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 <net/ax25.h> 60 #include <asm/uaccess.h> 61 62 #include <linux/crc-ccitt.h> 63 64 /* --------------------------------------------------------------------- */ 65 66 /* 67 * The name of the card. Is used for messages and in the requests for 68 * io regions, irqs and dma channels 69 */ 70 71 static char ax25_bcast[AX25_ADDR_LEN] = 72 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1}; 73 static char ax25_nocall[AX25_ADDR_LEN] = 74 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1}; 75 76 /* --------------------------------------------------------------------- */ 77 78 #define KISS_VERBOSE 79 80 /* --------------------------------------------------------------------- */ 81 82 #define PARAM_TXDELAY 1 83 #define PARAM_PERSIST 2 84 #define PARAM_SLOTTIME 3 85 #define PARAM_TXTAIL 4 86 #define PARAM_FULLDUP 5 87 #define PARAM_HARDWARE 6 88 #define PARAM_RETURN 255 89 90 /* --------------------------------------------------------------------- */ 91 /* 92 * the CRC routines are stolen from WAMPES 93 * by Dieter Deyke 94 */ 95 96 97 /*---------------------------------------------------------------------------*/ 98 99 static inline void append_crc_ccitt(unsigned char *buffer, int len) 100 { 101 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; 102 *buffer++ = crc; 103 *buffer++ = crc >> 8; 104 } 105 106 /*---------------------------------------------------------------------------*/ 107 108 static inline int check_crc_ccitt(const unsigned char *buf, int cnt) 109 { 110 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; 111 } 112 113 /*---------------------------------------------------------------------------*/ 114 115 #if 0 116 static int calc_crc_ccitt(const unsigned char *buf, int cnt) 117 { 118 unsigned int crc = 0xffff; 119 120 for (; cnt > 0; cnt--) 121 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; 122 crc ^= 0xffff; 123 return (crc & 0xffff); 124 } 125 #endif 126 127 /* ---------------------------------------------------------------------- */ 128 129 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) 130 131 /* ---------------------------------------------------------------------- */ 132 /* 133 * The HDLC routines 134 */ 135 136 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, 137 int num) 138 { 139 int added = 0; 140 141 while (s->hdlcrx.rx_state && num >= 8) { 142 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { 143 s->hdlcrx.rx_state = 0; 144 return 0; 145 } 146 *s->hdlcrx.bp++ = bits >> (32-num); 147 s->hdlcrx.len++; 148 num -= 8; 149 added += 8; 150 } 151 return added; 152 } 153 154 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) 155 { 156 struct sk_buff *skb; 157 int pkt_len; 158 unsigned char *cp; 159 160 if (s->hdlcrx.len < 4) 161 return; 162 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) 163 return; 164 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ 165 if (!(skb = dev_alloc_skb(pkt_len))) { 166 printk("%s: memory squeeze, dropping packet\n", dev->name); 167 s->stats.rx_dropped++; 168 return; 169 } 170 cp = skb_put(skb, pkt_len); 171 *cp++ = 0; /* KISS kludge */ 172 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); 173 skb->protocol = ax25_type_trans(skb, dev); 174 netif_rx(skb); 175 dev->last_rx = jiffies; 176 s->stats.rx_packets++; 177 } 178 179 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) 180 { 181 int i; 182 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; 183 184 if (!s || s->magic != HDLCDRV_MAGIC) 185 return; 186 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) 187 return; 188 189 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { 190 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); 191 192 #ifdef HDLCDRV_DEBUG 193 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); 194 #endif /* HDLCDRV_DEBUG */ 195 s->hdlcrx.bitstream >>= 16; 196 s->hdlcrx.bitstream |= word << 16; 197 s->hdlcrx.bitbuf >>= 16; 198 s->hdlcrx.bitbuf |= word << 16; 199 s->hdlcrx.numbits += 16; 200 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, 201 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; 202 i >= 0; 203 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, 204 mask5 <<= 1, mask6 = (mask6 << 1) | 1) { 205 if ((s->hdlcrx.bitstream & mask1) == mask1) 206 s->hdlcrx.rx_state = 0; /* abort received */ 207 else if ((s->hdlcrx.bitstream & mask2) == mask3) { 208 /* flag received */ 209 if (s->hdlcrx.rx_state) { 210 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf 211 << (8+i), 212 s->hdlcrx.numbits 213 -8-i); 214 hdlc_rx_flag(dev, s); 215 } 216 s->hdlcrx.len = 0; 217 s->hdlcrx.bp = s->hdlcrx.buffer; 218 s->hdlcrx.rx_state = 1; 219 s->hdlcrx.numbits = i; 220 } else if ((s->hdlcrx.bitstream & mask4) == mask5) { 221 /* stuffed bit */ 222 s->hdlcrx.numbits--; 223 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | 224 ((s->hdlcrx.bitbuf & mask6) << 1); 225 } 226 } 227 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, 228 s->hdlcrx.numbits); 229 } 230 clear_bit(0, &s->hdlcrx.in_hdlc_rx); 231 } 232 233 /* ---------------------------------------------------------------------- */ 234 235 static inline void do_kiss_params(struct hdlcdrv_state *s, 236 unsigned char *data, unsigned long len) 237 { 238 239 #ifdef KISS_VERBOSE 240 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) 241 #else /* KISS_VERBOSE */ 242 #define PKP(a,b) 243 #endif /* KISS_VERBOSE */ 244 245 if (len < 2) 246 return; 247 switch(data[0]) { 248 case PARAM_TXDELAY: 249 s->ch_params.tx_delay = data[1]; 250 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); 251 break; 252 case PARAM_PERSIST: 253 s->ch_params.ppersist = data[1]; 254 PKP("p persistence = %u", s->ch_params.ppersist); 255 break; 256 case PARAM_SLOTTIME: 257 s->ch_params.slottime = data[1]; 258 PKP("slot time = %ums", s->ch_params.slottime); 259 break; 260 case PARAM_TXTAIL: 261 s->ch_params.tx_tail = data[1]; 262 PKP("TX tail = %ums", s->ch_params.tx_tail); 263 break; 264 case PARAM_FULLDUP: 265 s->ch_params.fulldup = !!data[1]; 266 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); 267 break; 268 default: 269 break; 270 } 271 #undef PKP 272 } 273 274 /* ---------------------------------------------------------------------- */ 275 276 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) 277 { 278 unsigned int mask1, mask2, mask3; 279 int i; 280 struct sk_buff *skb; 281 int pkt_len; 282 283 if (!s || s->magic != HDLCDRV_MAGIC) 284 return; 285 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) 286 return; 287 for (;;) { 288 if (s->hdlctx.numbits >= 16) { 289 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { 290 clear_bit(0, &s->hdlctx.in_hdlc_tx); 291 return; 292 } 293 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); 294 s->hdlctx.bitbuf >>= 16; 295 s->hdlctx.numbits -= 16; 296 } 297 switch (s->hdlctx.tx_state) { 298 default: 299 clear_bit(0, &s->hdlctx.in_hdlc_tx); 300 return; 301 case 0: 302 case 1: 303 if (s->hdlctx.numflags) { 304 s->hdlctx.numflags--; 305 s->hdlctx.bitbuf |= 306 0x7e7e << s->hdlctx.numbits; 307 s->hdlctx.numbits += 16; 308 break; 309 } 310 if (s->hdlctx.tx_state == 1) { 311 clear_bit(0, &s->hdlctx.in_hdlc_tx); 312 return; 313 } 314 if (!(skb = s->skb)) { 315 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); 316 if (flgs < 2) 317 flgs = 2; 318 s->hdlctx.tx_state = 1; 319 s->hdlctx.numflags = flgs; 320 break; 321 } 322 s->skb = NULL; 323 netif_wake_queue(dev); 324 pkt_len = skb->len-1; /* strip KISS byte */ 325 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { 326 s->hdlctx.tx_state = 0; 327 s->hdlctx.numflags = 1; 328 dev_kfree_skb_irq(skb); 329 break; 330 } 331 memcpy(s->hdlctx.buffer, skb->data+1, pkt_len); 332 dev_kfree_skb_irq(skb); 333 s->hdlctx.bp = s->hdlctx.buffer; 334 append_crc_ccitt(s->hdlctx.buffer, pkt_len); 335 s->hdlctx.len = pkt_len+2; /* the appended CRC */ 336 s->hdlctx.tx_state = 2; 337 s->hdlctx.bitstream = 0; 338 s->stats.tx_packets++; 339 break; 340 case 2: 341 if (!s->hdlctx.len) { 342 s->hdlctx.tx_state = 0; 343 s->hdlctx.numflags = 1; 344 break; 345 } 346 s->hdlctx.len--; 347 s->hdlctx.bitbuf |= *s->hdlctx.bp << 348 s->hdlctx.numbits; 349 s->hdlctx.bitstream >>= 8; 350 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; 351 mask1 = 0x1f000; 352 mask2 = 0x10000; 353 mask3 = 0xffffffff >> (31-s->hdlctx.numbits); 354 s->hdlctx.numbits += 8; 355 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, 356 mask3 = (mask3 << 1) | 1) { 357 if ((s->hdlctx.bitstream & mask1) != mask1) 358 continue; 359 s->hdlctx.bitstream &= ~mask2; 360 s->hdlctx.bitbuf = 361 (s->hdlctx.bitbuf & mask3) | 362 ((s->hdlctx.bitbuf & 363 (~mask3)) << 1); 364 s->hdlctx.numbits++; 365 mask3 = (mask3 << 1) | 1; 366 } 367 break; 368 } 369 } 370 } 371 372 /* ---------------------------------------------------------------------- */ 373 374 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) 375 { 376 s->hdlctx.tx_state = 0; 377 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); 378 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; 379 hdlcdrv_transmitter(dev, s); 380 s->hdlctx.ptt = 1; 381 s->ptt_keyed++; 382 } 383 384 /* ---------------------------------------------------------------------- */ 385 386 static unsigned short random_seed; 387 388 static inline unsigned short random_num(void) 389 { 390 random_seed = 28629 * random_seed + 157; 391 return random_seed; 392 } 393 394 /* ---------------------------------------------------------------------- */ 395 396 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) 397 { 398 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 399 return; 400 if (s->ch_params.fulldup) { 401 start_tx(dev, s); 402 return; 403 } 404 if (s->hdlcrx.dcd) { 405 s->hdlctx.slotcnt = s->ch_params.slottime; 406 return; 407 } 408 if ((--s->hdlctx.slotcnt) > 0) 409 return; 410 s->hdlctx.slotcnt = s->ch_params.slottime; 411 if ((random_num() % 256) > s->ch_params.ppersist) 412 return; 413 start_tx(dev, s); 414 } 415 416 /* --------------------------------------------------------------------- */ 417 /* 418 * ===================== network driver interface ========================= 419 */ 420 421 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev) 422 { 423 struct hdlcdrv_state *sm = netdev_priv(dev); 424 425 if (skb->data[0] != 0) { 426 do_kiss_params(sm, skb->data, skb->len); 427 dev_kfree_skb(skb); 428 return 0; 429 } 430 if (sm->skb) 431 return -1; 432 netif_stop_queue(dev); 433 sm->skb = skb; 434 return 0; 435 } 436 437 /* --------------------------------------------------------------------- */ 438 439 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) 440 { 441 struct sockaddr *sa = (struct sockaddr *)addr; 442 443 /* addr is an AX.25 shifted ASCII mac address */ 444 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 445 return 0; 446 } 447 448 /* --------------------------------------------------------------------- */ 449 450 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev) 451 { 452 struct hdlcdrv_state *sm = netdev_priv(dev); 453 454 /* 455 * Get the current statistics. This may be called with the 456 * card open or closed. 457 */ 458 return &sm->stats; 459 } 460 461 /* --------------------------------------------------------------------- */ 462 /* 463 * Open/initialize the board. This is called (in the current kernel) 464 * sometime after booting when the 'ifconfig' program is run. 465 * 466 * This routine should set everything up anew at each open, even 467 * registers that "should" only need to be set once at boot, so that 468 * there is non-reboot way to recover if something goes wrong. 469 */ 470 471 static int hdlcdrv_open(struct net_device *dev) 472 { 473 struct hdlcdrv_state *s = netdev_priv(dev); 474 int i; 475 476 if (!s->ops || !s->ops->open) 477 return -ENODEV; 478 479 /* 480 * initialise some variables 481 */ 482 s->opened = 1; 483 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 484 s->hdlcrx.in_hdlc_rx = 0; 485 s->hdlcrx.rx_state = 0; 486 487 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 488 s->hdlctx.in_hdlc_tx = 0; 489 s->hdlctx.tx_state = 1; 490 s->hdlctx.numflags = 0; 491 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 492 s->hdlctx.ptt = 0; 493 s->hdlctx.slotcnt = s->ch_params.slottime; 494 s->hdlctx.calibrate = 0; 495 496 i = s->ops->open(dev); 497 if (i) 498 return i; 499 netif_start_queue(dev); 500 return 0; 501 } 502 503 /* --------------------------------------------------------------------- */ 504 /* 505 * The inverse routine to hdlcdrv_open(). 506 */ 507 508 static int hdlcdrv_close(struct net_device *dev) 509 { 510 struct hdlcdrv_state *s = netdev_priv(dev); 511 int i = 0; 512 513 netif_stop_queue(dev); 514 515 if (s->ops && s->ops->close) 516 i = s->ops->close(dev); 517 if (s->skb) 518 dev_kfree_skb(s->skb); 519 s->skb = NULL; 520 s->opened = 0; 521 return i; 522 } 523 524 /* --------------------------------------------------------------------- */ 525 526 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 527 { 528 struct hdlcdrv_state *s = netdev_priv(dev); 529 struct hdlcdrv_ioctl bi; 530 531 if (cmd != SIOCDEVPRIVATE) { 532 if (s->ops && s->ops->ioctl) 533 return s->ops->ioctl(dev, ifr, &bi, cmd); 534 return -ENOIOCTLCMD; 535 } 536 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) 537 return -EFAULT; 538 539 switch (bi.cmd) { 540 default: 541 if (s->ops && s->ops->ioctl) 542 return s->ops->ioctl(dev, ifr, &bi, cmd); 543 return -ENOIOCTLCMD; 544 545 case HDLCDRVCTL_GETCHANNELPAR: 546 bi.data.cp.tx_delay = s->ch_params.tx_delay; 547 bi.data.cp.tx_tail = s->ch_params.tx_tail; 548 bi.data.cp.slottime = s->ch_params.slottime; 549 bi.data.cp.ppersist = s->ch_params.ppersist; 550 bi.data.cp.fulldup = s->ch_params.fulldup; 551 break; 552 553 case HDLCDRVCTL_SETCHANNELPAR: 554 if (!capable(CAP_NET_ADMIN)) 555 return -EACCES; 556 s->ch_params.tx_delay = bi.data.cp.tx_delay; 557 s->ch_params.tx_tail = bi.data.cp.tx_tail; 558 s->ch_params.slottime = bi.data.cp.slottime; 559 s->ch_params.ppersist = bi.data.cp.ppersist; 560 s->ch_params.fulldup = bi.data.cp.fulldup; 561 s->hdlctx.slotcnt = 1; 562 return 0; 563 564 case HDLCDRVCTL_GETMODEMPAR: 565 bi.data.mp.iobase = dev->base_addr; 566 bi.data.mp.irq = dev->irq; 567 bi.data.mp.dma = dev->dma; 568 bi.data.mp.dma2 = s->ptt_out.dma2; 569 bi.data.mp.seriobase = s->ptt_out.seriobase; 570 bi.data.mp.pariobase = s->ptt_out.pariobase; 571 bi.data.mp.midiiobase = s->ptt_out.midiiobase; 572 break; 573 574 case HDLCDRVCTL_SETMODEMPAR: 575 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) 576 return -EACCES; 577 dev->base_addr = bi.data.mp.iobase; 578 dev->irq = bi.data.mp.irq; 579 dev->dma = bi.data.mp.dma; 580 s->ptt_out.dma2 = bi.data.mp.dma2; 581 s->ptt_out.seriobase = bi.data.mp.seriobase; 582 s->ptt_out.pariobase = bi.data.mp.pariobase; 583 s->ptt_out.midiiobase = bi.data.mp.midiiobase; 584 return 0; 585 586 case HDLCDRVCTL_GETSTAT: 587 bi.data.cs.ptt = hdlcdrv_ptt(s); 588 bi.data.cs.dcd = s->hdlcrx.dcd; 589 bi.data.cs.ptt_keyed = s->ptt_keyed; 590 bi.data.cs.tx_packets = s->stats.tx_packets; 591 bi.data.cs.tx_errors = s->stats.tx_errors; 592 bi.data.cs.rx_packets = s->stats.rx_packets; 593 bi.data.cs.rx_errors = s->stats.rx_errors; 594 break; 595 596 case HDLCDRVCTL_OLDGETSTAT: 597 bi.data.ocs.ptt = hdlcdrv_ptt(s); 598 bi.data.ocs.dcd = s->hdlcrx.dcd; 599 bi.data.ocs.ptt_keyed = s->ptt_keyed; 600 break; 601 602 case HDLCDRVCTL_CALIBRATE: 603 if(!capable(CAP_SYS_RAWIO)) 604 return -EPERM; 605 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; 606 return 0; 607 608 case HDLCDRVCTL_GETSAMPLES: 609 #ifndef HDLCDRV_DEBUG 610 return -EPERM; 611 #else /* HDLCDRV_DEBUG */ 612 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) 613 return -EAGAIN; 614 bi.data.bits = 615 s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; 616 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % 617 sizeof(s->bitbuf_channel.buffer); 618 break; 619 #endif /* HDLCDRV_DEBUG */ 620 621 case HDLCDRVCTL_GETBITS: 622 #ifndef HDLCDRV_DEBUG 623 return -EPERM; 624 #else /* HDLCDRV_DEBUG */ 625 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) 626 return -EAGAIN; 627 bi.data.bits = 628 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; 629 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % 630 sizeof(s->bitbuf_hdlc.buffer); 631 break; 632 #endif /* HDLCDRV_DEBUG */ 633 634 case HDLCDRVCTL_DRIVERNAME: 635 if (s->ops && s->ops->drvname) { 636 strncpy(bi.data.drivername, s->ops->drvname, 637 sizeof(bi.data.drivername)); 638 break; 639 } 640 bi.data.drivername[0] = '\0'; 641 break; 642 643 } 644 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) 645 return -EFAULT; 646 return 0; 647 648 } 649 650 /* --------------------------------------------------------------------- */ 651 652 /* 653 * Initialize fields in hdlcdrv 654 */ 655 static void hdlcdrv_setup(struct net_device *dev) 656 { 657 static const struct hdlcdrv_channel_params dflt_ch_params = { 658 20, 2, 10, 40, 0 659 }; 660 struct hdlcdrv_state *s = netdev_priv(dev); 661 662 /* 663 * initialize the hdlcdrv_state struct 664 */ 665 s->ch_params = dflt_ch_params; 666 s->ptt_keyed = 0; 667 668 spin_lock_init(&s->hdlcrx.hbuf.lock); 669 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; 670 s->hdlcrx.in_hdlc_rx = 0; 671 s->hdlcrx.rx_state = 0; 672 673 spin_lock_init(&s->hdlctx.hbuf.lock); 674 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; 675 s->hdlctx.in_hdlc_tx = 0; 676 s->hdlctx.tx_state = 1; 677 s->hdlctx.numflags = 0; 678 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; 679 s->hdlctx.ptt = 0; 680 s->hdlctx.slotcnt = s->ch_params.slottime; 681 s->hdlctx.calibrate = 0; 682 683 #ifdef HDLCDRV_DEBUG 684 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; 685 s->bitbuf_channel.shreg = 0x80; 686 687 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; 688 s->bitbuf_hdlc.shreg = 0x80; 689 #endif /* HDLCDRV_DEBUG */ 690 691 /* 692 * initialize the device struct 693 */ 694 dev->open = hdlcdrv_open; 695 dev->stop = hdlcdrv_close; 696 dev->do_ioctl = hdlcdrv_ioctl; 697 dev->hard_start_xmit = hdlcdrv_send_packet; 698 dev->get_stats = hdlcdrv_get_stats; 699 700 /* Fill in the fields of the device structure */ 701 702 s->skb = NULL; 703 704 dev->hard_header = ax25_hard_header; 705 dev->rebuild_header = ax25_rebuild_header; 706 dev->set_mac_address = hdlcdrv_set_mac_address; 707 708 dev->type = ARPHRD_AX25; /* AF_AX25 device */ 709 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; 710 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ 711 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ 712 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN); 713 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN); 714 dev->tx_queue_len = 16; 715 } 716 717 /* --------------------------------------------------------------------- */ 718 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, 719 unsigned int privsize, const char *ifname, 720 unsigned int baseaddr, unsigned int irq, 721 unsigned int dma) 722 { 723 struct net_device *dev; 724 struct hdlcdrv_state *s; 725 int err; 726 727 BUG_ON(ops == NULL); 728 729 if (privsize < sizeof(struct hdlcdrv_state)) 730 privsize = sizeof(struct hdlcdrv_state); 731 732 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup); 733 if (!dev) 734 return ERR_PTR(-ENOMEM); 735 736 /* 737 * initialize part of the hdlcdrv_state struct 738 */ 739 s = netdev_priv(dev); 740 s->magic = HDLCDRV_MAGIC; 741 s->ops = ops; 742 dev->base_addr = baseaddr; 743 dev->irq = irq; 744 dev->dma = dma; 745 746 err = register_netdev(dev); 747 if (err < 0) { 748 printk(KERN_WARNING "hdlcdrv: cannot register net " 749 "device %s\n", dev->name); 750 free_netdev(dev); 751 dev = ERR_PTR(err); 752 } 753 return dev; 754 } 755 756 /* --------------------------------------------------------------------- */ 757 758 void hdlcdrv_unregister(struct net_device *dev) 759 { 760 struct hdlcdrv_state *s = netdev_priv(dev); 761 762 BUG_ON(s->magic != HDLCDRV_MAGIC); 763 764 if (s->opened && s->ops->close) 765 s->ops->close(dev); 766 unregister_netdev(dev); 767 768 free_netdev(dev); 769 } 770 771 /* --------------------------------------------------------------------- */ 772 773 EXPORT_SYMBOL(hdlcdrv_receiver); 774 EXPORT_SYMBOL(hdlcdrv_transmitter); 775 EXPORT_SYMBOL(hdlcdrv_arbitrate); 776 EXPORT_SYMBOL(hdlcdrv_register); 777 EXPORT_SYMBOL(hdlcdrv_unregister); 778 779 /* --------------------------------------------------------------------- */ 780 781 static int __init hdlcdrv_init_driver(void) 782 { 783 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); 784 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n"); 785 return 0; 786 } 787 788 /* --------------------------------------------------------------------- */ 789 790 static void __exit hdlcdrv_cleanup_driver(void) 791 { 792 printk(KERN_INFO "hdlcdrv: cleanup\n"); 793 } 794 795 /* --------------------------------------------------------------------- */ 796 797 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); 798 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); 799 MODULE_LICENSE("GPL"); 800 module_init(hdlcdrv_init_driver); 801 module_exit(hdlcdrv_cleanup_driver); 802 803 /* --------------------------------------------------------------------- */ 804