drivers/net/hamradio/hdlcdrv.c

   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/config.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 #include <asm/uaccess.h>
  56
  57 #include <linux/netdevice.h>
  58 #include <linux/if_arp.h>
  59 #include <linux/etherdevice.h>
  60 #include <linux/skbuff.h>
  61 #include <linux/hdlcdrv.h>
  62 /* prototypes for ax25_encapsulate and ax25_rebuild_header */
  63 #include <net/ax25.h>
  64
  65 /* make genksyms happy */
  66 #include <linux/ip.h>
  67 #include <linux/udp.h>
  68 #include <linux/tcp.h>
  69 #include <linux/crc-ccitt.h>
  70
  71 /* --------------------------------------------------------------------- */
  72
  73 /*
  74  * The name of the card. Is used for messages and in the requests for
  75  * io regions, irqs and dma channels
  76  */
  77
  78 static char ax25_bcast[AX25_ADDR_LEN] =
  79 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
  80 static char ax25_nocall[AX25_ADDR_LEN] =
  81 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
  82
  83 /* --------------------------------------------------------------------- */
  84
  85 #define KISS_VERBOSE
  86
  87 /* --------------------------------------------------------------------- */
  88
  89 #define PARAM_TXDELAY   1
  90 #define PARAM_PERSIST   2
  91 #define PARAM_SLOTTIME  3
  92 #define PARAM_TXTAIL    4
  93 #define PARAM_FULLDUP   5
  94 #define PARAM_HARDWARE  6
  95 #define PARAM_RETURN    255
  96
  97 /* --------------------------------------------------------------------- */
  98 /*
  99  * the CRC routines are stolen from WAMPES
 100  * by Dieter Deyke
 101  */
 102
 103
 104 /*---------------------------------------------------------------------------*/
 105
 106 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 107 {
 108         unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
 109         *buffer++ = crc;
 110         *buffer++ = crc >> 8;
 111 }
 112
 113 /*---------------------------------------------------------------------------*/
 114
 115 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 116 {
 117         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 118 }
 119
 120 /*---------------------------------------------------------------------------*/
 121
 122 #if 0
 123 static int calc_crc_ccitt(const unsigned char *buf, int cnt)
 124 {
 125         unsigned int crc = 0xffff;
 126
 127         for (; cnt > 0; cnt--)
 128                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
 129         crc ^= 0xffff;
 130         return (crc & 0xffff);
 131 }
 132 #endif
 133
 134 /* ---------------------------------------------------------------------- */
 135
 136 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
 137
 138 /* ---------------------------------------------------------------------- */
 139 /*
 140  * The HDLC routines
 141  */
 142
 143 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
 144                              int num)
 145 {
 146         int added = 0;
 147
 148         while (s->hdlcrx.rx_state && num >= 8) {
 149                 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
 150                         s->hdlcrx.rx_state = 0;
 151                         return 0;
 152                 }
 153                 *s->hdlcrx.bp++ = bits >> (32-num);
 154                 s->hdlcrx.len++;
 155                 num -= 8;
 156                 added += 8;
 157         }
 158         return added;
 159 }
 160
 161 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
 162 {
 163         struct sk_buff *skb;
 164         int pkt_len;
 165         unsigned char *cp;
 166
 167         if (s->hdlcrx.len < 4)
 168                 return;
 169         if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
 170                 return;
 171         pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
 172         if (!(skb = dev_alloc_skb(pkt_len))) {
 173                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 174                 s->stats.rx_dropped++;
 175                 return;
 176         }
 177         skb->dev = dev;
 178         cp = skb_put(skb, pkt_len);
 179         *cp++ = 0; /* KISS kludge */
 180         memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
 181         skb->protocol = htons(ETH_P_AX25);
 182         skb->mac.raw = skb->data;
 183         netif_rx(skb);
 184         dev->last_rx = jiffies;
 185         s->stats.rx_packets++;
 186 }
 187
 188 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
 189 {
 190         int i;
 191         unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
 192
 193         if (!s || s->magic != HDLCDRV_MAGIC)
 194                 return;
 195         if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
 196                 return;
 197
 198         while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
 199                 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
 200
 201 #ifdef HDLCDRV_DEBUG
 202                 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
 203 #endif /* HDLCDRV_DEBUG */
 204                 s->hdlcrx.bitstream >>= 16;
 205                 s->hdlcrx.bitstream |= word << 16;
 206                 s->hdlcrx.bitbuf >>= 16;
 207                 s->hdlcrx.bitbuf |= word << 16;
 208                 s->hdlcrx.numbits += 16;
 209                 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
 210                     mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
 211                     i >= 0;
 212                     i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
 213                     mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
 214                         if ((s->hdlcrx.bitstream & mask1) == mask1)
 215                                 s->hdlcrx.rx_state = 0; /* abort received */
 216                         else if ((s->hdlcrx.bitstream & mask2) == mask3) {
 217                                 /* flag received */
 218                                 if (s->hdlcrx.rx_state) {
 219                                         hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
 220                                                           << (8+i),
 221                                                           s->hdlcrx.numbits
 222                                                           -8-i);
 223                                         hdlc_rx_flag(dev, s);
 224                                 }
 225                                 s->hdlcrx.len = 0;
 226                                 s->hdlcrx.bp = s->hdlcrx.buffer;
 227                                 s->hdlcrx.rx_state = 1;
 228                                 s->hdlcrx.numbits = i;
 229                         } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
 230                                 /* stuffed bit */
 231                                 s->hdlcrx.numbits--;
 232                                 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
 233                                         ((s->hdlcrx.bitbuf & mask6) << 1);
 234                         }
 235                 }
 236                 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
 237                                                        s->hdlcrx.numbits);
 238         }
 239         clear_bit(0, &s->hdlcrx.in_hdlc_rx);
 240 }
 241
 242 /* ---------------------------------------------------------------------- */
 243
 244 static inline void do_kiss_params(struct hdlcdrv_state *s,
 245                                   unsigned char *data, unsigned long len)
 246 {
 247
 248 #ifdef KISS_VERBOSE
 249 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
 250 #else /* KISS_VERBOSE */
 251 #define PKP(a,b)
 252 #endif /* KISS_VERBOSE */
 253
 254         if (len < 2)
 255                 return;
 256         switch(data[0]) {
 257         case PARAM_TXDELAY:
 258                 s->ch_params.tx_delay = data[1];
 259                 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
 260                 break;
 261         case PARAM_PERSIST:
 262                 s->ch_params.ppersist = data[1];
 263                 PKP("p persistence = %u", s->ch_params.ppersist);
 264                 break;
 265         case PARAM_SLOTTIME:
 266                 s->ch_params.slottime = data[1];
 267                 PKP("slot time = %ums", s->ch_params.slottime);
 268                 break;
 269         case PARAM_TXTAIL:
 270                 s->ch_params.tx_tail = data[1];
 271                 PKP("TX tail = %ums", s->ch_params.tx_tail);
 272                 break;
 273         case PARAM_FULLDUP:
 274                 s->ch_params.fulldup = !!data[1];
 275                 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
 276                 break;
 277         default:
 278                 break;
 279         }
 280 #undef PKP
 281 }
 282
 283 /* ---------------------------------------------------------------------- */
 284
 285 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
 286 {
 287         unsigned int mask1, mask2, mask3;
 288         int i;
 289         struct sk_buff *skb;
 290         int pkt_len;
 291
 292         if (!s || s->magic != HDLCDRV_MAGIC)
 293                 return;
 294         if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
 295                 return;
 296         for (;;) {
 297                 if (s->hdlctx.numbits >= 16) {
 298                         if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
 299                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 300                                 return;
 301                         }
 302                         hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
 303                         s->hdlctx.bitbuf >>= 16;
 304                         s->hdlctx.numbits -= 16;
 305                 }
 306                 switch (s->hdlctx.tx_state) {
 307                 default:
 308                         clear_bit(0, &s->hdlctx.in_hdlc_tx);
 309                         return;
 310                 case 0:
 311                 case 1:
 312                         if (s->hdlctx.numflags) {
 313                                 s->hdlctx.numflags--;
 314                                 s->hdlctx.bitbuf |=
 315                                         0x7e7e << s->hdlctx.numbits;
 316                                 s->hdlctx.numbits += 16;
 317                                 break;
 318                         }
 319                         if (s->hdlctx.tx_state == 1) {
 320                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 321                                 return;
 322                         }
 323                         if (!(skb = s->skb)) {
 324                                 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
 325                                 if (flgs < 2)
 326                                         flgs = 2;
 327                                 s->hdlctx.tx_state = 1;
 328                                 s->hdlctx.numflags = flgs;
 329                                 break;
 330                         }
 331                         s->skb = NULL;
 332                         netif_wake_queue(dev);
 333                         pkt_len = skb->len-1; /* strip KISS byte */
 334                         if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
 335                                 s->hdlctx.tx_state = 0;
 336                                 s->hdlctx.numflags = 1;
 337                                 dev_kfree_skb_irq(skb);
 338                                 break;
 339                         }
 340                         memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
 341                         dev_kfree_skb_irq(skb);
 342                         s->hdlctx.bp = s->hdlctx.buffer;
 343                         append_crc_ccitt(s->hdlctx.buffer, pkt_len);
 344                         s->hdlctx.len = pkt_len+2; /* the appended CRC */
 345                         s->hdlctx.tx_state = 2;
 346                         s->hdlctx.bitstream = 0;
 347                         s->stats.tx_packets++;
 348                         break;
 349                 case 2:
 350                         if (!s->hdlctx.len) {
 351                                 s->hdlctx.tx_state = 0;
 352                                 s->hdlctx.numflags = 1;
 353                                 break;
 354                         }
 355                         s->hdlctx.len--;
 356                         s->hdlctx.bitbuf |= *s->hdlctx.bp <<
 357                                 s->hdlctx.numbits;
 358                         s->hdlctx.bitstream >>= 8;
 359                         s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
 360                         mask1 = 0x1f000;
 361                         mask2 = 0x10000;
 362                         mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
 363                         s->hdlctx.numbits += 8;
 364                         for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
 365                             mask3 = (mask3 << 1) | 1) {
 366                                 if ((s->hdlctx.bitstream & mask1) != mask1)
 367                                         continue;
 368                                 s->hdlctx.bitstream &= ~mask2;
 369                                 s->hdlctx.bitbuf =
 370                                         (s->hdlctx.bitbuf & mask3) |
 371                                                 ((s->hdlctx.bitbuf &
 372                                                  (~mask3)) << 1);
 373                                 s->hdlctx.numbits++;
 374                                 mask3 = (mask3 << 1) | 1;
 375                         }
 376                         break;
 377                 }
 378         }
 379 }
 380
 381 /* ---------------------------------------------------------------------- */
 382
 383 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
 384 {
 385         s->hdlctx.tx_state = 0;
 386         s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
 387         s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
 388         hdlcdrv_transmitter(dev, s);
 389         s->hdlctx.ptt = 1;
 390         s->ptt_keyed++;
 391 }
 392
 393 /* ---------------------------------------------------------------------- */
 394
 395 static unsigned short random_seed;
 396
 397 static inline unsigned short random_num(void)
 398 {
 399         random_seed = 28629 * random_seed + 157;
 400         return random_seed;
 401 }
 402
 403 /* ---------------------------------------------------------------------- */
 404
 405 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
 406 {
 407         if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
 408                 return;
 409         if (s->ch_params.fulldup) {
 410                 start_tx(dev, s);
 411                 return;
 412         }
 413         if (s->hdlcrx.dcd) {
 414                 s->hdlctx.slotcnt = s->ch_params.slottime;
 415                 return;
 416         }
 417         if ((--s->hdlctx.slotcnt) > 0)
 418                 return;
 419         s->hdlctx.slotcnt = s->ch_params.slottime;
 420         if ((random_num() % 256) > s->ch_params.ppersist)
 421                 return;
 422         start_tx(dev, s);
 423 }
 424
 425 /* --------------------------------------------------------------------- */
 426 /*
 427  * ===================== network driver interface =========================
 428  */
 429
 430 static inline int hdlcdrv_paranoia_check(struct net_device *dev,
 431                                         const char *routine)
 432 {
 433         if (!dev || !dev->priv ||
 434             ((struct hdlcdrv_state *)dev->priv)->magic != HDLCDRV_MAGIC) {
 435                 printk(KERN_ERR "hdlcdrv: bad magic number for hdlcdrv_state "
 436                        "struct in routine %s\n", routine);
 437                 return 1;
 438         }
 439         return 0;
 440 }
 441
 442 /* --------------------------------------------------------------------- */
 443
 444 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
 445 {
 446         struct hdlcdrv_state *sm;
 447
 448         if (hdlcdrv_paranoia_check(dev, "hdlcdrv_send_packet"))
 449                 return 0;
 450         sm = (struct hdlcdrv_state *)dev->priv;
 451         if (skb->data[0] != 0) {
 452                 do_kiss_params(sm, skb->data, skb->len);
 453                 dev_kfree_skb(skb);
 454                 return 0;
 455         }
 456         if (sm->skb)
 457                 return -1;
 458         netif_stop_queue(dev);
 459         sm->skb = skb;
 460         return 0;
 461 }
 462
 463 /* --------------------------------------------------------------------- */
 464
 465 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
 466 {
 467         struct sockaddr *sa = (struct sockaddr *)addr;
 468
 469         /* addr is an AX.25 shifted ASCII mac address */
 470         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 471         return 0;
 472 }
 473
 474 /* --------------------------------------------------------------------- */
 475
 476 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
 477 {
 478         struct hdlcdrv_state *sm;
 479
 480         if (hdlcdrv_paranoia_check(dev, "hdlcdrv_get_stats"))
 481                 return NULL;
 482         sm = (struct hdlcdrv_state *)dev->priv;
 483         /*
 484          * Get the current statistics.  This may be called with the
 485          * card open or closed.
 486          */
 487         return &sm->stats;
 488 }
 489
 490 /* --------------------------------------------------------------------- */
 491 /*
 492  * Open/initialize the board. This is called (in the current kernel)
 493  * sometime after booting when the 'ifconfig' program is run.
 494  *
 495  * This routine should set everything up anew at each open, even
 496  * registers that "should" only need to be set once at boot, so that
 497  * there is non-reboot way to recover if something goes wrong.
 498  */
 499
 500 static int hdlcdrv_open(struct net_device *dev)
 501 {
 502         struct hdlcdrv_state *s;
 503         int i;
 504
 505         if (hdlcdrv_paranoia_check(dev, "hdlcdrv_open"))
 506                 return -EINVAL;
 507         s = (struct hdlcdrv_state *)dev->priv;
 508
 509         if (!s->ops || !s->ops->open)
 510                 return -ENODEV;
 511
 512         /*
 513          * initialise some variables
 514          */
 515         s->opened = 1;
 516         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 517         s->hdlcrx.in_hdlc_rx = 0;
 518         s->hdlcrx.rx_state = 0;
 519
 520         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 521         s->hdlctx.in_hdlc_tx = 0;
 522         s->hdlctx.tx_state = 1;
 523         s->hdlctx.numflags = 0;
 524         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 525         s->hdlctx.ptt = 0;
 526         s->hdlctx.slotcnt = s->ch_params.slottime;
 527         s->hdlctx.calibrate = 0;
 528
 529         i = s->ops->open(dev);
 530         if (i)
 531                 return i;
 532         netif_start_queue(dev);
 533         return 0;
 534 }
 535
 536 /* --------------------------------------------------------------------- */
 537 /*
 538  * The inverse routine to hdlcdrv_open().
 539  */
 540
 541 static int hdlcdrv_close(struct net_device *dev)
 542 {
 543         struct hdlcdrv_state *s;
 544         int i = 0;
 545
 546         if (hdlcdrv_paranoia_check(dev, "hdlcdrv_close"))
 547                 return -EINVAL;
 548         s = (struct hdlcdrv_state *)dev->priv;
 549
 550         netif_stop_queue(dev);
 551
 552         if (s->ops && s->ops->close)
 553                 i = s->ops->close(dev);
 554         if (s->skb)
 555                 dev_kfree_skb(s->skb);
 556         s->skb = NULL;
 557         s->opened = 0;
 558         return i;
 559 }
 560
 561 /* --------------------------------------------------------------------- */
 562
 563 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 564 {
 565         struct hdlcdrv_state *s;
 566         struct hdlcdrv_ioctl bi;
 567
 568         if (hdlcdrv_paranoia_check(dev, "hdlcdrv_ioctl"))
 569                 return -EINVAL;
 570         s = (struct hdlcdrv_state *)dev->priv;
 571
 572         if (cmd != SIOCDEVPRIVATE) {
 573                 if (s->ops && s->ops->ioctl)
 574                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 575                 return -ENOIOCTLCMD;
 576         }
 577         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 578                 return -EFAULT;
 579
 580         switch (bi.cmd) {
 581         default:
 582                 if (s->ops && s->ops->ioctl)
 583                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 584                 return -ENOIOCTLCMD;
 585
 586         case HDLCDRVCTL_GETCHANNELPAR:
 587                 bi.data.cp.tx_delay = s->ch_params.tx_delay;
 588                 bi.data.cp.tx_tail = s->ch_params.tx_tail;
 589                 bi.data.cp.slottime = s->ch_params.slottime;
 590                 bi.data.cp.ppersist = s->ch_params.ppersist;
 591                 bi.data.cp.fulldup = s->ch_params.fulldup;
 592                 break;
 593
 594         case HDLCDRVCTL_SETCHANNELPAR:
 595                 if (!capable(CAP_NET_ADMIN))
 596                         return -EACCES;
 597                 s->ch_params.tx_delay = bi.data.cp.tx_delay;
 598                 s->ch_params.tx_tail = bi.data.cp.tx_tail;
 599                 s->ch_params.slottime = bi.data.cp.slottime;
 600                 s->ch_params.ppersist = bi.data.cp.ppersist;
 601                 s->ch_params.fulldup = bi.data.cp.fulldup;
 602                 s->hdlctx.slotcnt = 1;
 603                 return 0;
 604
 605         case HDLCDRVCTL_GETMODEMPAR:
 606                 bi.data.mp.iobase = dev->base_addr;
 607                 bi.data.mp.irq = dev->irq;
 608                 bi.data.mp.dma = dev->dma;
 609                 bi.data.mp.dma2 = s->ptt_out.dma2;
 610                 bi.data.mp.seriobase = s->ptt_out.seriobase;
 611                 bi.data.mp.pariobase = s->ptt_out.pariobase;
 612                 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
 613                 break;
 614
 615         case HDLCDRVCTL_SETMODEMPAR:
 616                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
 617                         return -EACCES;
 618                 dev->base_addr = bi.data.mp.iobase;
 619                 dev->irq = bi.data.mp.irq;
 620                 dev->dma = bi.data.mp.dma;
 621                 s->ptt_out.dma2 = bi.data.mp.dma2;
 622                 s->ptt_out.seriobase = bi.data.mp.seriobase;
 623                 s->ptt_out.pariobase = bi.data.mp.pariobase;
 624                 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
 625                 return 0;
 626
 627         case HDLCDRVCTL_GETSTAT:
 628                 bi.data.cs.ptt = hdlcdrv_ptt(s);
 629                 bi.data.cs.dcd = s->hdlcrx.dcd;
 630                 bi.data.cs.ptt_keyed = s->ptt_keyed;
 631                 bi.data.cs.tx_packets = s->stats.tx_packets;
 632                 bi.data.cs.tx_errors = s->stats.tx_errors;
 633                 bi.data.cs.rx_packets = s->stats.rx_packets;
 634                 bi.data.cs.rx_errors = s->stats.rx_errors;
 635                 break;
 636
 637         case HDLCDRVCTL_OLDGETSTAT:
 638                 bi.data.ocs.ptt = hdlcdrv_ptt(s);
 639                 bi.data.ocs.dcd = s->hdlcrx.dcd;
 640                 bi.data.ocs.ptt_keyed = s->ptt_keyed;
 641                 break;
 642
 643         case HDLCDRVCTL_CALIBRATE:
 644                 if(!capable(CAP_SYS_RAWIO))
 645                         return -EPERM;
 646                 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
 647                 return 0;
 648
 649         case HDLCDRVCTL_GETSAMPLES:
 650 #ifndef HDLCDRV_DEBUG
 651                 return -EPERM;
 652 #else /* HDLCDRV_DEBUG */
 653                 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
 654                         return -EAGAIN;
 655                 bi.data.bits =
 656                         s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
 657                 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
 658                         sizeof(s->bitbuf_channel.buffer);
 659                 break;
 660 #endif /* HDLCDRV_DEBUG */
 661
 662         case HDLCDRVCTL_GETBITS:
 663 #ifndef HDLCDRV_DEBUG
 664                 return -EPERM;
 665 #else /* HDLCDRV_DEBUG */
 666                 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
 667                         return -EAGAIN;
 668                 bi.data.bits =
 669                         s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
 670                 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
 671                         sizeof(s->bitbuf_hdlc.buffer);
 672                 break;
 673 #endif /* HDLCDRV_DEBUG */
 674
 675         case HDLCDRVCTL_DRIVERNAME:
 676                 if (s->ops && s->ops->drvname) {
 677                         strncpy(bi.data.drivername, s->ops->drvname,
 678                                 sizeof(bi.data.drivername));
 679                         break;
 680                 }
 681                 bi.data.drivername[0] = '\0';
 682                 break;
 683
 684         }
 685         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 686                 return -EFAULT;
 687         return 0;
 688
 689 }
 690
 691 /* --------------------------------------------------------------------- */
 692
 693 /*
 694  * Initialize fields in hdlcdrv
 695  */
 696 static void hdlcdrv_setup(struct net_device *dev)
 697 {
 698         static const struct hdlcdrv_channel_params dflt_ch_params = {
 699                 20, 2, 10, 40, 0
 700         };
 701         struct hdlcdrv_state *s = dev->priv;
 702
 703         /*
 704          * initialize the hdlcdrv_state struct
 705          */
 706         s->ch_params = dflt_ch_params;
 707         s->ptt_keyed = 0;
 708
 709         spin_lock_init(&s->hdlcrx.hbuf.lock);
 710         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 711         s->hdlcrx.in_hdlc_rx = 0;
 712         s->hdlcrx.rx_state = 0;
 713
 714         spin_lock_init(&s->hdlctx.hbuf.lock);
 715         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 716         s->hdlctx.in_hdlc_tx = 0;
 717         s->hdlctx.tx_state = 1;
 718         s->hdlctx.numflags = 0;
 719         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 720         s->hdlctx.ptt = 0;
 721         s->hdlctx.slotcnt = s->ch_params.slottime;
 722         s->hdlctx.calibrate = 0;
 723
 724 #ifdef HDLCDRV_DEBUG
 725         s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
 726         s->bitbuf_channel.shreg = 0x80;
 727
 728         s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
 729         s->bitbuf_hdlc.shreg = 0x80;
 730 #endif /* HDLCDRV_DEBUG */
 731
 732         /*
 733          * initialize the device struct
 734          */
 735         dev->open = hdlcdrv_open;
 736         dev->stop = hdlcdrv_close;
 737         dev->do_ioctl = hdlcdrv_ioctl;
 738         dev->hard_start_xmit = hdlcdrv_send_packet;
 739         dev->get_stats = hdlcdrv_get_stats;
 740
 741         /* Fill in the fields of the device structure */
 742
 743         s->skb = NULL;
 744
 745 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 746         dev->hard_header = ax25_encapsulate;
 747         dev->rebuild_header = ax25_rebuild_header;
 748 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 749         dev->hard_header = NULL;
 750         dev->rebuild_header = NULL;
 751 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 752         dev->set_mac_address = hdlcdrv_set_mac_address;
 753
 754         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
 755         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 756         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 757         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
 758         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
 759         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
 760         dev->tx_queue_len = 16;
 761 }
 762
 763 /* --------------------------------------------------------------------- */
 764 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 765                                     unsigned int privsize, const char *ifname,
 766                                     unsigned int baseaddr, unsigned int irq,
 767                                     unsigned int dma)
 768 {
 769         struct net_device *dev;
 770         struct hdlcdrv_state *s;
 771         int err;
 772
 773         BUG_ON(ops == NULL);
 774
 775         if (privsize < sizeof(struct hdlcdrv_state))
 776                 privsize = sizeof(struct hdlcdrv_state);
 777
 778         dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
 779         if (!dev)
 780                 return ERR_PTR(-ENOMEM);
 781
 782         /*
 783          * initialize part of the hdlcdrv_state struct
 784          */
 785         s = dev->priv;
 786         s->magic = HDLCDRV_MAGIC;
 787         s->ops = ops;
 788         dev->base_addr = baseaddr;
 789         dev->irq = irq;
 790         dev->dma = dma;
 791
 792         err = register_netdev(dev);
 793         if (err < 0) {
 794                 printk(KERN_WARNING "hdlcdrv: cannot register net "
 795                        "device %s\n", dev->name);
 796                 free_netdev(dev);
 797                 dev = ERR_PTR(err);
 798         }
 799         return dev;
 800 }
 801
 802 /* --------------------------------------------------------------------- */
 803
 804 void hdlcdrv_unregister(struct net_device *dev)
 805 {
 806         struct hdlcdrv_state *s = dev->priv;
 807
 808         BUG_ON(s->magic != HDLCDRV_MAGIC);
 809
 810         if (s->opened && s->ops->close)
 811                 s->ops->close(dev);
 812         unregister_netdev(dev);
 813
 814         free_netdev(dev);
 815 }
 816
 817 /* --------------------------------------------------------------------- */
 818
 819 EXPORT_SYMBOL(hdlcdrv_receiver);
 820 EXPORT_SYMBOL(hdlcdrv_transmitter);
 821 EXPORT_SYMBOL(hdlcdrv_arbitrate);
 822 EXPORT_SYMBOL(hdlcdrv_register);
 823 EXPORT_SYMBOL(hdlcdrv_unregister);
 824
 825 /* --------------------------------------------------------------------- */
 826
 827 static int __init hdlcdrv_init_driver(void)
 828 {
 829         printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
 830         printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
 831         return 0;
 832 }
 833
 834 /* --------------------------------------------------------------------- */
 835
 836 static void __exit hdlcdrv_cleanup_driver(void)
 837 {
 838         printk(KERN_INFO "hdlcdrv: cleanup\n");
 839 }
 840
 841 /* --------------------------------------------------------------------- */
 842
 843 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 844 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
 845 MODULE_LICENSE("GPL");
 846 module_init(hdlcdrv_init_driver);
 847 module_exit(hdlcdrv_cleanup_driver);
 848
 849 /* --------------------------------------------------------------------- */