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/slab.h> 52 #include <linux/errno.h> 53 #include <linux/init.h> 54 #include <linux/bitops.h> 55 56 #include <linux/netdevice.h> 57 #include <linux/if_arp.h> 58 #include <linux/skbuff.h> 59 #include <linux/hdlcdrv.h> 60 #include <linux/random.h> 61 #include <net/ax25.h> 62 #include <asm/uaccess.h> 63 64 #include <linux/crc-ccitt.h> 65 66 /* --------------------------------------------------------------------- */ 67 68 #define KISS_VERBOSE 69 70 /* --------------------------------------------------------------------- */ 71 72 #define PARAM_TXDELAY 1 73 #define PARAM_PERSIST 2 74 #define PARAM_SLOTTIME 3 75 #define PARAM_TXTAIL 4 76 #define PARAM_FULLDUP 5 77 #define PARAM_HARDWARE 6 78 #define PARAM_RETURN 255 79 80 /* --------------------------------------------------------------------- */ 81 /* 82 * the CRC routines are stolen from WAMPES 83 * by Dieter Deyke 84 */ 85 86 87 /*---------------------------------------------------------------------------*/ 88 89 static inline void append_crc_ccitt(unsigned char *buffer, int len) 90 { 91 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; 92 buffer += len; 93 *buffer++ = crc; 94 *buffer++ = crc >> 8; 95 } 96 97 /*---------------------------------------------------------------------------*/ 98 99 static inline int check_crc_ccitt(const unsigned char *buf, int cnt) 100 { 101 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; 102 } 103 104 /*---------------------------------------------------------------------------*/ 105 106 #if 0 107 static int calc_crc_ccitt(const unsigned char *buf, int cnt) 108 { 109 unsigned int crc = 0xffff; 110 111 for (; cnt > 0; cnt--) 112 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; 113 crc ^= 0xffff; 114 return (crc & 0xffff); 115 } 116 #endif 117 118 /* ---------------------------------------------------------------------- */ 119 120 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) 121 122 /* ---------------------------------------------------------------------- */ 123 /* 124 * The HDLC routines 125 */ 126 127 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, 128 int num) 129 { 130 int added = 0; 131 132 while (s->hdlcrx.rx_state && num >= 8) { 133 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { 134 s->hdlcrx.rx_state = 0; 135 return 0; 136 } 137 *s->hdlcrx.bp++ = bits >> (32-num); 138 s->hdlcrx.len++; 139 num -= 8; 140 added += 8; 141 } 142 return added; 143 } 144 145 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) 146 { 147 struct sk_buff *skb; 148 int pkt_len; 149 unsigned char *cp; 150 151 if (s->hdlcrx.len < 4) 152 return; 153 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) 154 return; 155 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ 156 if (!(skb = dev_alloc_skb(pkt_len))) { 157 printk("%s: memory squeeze, dropping packet\n", dev->name); 158 dev->stats.rx_dropped++; 159 return; 160 } 161 cp = skb_put(skb, pkt_len); 162 *cp++ = 0; /* KISS kludge */ 163 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); 164 skb->protocol = ax25_type_trans(skb, dev); 165 netif_rx(skb); 166 dev->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 dev->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 netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, 404 struct net_device *dev) 405 { 406 struct hdlcdrv_state *sm = netdev_priv(dev); 407 408 if (skb->data[0] != 0) { 409 do_kiss_params(sm, skb->data, skb->len); 410 dev_kfree_skb(skb); 411 return NETDEV_TX_OK; 412 } 413 if (sm->skb) 414 return NETDEV_TX_LOCKED; 415 netif_stop_queue(dev); 416 sm->skb = skb; 417 return NETDEV_TX_OK; 418 } 419 420 /* --------------------------------------------------------------------- */ 421 422 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 423 { 424 struct sockaddr *sa = (struct sockaddr *)addr; 425 426 /* addr is an AX.25 shifted ASCII mac address */ 427 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 428 return 0; 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 */ 440 441 static 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 */ 477 478 static 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 /* --------------------------------------------------------------------- */ 495 496 static 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 = dev->stats.tx_packets; 561 bi.data.cs.tx_errors = dev->stats.tx_errors; 562 bi.data.cs.rx_packets = dev->stats.rx_packets; 563 bi.data.cs.rx_errors = dev->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 static const struct net_device_ops hdlcdrv_netdev = { 623 .ndo_open = hdlcdrv_open, 624 .ndo_stop = hdlcdrv_close, 625 .ndo_start_xmit = hdlcdrv_send_packet, 626 .ndo_do_ioctl = hdlcdrv_ioctl, 627 .ndo_set_mac_address = hdlcdrv_set_mac_address, 628 }; 629 630 /* 631 * Initialize fields in hdlcdrv 632 */ 633 static void hdlcdrv_setup(struct net_device *dev) 634 { 635 static const struct hdlcdrv_channel_params dflt_ch_params = { 636 20, 2, 10, 40, 0 637 }; 638 struct hdlcdrv_state *s = netdev_priv(dev); 639 640 /* 641 * initialize the hdlcdrv_state struct 642 */ 643 s->ch_params = dflt_ch_params; 644 s->ptt_keyed = 0; 645 646 spin_lock_init(&s->hdlcrx.hbuf.lock); 647 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 648 s->hdlcrx.in_hdlc_rx = 0; 649 s->hdlcrx.rx_state = 0; 650 651 spin_lock_init(&s->hdlctx.hbuf.lock); 652 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 653 s->hdlctx.in_hdlc_tx = 0; 654 s->hdlctx.tx_state = 1; 655 s->hdlctx.numflags = 0; 656 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 657 s->hdlctx.ptt = 0; 658 s->hdlctx.slotcnt = s->ch_params.slottime; 659 s->hdlctx.calibrate = 0; 660 661 #ifdef HDLCDRV_DEBUG 662 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; 663 s->bitbuf_channel.shreg = 0x80; 664 665 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; 666 s->bitbuf_hdlc.shreg = 0x80; 667 #endif /* HDLCDRV_DEBUG */ 668 669 670 /* Fill in the fields of the device structure */ 671 672 s->skb = NULL; 673 674 dev->netdev_ops = &hdlcdrv_netdev; 675 dev->header_ops = &ax25_header_ops; 676 677 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 678 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 679 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 680 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 681 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); 682 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); 683 dev->tx_queue_len = 16; 684 } 685 686 /* --------------------------------------------------------------------- */ 687 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 688 unsigned int privsize, const char *ifname, 689 unsigned int baseaddr, unsigned int irq, 690 unsigned int dma) 691 { 692 struct net_device *dev; 693 struct hdlcdrv_state *s; 694 int err; 695 696 BUG_ON(ops == NULL); 697 698 if (privsize < sizeof(struct hdlcdrv_state)) 699 privsize = sizeof(struct hdlcdrv_state); 700 701 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup); 702 if (!dev) 703 return ERR_PTR(-ENOMEM); 704 705 /* 706 * initialize part of the hdlcdrv_state struct 707 */ 708 s = netdev_priv(dev); 709 s->magic = HDLCDRV_MAGIC; 710 s->ops = ops; 711 dev->base_addr = baseaddr; 712 dev->irq = irq; 713 dev->dma = dma; 714 715 err = register_netdev(dev); 716 if (err < 0) { 717 printk(KERN_WARNING "hdlcdrv: cannot register net " 718 "device %s\n", dev->name); 719 free_netdev(dev); 720 dev = ERR_PTR(err); 721 } 722 return dev; 723 } 724 725 /* --------------------------------------------------------------------- */ 726 727 void hdlcdrv_unregister(struct net_device *dev) 728 { 729 struct hdlcdrv_state *s = netdev_priv(dev); 730 731 BUG_ON(s->magic != HDLCDRV_MAGIC); 732 733 if (s->opened && s->ops->close) 734 s->ops->close(dev); 735 unregister_netdev(dev); 736 737 free_netdev(dev); 738 } 739 740 /* --------------------------------------------------------------------- */ 741 742 EXPORT_SYMBOL(hdlcdrv_receiver); 743 EXPORT_SYMBOL(hdlcdrv_transmitter); 744 EXPORT_SYMBOL(hdlcdrv_arbitrate); 745 EXPORT_SYMBOL(hdlcdrv_register); 746 EXPORT_SYMBOL(hdlcdrv_unregister); 747 748 /* --------------------------------------------------------------------- */ 749 750 static int __init hdlcdrv_init_driver(void) 751 { 752 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 753 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n"); 754 return 0; 755 } 756 757 /* --------------------------------------------------------------------- */ 758 759 static void __exit hdlcdrv_cleanup_driver(void) 760 { 761 printk(KERN_INFO "hdlcdrv: cleanup\n"); 762 } 763 764 /* --------------------------------------------------------------------- */ 765 766 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 767 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 768 MODULE_LICENSE("GPL"); 769 module_init(hdlcdrv_init_driver); 770 module_exit(hdlcdrv_cleanup_driver); 771 772 /* --------------------------------------------------------------------- */ 773