev_priv(dev); 436 int i; 437 438 if (!s->ops || !s->ops->open) 439 return -ENODEV; 440 441 /* 442 * initialise some variables 443 */ 444 s->opened = 1; 445 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 446 s->hdlcrx.in_hdlc_rx = 0; 447 s->hdlcrx.rx_state = 0; 448 449 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 450 s->hdlctx.in_hdlc_tx = 0; 451 s->hdlctx.tx_state = 1; 452 s->hdlctx.numflags = 0; 453 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 454 s->hdlctx.ptt = 0; 455 s->hdlctx.slotcnt = s->ch_params.slottime; 456 s->hdlctx.calibrate = 0; 457 458 i = s->ops->open(dev); 459 if (i) 460 return i; 461 netif_start_queue(dev); 462 return 0; 463} 464 465/* --------------------------------------------------------------------- */ 466/* 467 * The inverse routine to hdlcdrv_open(). 468 */ 469 470static int hdlcdrv_close(struct net_device *dev) 471{ 472 struct hdlcdrv_state *s = netdev_priv(dev); 473 int i = 0; 474 475 netif_stop_queue(dev); 476 477 if (s->ops && s->ops->close) 478 i = s->ops->close(dev); 479 dev_kfree_skb(s->skb); 480 s->skb = NULL; 481 s->opened = 0; 482 return i; 483} 484 485/* --------------------------------------------------------------------- */ 486 487static int hdlcdrv_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 488 void __user *data, int cmd) 489{ 490 struct hdlcdrv_state *s = netdev_priv(dev); 491 struct hdlcdrv_ioctl bi; 492 493 if (cmd != SIOCDEVPRIVATE) 494 return -ENOIOCTLCMD; 495 496 if (in_compat_syscall()) /* to be implemented */ 497 return -ENOIOCTLCMD; 498 499 if (copy_from_user(&bi, data, sizeof(bi))) 500 return -EFAULT; 501 502 switch (bi.cmd) { 503 default: 504 if (s->ops && s->ops->ioctl) 505 return s->ops->ioctl(dev, data, &bi, cmd); 506 return -ENOIOCTLCMD; 507 508 case HDLCDRVCTL_GETCHANNELPAR: 509 bi.data.cp.tx_delay = s->ch_params.tx_delay; 510 bi.data.cp.tx_tail = s->ch_params.tx_tail; 511 bi.data.cp.slottime = s->ch_params.slottime; 512 bi.data.cp.ppersist = s->ch_params.ppersist; 513 bi.data.cp.fulldup = s->ch_params.fulldup; 514 break; 515 516 case HDLCDRVCTL_SETCHANNELPAR: 517 if (!capable(CAP_NET_ADMIN)) 518 return -EACCES; 519 s->ch_params.tx_delay = bi.data.cp.tx_delay; 520 s->ch_params.tx_tail = bi.data.cp.tx_tail; 521 s->ch_params.slottime = bi.data.cp.slottime; 522 s->ch_params.ppersist = bi.data.cp.ppersist; 523 s->ch_params.fulldup = bi.data.cp.fulldup; 524 s->hdlctx.slotcnt = 1; 525 return 0; 526 527 case HDLCDRVCTL_GETMODEMPAR: 528 bi.data.mp.iobase = dev->base_addr; 529 bi.data.mp.irq = dev->irq; 530 bi.data.mp.dma = dev->dma; 531 bi.data.mp.dma2 = s->ptt_out.dma2; 532 bi.data.mp.seriobase = s->ptt_out.seriobase; 533 bi.data.mp.pariobase = s->ptt_out.pariobase; 534 bi.data.mp.midiiobase = s->ptt_out.midiiobase; 535 break; 536 537 case HDLCDRVCTL_SETMODEMPAR: 538 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) 539 return -EACCES; 540 dev->base_addr = bi.data.mp.iobase; 541 dev->irq = bi.data.mp.irq; 542 dev->dma = bi.data.mp.dma; 543 s->ptt_out.dma2 = bi.data.mp.dma2; 544 s->ptt_out.seriobase = bi.data.mp.seriobase; 545 s->ptt_out.pariobase = bi.data.mp.pariobase; 546 s->ptt_out.midiiobase = bi.data.mp.midiiobase; 547 return 0; 548 549 case HDLCDRVCTL_GETSTAT: 550 bi.data.cs.ptt = hdlcdrv_ptt(s); 551 bi.data.cs.dcd = s->hdlcrx.dcd; 552 bi.data.cs.ptt_keyed = s->ptt_keyed; 553 bi.data.cs.tx_packets = dev->stats.tx_packets; 554 bi.data.cs.tx_errors = dev->stats.tx_errors; 555 bi.data.cs.rx_packets = dev->stats.rx_packets; 556 bi.data.cs.rx_errors = dev->stats.rx_errors; 557 break; 558 559 case HDLCDRVCTL_OLDGETSTAT: 560 bi.data.ocs.ptt = hdlcdrv_ptt(s); 561 bi.data.ocs.dcd = s->hdlcrx.dcd; 562 bi.data.ocs.ptt_keyed = s->ptt_keyed; 563 break; 564 565 case HDLCDRVCTL_CALIBRATE: 566 if(!capable(CAP_SYS_RAWIO)) 567 return -EPERM; 568 if (s->par.bitrate <= 0) 569 return -EINVAL; 570 if (bi.data.calibrate > INT_MAX / s->par.bitrate) 571 return -EINVAL; 572 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; 573 return 0; 574 575 case HDLCDRVCTL_GETSAMPLES: 576#ifndef HDLCDRV_DEBUG 577 return -EPERM; 578#else /* HDLCDRV_DEBUG */ 579 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 580 return -EAGAIN; 581 bi.data.bits = 582 s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; 583 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % 584 sizeof(s->bitbuf_channel.buffer); 585 break; 586#endif /* HDLCDRV_DEBUG */ 587 588 case HDLCDRVCTL_GETBITS: 589#ifndef HDLCDRV_DEBUG 590 return -EPERM; 591#else /* HDLCDRV_DEBUG */ 592 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 593 return -EAGAIN; 594 bi.data.bits = 595 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; 596 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % 597 sizeof(s->bitbuf_hdlc.buffer); 598 break; 599#endif /* HDLCDRV_DEBUG */ 600 601 case HDLCDRVCTL_DRIVERNAME: 602 if (s->ops && s->ops->drvname) { 603 strscpy(bi.data.drivername, s->ops->drvname, 604 sizeof(bi.data.drivername)); 605 break; 606 } 607 bi.data.drivername[0] = '\0'; 608 break; 609 610 } 611 if (copy_to_user(data, &bi, sizeof(bi))) 612 return -EFAULT; 613 return 0; 614 615} 616 617/* --------------------------------------------------------------------- */ 618 619static const struct net_device_ops hdlcdrv_netdev = { 620 .ndo_open = hdlcdrv_open, 621 .ndo_stop = hdlcdrv_close, 622 .ndo_start_xmit = hdlcdrv_send_packet, 623 .ndo_siocdevprivate = hdlcdrv_siocdevprivate, 624 .ndo_set_mac_address = hdlcdrv_set_mac_address, 625}; 626 627/* 628 * Initialize fields in hdlcdrv 629 */ 630static void hdlcdrv_setup(struct net_device *dev) 631{ 632 static const struct hdlcdrv_channel_params dflt_ch_params = { 633 20, 2, 10, 40, 0 634 }; 635 struct hdlcdrv_state *s = netdev_priv(dev); 636 637 /* 638 * initialize the hdlcdrv_state struct 639 */ 640 s->ch_params = dflt_ch_params; 641 s->ptt_keyed = 0; 642 643 spin_lock_init(&s->hdlcrx.hbuf.lock); 644 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 645 s->hdlcrx.in_hdlc_rx = 0; 646 s->hdlcrx.rx_state = 0; 647 648 spin_lock_init(&s->hdlctx.hbuf.lock); 649 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 650 s->hdlctx.in_hdlc_tx = 0; 651 s->hdlctx.tx_state = 1; 652 s->hdlctx.numflags = 0; 653 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 654 s->hdlctx.ptt = 0; 655 s->hdlctx.slotcnt = s->ch_params.slottime; 656 s->hdlctx.calibrate = 0; 657 658#ifdef HDLCDRV_DEBUG 659 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; 660 s->bitbuf_channel.shreg = 0x80; 661 662 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; 663 s->bitbuf_hdlc.shreg = 0x80; 664#endif /* HDLCDRV_DEBUG */ 665 666 667 /* Fill in the fields of the device structure */ 668 669 s->skb = NULL; 670 671 dev->netdev_ops = &hdlcdrv_netdev; 672 dev->header_ops = &ax25_header_ops; 673 674 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 675 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 676 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 677 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 678 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 679 dev_addr_set(dev, (u8 *)&ax25_defaddr); 680 dev->tx_queue_len = 16; 681} 682 683/* --------------------------------------------------------------------- */ 684struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 685 unsigned int privsize, const char *ifname, 686 unsigned int baseaddr, unsigned int irq, 687 unsigned int dma) 688{ 689 struct net_device *dev; 690 struct hdlcdrv_state *s; 691 int err; 692 693 if (privsize < sizeof(struct hdlcdrv_state)) 694 privsize = sizeof(struct hdlcdrv_state); 695 696 dev = alloc_netdev(privsize, ifname, NET_NAME_UNKNOWN, hdlcdrv_setup); 697 if (!dev) 698 return ERR_PTR(-ENOMEM); 699 700 /* 701 * initialize part of the hdlcdrv_state struct 702 */ 703 s = netdev_priv(dev); 704 s->magic = HDLCDRV_MAGIC; 705 s->ops = ops; 706 dev->base_addr = baseaddr; 707 dev->irq = irq; 708 dev->dma = dma; 709 710 err = register_netdev(dev); 711 if (err < 0) { 712 printk(KERN_WARNING "hdlcdrv: cannot register net " 713 "device %s\n", dev->name); 714 free_netdev(dev); 715 dev = ERR_PTR(err); 716 } 717 return dev; 718} 719 720/* --------------------------------------------------------------------- */ 721 722void hdlcdrv_unregister(struct net_device *dev) 723{ 724 struct hdlcdrv_state *s = netdev_priv(dev); 725 726 BUG_ON(s->magic != HDLCDRV_MAGIC); 727 728 if (s->opened && s->ops->close) 729 s->ops->close(dev); 730 unregister_netdev(dev); 731 732 free_netdev(dev); 733} 734 735/* --------------------------------------------------------------------- */ 736 737EXPORT_SYMBOL(hdlcdrv_receiver); 738EXPORT_SYMBOL(hdlcdrv_transmitter); 739EXPORT_SYMBOL(hdlcdrv_arbitrate); 740EXPORT_SYMBOL(hdlcdrv_register); 741EXPORT_SYMBOL(hdlcdrv_unregister); 742 743/* --------------------------------------------------------------------- */ 744 745static int __init hdlcdrv_init_driver(void) 746{ 747 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 748 printk(KERN_INFO "hdlcdrv: version 0.8\n"); 749 return 0; 750} 751 752/* --------------------------------------------------------------------- */ 753 754static void __exit hdlcdrv_cleanup_driver(void) 755{ 756 printk(KERN_INFO "hdlcdrv: cleanup\n"); 757} 758 759/* --------------------------------------------------------------------- */ 760 761MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 762MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 763MODULE_LICENSE("GPL"); 764module_init(hdlcdrv_init_driver); 765module_exit(hdlcdrv_cleanup_driver); 766 767/* --------------------------------------------------------------------- */ 768