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 88 static 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 98 static 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 0 106 static 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 */ 125 126 static 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 } 143 144 static 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 s->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->last_rx = jiffies; 166 s->stats.rx_packets++; 167 } 168 169 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) 170 { 171 int i; 172 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; 173 174 if (!s || s->magic != HDLCDRV_MAGIC) 175 return; 176 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) 177 return; 178 179 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { 180 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); 181 182 #ifdef HDLCDRV_DEBUG 183 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); 184 #endif /* HDLCDRV_DEBUG */ 185 s->hdlcrx.bitstream >>= 16; 186 s->hdlcrx.bitstream |= word << 16; 187 s->hdlcrx.bitbuf >>= 16; 188 s->hdlcrx.bitbuf |= word << 16; 189 s->hdlcrx.numbits += 16; 190 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, 191 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 192 i >= 0; 193 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 194 mask5 <<= 1, mask6 = (mask6 << 1) | 1) { 195 if ((s->hdlcrx.bitstream & mask1) == mask1) 196 s->hdlcrx.rx_state = 0; /* abort received */ 197 else if ((s->hdlcrx.bitstream & mask2) == mask3) { 198 /* flag received */ 199 if (s->hdlcrx.rx_state) { 200 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 201 << (8+i), 202 s->hdlcrx.numbits 203 -8-i); 204 hdlc_rx_flag(dev, s); 205 } 206 s->hdlcrx.len = 0; 207 s->hdlcrx.bp = s->hdlcrx.buffer; 208 s->hdlcrx.rx_state = 1; 209 s->hdlcrx.numbits = i; 210 } else if ((s->hdlcrx.bitstream & mask4) == mask5) { 211 /* stuffed bit */ 212 s->hdlcrx.numbits--; 213 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | 214 ((s->hdlcrx.bitbuf & mask6) << 1); 215 } 216 } 217 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, 218 s->hdlcrx.numbits); 219 } 220 clear_bit(0, &s->hdlcrx.in_hdlc_rx); 221 } 222 223 /* ---------------------------------------------------------------------- */ 224 225 static inline void do_kiss_params(struct hdlcdrv_state *s, 226 unsigned char *data, unsigned long len) 227 { 228 229 #ifdef KISS_VERBOSE 230 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) 231 #else /* KISS_VERBOSE */ 232 #define PKP(a,b) 233 #endif /* KISS_VERBOSE */ 234 235 if (len < 2) 236 return; 237 switch(data[0]) { 238 case PARAM_TXDELAY: 239 s->ch_params.tx_delay = data[1]; 240 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); 241 break; 242 case PARAM_PERSIST: 243 s->ch_params.ppersist = data[1]; 244 PKP("p persistence = %u", s->ch_params.ppersist); 245 break; 246 case PARAM_SLOTTIME: 247 s->ch_params.slottime = data[1]; 248 PKP("slot time = %ums", s->ch_params.slottime); 249 break; 250 case PARAM_TXTAIL: 251 s->ch_params.tx_tail = data[1]; 252 PKP("TX tail = %ums", s->ch_params.tx_tail); 253 break; 254 case PARAM_FULLDUP: 255 s->ch_params.fulldup = !!data[1]; 256 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); 257 break; 258 default: 259 break; 260 } 261 #undef PKP 262 } 263 264 /* ---------------------------------------------------------------------- */ 265 266 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) 267 { 268 unsigned int mask1, mask2, mask3; 269 int i; 270 struct sk_buff *skb; 271 int pkt_len; 272 273 if (!s || s->magic != HDLCDRV_MAGIC) 274 return; 275 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) 276 return; 277 for (;;) { 278 if (s->hdlctx.numbits >= 16) { 279 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { 280 clear_bit(0, &s->hdlctx.in_hdlc_tx); 281 return; 282 } 283 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); 284 s->hdlctx.bitbuf >>= 16; 285 s->hdlctx.numbits -= 16; 286 } 287 switch (s->hdlctx.tx_state) { 288 default: 289 clear_bit(0, &s->hdlctx.in_hdlc_tx); 290 return; 291 case 0: 292 case 1: 293 if (s->hdlctx.numflags) { 294 s->hdlctx.numflags--; 295 s->hdlctx.bitbuf |= 296 0x7e7e << s->hdlctx.numbits; 297 s->hdlctx.numbits += 16; 298 break; 299 } 300 if (s->hdlctx.tx_state == 1) { 301 clear_bit(0, &s->hdlctx.in_hdlc_tx); 302 return; 303 } 304 if (!(skb = s->skb)) { 305 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); 306 if (flgs < 2) 307 flgs = 2; 308 s->hdlctx.tx_state = 1; 309 s->hdlctx.numflags = flgs; 310 break; 311 } 312 s->skb = NULL; 313 netif_wake_queue(dev); 314 pkt_len = skb->len-1; /* strip KISS byte */ 315 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { 316 s->hdlctx.tx_state = 0; 317 s->hdlctx.numflags = 1; 318 dev_kfree_skb_irq(skb); 319 break; 320 } 321 skb_copy_from_linear_data_offset(skb, 1, 322 s->hdlctx.buffer, 323 pkt_len); 324 dev_kfree_skb_irq(skb); 325 s->hdlctx.bp = s->hdlctx.buffer; 326 append_crc_ccitt(s->hdlctx.buffer, pkt_len); 327 s->hdlctx.len = pkt_len+2; /* the appended CRC */ 328 s->hdlctx.tx_state = 2; 329 s->hdlctx.bitstream = 0; 330 s->stats.tx_packets++; 331 break; 332 case 2: 333 if (!s->hdlctx.len) { 334 s->hdlctx.tx_state = 0; 335 s->hdlctx.numflags = 1; 336 break; 337 } 338 s->hdlctx.len--; 339 s->hdlctx.bitbuf |= *s->hdlctx.bp << 340 s->hdlctx.numbits; 341 s->hdlctx.bitstream >>= 8; 342 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; 343 mask1 = 0x1f000; 344 mask2 = 0x10000; 345 mask3 = 0xffffffff >> (31-s->hdlctx.numbits); 346 s->hdlctx.numbits += 8; 347 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 348 mask3 = (mask3 << 1) | 1) { 349 if ((s->hdlctx.bitstream & mask1) != mask1) 350 continue; 351 s->hdlctx.bitstream &= ~mask2; 352 s->hdlctx.bitbuf = 353 (s->hdlctx.bitbuf & mask3) | 354 ((s->hdlctx.bitbuf & 355 (~mask3)) << 1); 356 s->hdlctx.numbits++; 357 mask3 = (mask3 << 1) | 1; 358 } 359 break; 360 } 361 } 362 } 363 364 /* ---------------------------------------------------------------------- */ 365 366 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) 367 { 368 s->hdlctx.tx_state = 0; 369 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); 370 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; 371 hdlcdrv_transmitter(dev, s); 372 s->hdlctx.ptt = 1; 373 s->ptt_keyed++; 374 } 375 376 /* ---------------------------------------------------------------------- */ 377 378 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) 379 { 380 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 381 return; 382 if (s->ch_params.fulldup) { 383 start_tx(dev, s); 384 return; 385 } 386 if (s->hdlcrx.dcd) { 387 s->hdlctx.slotcnt = s->ch_params.slottime; 388 return; 389 } 390 if ((--s->hdlctx.slotcnt) > 0) 391 return; 392 s->hdlctx.slotcnt = s->ch_params.slottime; 393 if ((random32() % 256) > s->ch_params.ppersist) 394 return; 395 start_tx(dev, s); 396 } 397 398 /* --------------------------------------------------------------------- */ 399 /* 400 * ===================== network driver interface ========================= 401 */ 402 403 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev) 404 { 405 struct hdlcdrv_state *sm = netdev_priv(dev); 406 407 if (skb->data[0] != 0) { 408 do_kiss_params(sm, skb->data, skb->len); 409 dev_kfree_skb(skb); 410 return 0; 411 } 412 if (sm->skb) 413 return -1; 414 netif_stop_queue(dev); 415 sm->skb = skb; 416 return 0; 417 } 418 419 /* --------------------------------------------------------------------- */ 420 421 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 422 { 423 struct sockaddr *sa = (struct sockaddr *)addr; 424 425 /* addr is an AX.25 shifted ASCII mac address */ 426 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 427 return 0; 428 } 429 430 /* --------------------------------------------------------------------- */ 431 432 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev) 433 { 434 struct hdlcdrv_state *sm = netdev_priv(dev); 435 436 /* 437 * Get the current statistics. This may be called with the 438 * card open or closed. 439 */ 440 return &sm->stats; 441 } 442 443 /* --------------------------------------------------------------------- */ 444 /* 445 * Open/initialize the board. This is called (in the current kernel) 446 * sometime after booting when the 'ifconfig' program is run. 447 * 448 * This routine should set everything up anew at each open, even 449 * registers that "should" only need to be set once at boot, so that 450 * there is non-reboot way to recover if something goes wrong. 451 */ 452 453 static int hdlcdrv_open(struct net_device *dev) 454 { 455 struct hdlcdrv_state *s = netdev_priv(dev); 456 int i; 457 458 if (!s->ops || !s->ops->open) 459 return -ENODEV; 460 461 /* 462 * initialise some variables 463 */ 464 s->opened = 1; 465 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 466 s->hdlcrx.in_hdlc_rx = 0; 467 s->hdlcrx.rx_state = 0; 468 469 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 470 s->hdlctx.in_hdlc_tx = 0; 471 s->hdlctx.tx_state = 1; 472 s->hdlctx.numflags = 0; 473 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 474 s->hdlctx.ptt = 0; 475 s->hdlctx.slotcnt = s->ch_params.slottime; 476 s->hdlctx.calibrate = 0; 477 478 i = s->ops->open(dev); 479 if (i) 480 return i; 481 netif_start_queue(dev); 482 return 0; 483 } 484 485 /* --------------------------------------------------------------------- */ 486 /* 487 * The inverse routine to hdlcdrv_open(). 488 */ 489 490 static int hdlcdrv_close(struct net_device *dev) 491 { 492 struct hdlcdrv_state *s = netdev_priv(dev); 493 int i = 0; 494 495 netif_stop_queue(dev); 496 497 if (s->ops && s->ops->close) 498 i = s->ops->close(dev); 499 if (s->skb) 500 dev_kfree_skb(s->skb); 501 s->skb = NULL; 502 s->opened = 0; 503 return i; 504 } 505 506 /* --------------------------------------------------------------------- */ 507 508 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 509 { 510 struct hdlcdrv_state *s = netdev_priv(dev); 511 struct hdlcdrv_ioctl bi; 512 513 if (cmd != SIOCDEVPRIVATE) { 514 if (s->ops && s->ops->ioctl) 515 return s->ops->ioctl(dev, ifr, &bi, cmd); 516 return -ENOIOCTLCMD; 517 } 518 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) 519 return -EFAULT; 520 521 switch (bi.cmd) { 522 default: 523 if (s->ops && s->ops->ioctl) 524 return s->ops->ioctl(dev, ifr, &bi, cmd); 525 return -ENOIOCTLCMD; 526 527 case HDLCDRVCTL_GETCHANNELPAR: 528 bi.data.cp.tx_delay = s->ch_params.tx_delay; 529 bi.data.cp.tx_tail = s->ch_params.tx_tail; 530 bi.data.cp.slottime = s->ch_params.slottime; 531 bi.data.cp.ppersist = s->ch_params.ppersist; 532 bi.data.cp.fulldup = s->ch_params.fulldup; 533 break; 534 535 case HDLCDRVCTL_SETCHANNELPAR: 536 if (!capable(CAP_NET_ADMIN)) 537 return -EACCES; 538 s->ch_params.tx_delay = bi.data.cp.tx_delay; 539 s->ch_params.tx_tail = bi.data.cp.tx_tail; 540 s->ch_params.slottime = bi.data.cp.slottime; 541 s->ch_params.ppersist = bi.data.cp.ppersist; 542 s->ch_params.fulldup = bi.data.cp.fulldup; 543 s->hdlctx.slotcnt = 1; 544 return 0; 545 546 case HDLCDRVCTL_GETMODEMPAR: 547 bi.data.mp.iobase = dev->base_addr; 548 bi.data.mp.irq = dev->irq; 549 bi.data.mp.dma = dev->dma; 550 bi.data.mp.dma2 = s->ptt_out.dma2; 551 bi.data.mp.seriobase = s->ptt_out.seriobase; 552 bi.data.mp.pariobase = s->ptt_out.pariobase; 553 bi.data.mp.midiiobase = s->ptt_out.midiiobase; 554 break; 555 556 case HDLCDRVCTL_SETMODEMPAR: 557 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) 558 return -EACCES; 559 dev->base_addr = bi.data.mp.iobase; 560 dev->irq = bi.data.mp.irq; 561 dev->dma = bi.data.mp.dma; 562 s->ptt_out.dma2 = bi.data.mp.dma2; 563 s->ptt_out.seriobase = bi.data.mp.seriobase; 564 s->ptt_out.pariobase = bi.data.mp.pariobase; 565 s->ptt_out.midiiobase = bi.data.mp.midiiobase; 566 return 0; 567 568 case HDLCDRVCTL_GETSTAT: 569 bi.data.cs.ptt = hdlcdrv_ptt(s); 570 bi.data.cs.dcd = s->hdlcrx.dcd; 571 bi.data.cs.ptt_keyed = s->ptt_keyed; 572 bi.data.cs.tx_packets = s->stats.tx_packets; 573 bi.data.cs.tx_errors = s->stats.tx_errors; 574 bi.data.cs.rx_packets = s->stats.rx_packets; 575 bi.data.cs.rx_errors = s->stats.rx_errors; 576 break; 577 578 case HDLCDRVCTL_OLDGETSTAT: 579 bi.data.ocs.ptt = hdlcdrv_ptt(s); 580 bi.data.ocs.dcd = s->hdlcrx.dcd; 581 bi.data.ocs.ptt_keyed = s->ptt_keyed; 582 break; 583 584 case HDLCDRVCTL_CALIBRATE: 585 if(!capable(CAP_SYS_RAWIO)) 586 return -EPERM; 587 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; 588 return 0; 589 590 case HDLCDRVCTL_GETSAMPLES: 591 #ifndef HDLCDRV_DEBUG 592 return -EPERM; 593 #else /* HDLCDRV_DEBUG */ 594 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 595 return -EAGAIN; 596 bi.data.bits = 597 s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; 598 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % 599 sizeof(s->bitbuf_channel.buffer); 600 break; 601 #endif /* HDLCDRV_DEBUG */ 602 603 case HDLCDRVCTL_GETBITS: 604 #ifndef HDLCDRV_DEBUG 605 return -EPERM; 606 #else /* HDLCDRV_DEBUG */ 607 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 608 return -EAGAIN; 609 bi.data.bits = 610 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; 611 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % 612 sizeof(s->bitbuf_hdlc.buffer); 613 break; 614 #endif /* HDLCDRV_DEBUG */ 615 616 case HDLCDRVCTL_DRIVERNAME: 617 if (s->ops && s->ops->drvname) { 618 strncpy(bi.data.drivername, s->ops->drvname, 619 sizeof(bi.data.drivername)); 620 break; 621 } 622 bi.data.drivername[0] = '\0'; 623 break; 624 625 } 626 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) 627 return -EFAULT; 628 return 0; 629 630 } 631 632 /* --------------------------------------------------------------------- */ 633 634 /* 635 * Initialize fields in hdlcdrv 636 */ 637 static 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 * initialize the device struct 675 */ 676 dev->open = hdlcdrv_open; 677 dev->stop = hdlcdrv_close; 678 dev->do_ioctl = hdlcdrv_ioctl; 679 dev->hard_start_xmit = hdlcdrv_send_packet; 680 dev->get_stats = hdlcdrv_get_stats; 681 682 /* Fill in the fields of the device structure */ 683 684 s->skb = NULL; 685 686 dev->header_ops = &ax25_header_ops; 687 dev->set_mac_address = hdlcdrv_set_mac_address; 688 689 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 690 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 691 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 692 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 693 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 694 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); 695 dev->tx_queue_len = 16; 696 } 697 698 /* --------------------------------------------------------------------- */ 699 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 700 unsigned int privsize, const char *ifname, 701 unsigned int baseaddr, unsigned int irq, 702 unsigned int dma) 703 { 704 struct net_device *dev; 705 struct hdlcdrv_state *s; 706 int err; 707 708 BUG_ON(ops == NULL); 709 710 if (privsize < sizeof(struct hdlcdrv_state)) 711 privsize = sizeof(struct hdlcdrv_state); 712 713 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup); 714 if (!dev) 715 return ERR_PTR(-ENOMEM); 716 717 /* 718 * initialize part of the hdlcdrv_state struct 719 */ 720 s = netdev_priv(dev); 721 s->magic = HDLCDRV_MAGIC; 722 s->ops = ops; 723 dev->base_addr = baseaddr; 724 dev->irq = irq; 725 dev->dma = dma; 726 727 err = register_netdev(dev); 728 if (err < 0) { 729 printk(KERN_WARNING "hdlcdrv: cannot register net " 730 "device %s\n", dev->name); 731 free_netdev(dev); 732 dev = ERR_PTR(err); 733 } 734 return dev; 735 } 736 737 /* --------------------------------------------------------------------- */ 738 739 void hdlcdrv_unregister(struct net_device *dev) 740 { 741 struct hdlcdrv_state *s = netdev_priv(dev); 742 743 BUG_ON(s->magic != HDLCDRV_MAGIC); 744 745 if (s->opened && s->ops->close) 746 s->ops->close(dev); 747 unregister_netdev(dev); 748 749 free_netdev(dev); 750 } 751 752 /* --------------------------------------------------------------------- */ 753 754 EXPORT_SYMBOL(hdlcdrv_receiver); 755 EXPORT_SYMBOL(hdlcdrv_transmitter); 756 EXPORT_SYMBOL(hdlcdrv_arbitrate); 757 EXPORT_SYMBOL(hdlcdrv_register); 758 EXPORT_SYMBOL(hdlcdrv_unregister); 759 760 /* --------------------------------------------------------------------- */ 761 762 static int __init hdlcdrv_init_driver(void) 763 { 764 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 765 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n"); 766 return 0; 767 } 768 769 /* --------------------------------------------------------------------- */ 770 771 static void __exit hdlcdrv_cleanup_driver(void) 772 { 773 printk(KERN_INFO "hdlcdrv: cleanup\n"); 774 } 775 776 /* --------------------------------------------------------------------- */ 777 778 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 779 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 780 MODULE_LICENSE("GPL"); 781 module_init(hdlcdrv_init_driver); 782 module_exit(hdlcdrv_cleanup_driver); 783 784 /* --------------------------------------------------------------------- */ 785