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         cp = skb_put(skb, pkt_len);
 178         *cp++ = 0; /* KISS kludge */
 179         memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
 180         skb->protocol = ax25_type_trans(skb, dev);
 181         netif_rx(skb);
 182         dev->last_rx = jiffies;
 183         s->stats.rx_packets++;
 184 }
 185
 186 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
 187 {
 188         int i;
 189         unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
 190
 191         if (!s || s->magic != HDLCDRV_MAGIC)
 192                 return;
 193         if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
 194                 return;
 195
 196         while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
 197                 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
 198
 199 #ifdef HDLCDRV_DEBUG
 200                 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
 201 #endif /* HDLCDRV_DEBUG */
 202                 s->hdlcrx.bitstream >>= 16;
 203                 s->hdlcrx.bitstream |= word << 16;
 204                 s->hdlcrx.bitbuf >>= 16;
 205                 s->hdlcrx.bitbuf |= word << 16;
 206                 s->hdlcrx.numbits += 16;
 207                 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
 208                     mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
 209                     i >= 0;
 210                     i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
 211                     mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
 212                         if ((s->hdlcrx.bitstream & mask1) == mask1)
 213                                 s->hdlcrx.rx_state = 0; /* abort received */
 214                         else if ((s->hdlcrx.bitstream & mask2) == mask3) {
 215                                 /* flag received */
 216                                 if (s->hdlcrx.rx_state) {
 217                                         hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
 218                                                           << (8+i),
 219                                                           s->hdlcrx.numbits
 220                                                           -8-i);
 221                                         hdlc_rx_flag(dev, s);
 222                                 }
 223                                 s->hdlcrx.len = 0;
 224                                 s->hdlcrx.bp = s->hdlcrx.buffer;
 225                                 s->hdlcrx.rx_state = 1;
 226                                 s->hdlcrx.numbits = i;
 227                         } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
 228                                 /* stuffed bit */
 229                                 s->hdlcrx.numbits--;
 230                                 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
 231                                         ((s->hdlcrx.bitbuf & mask6) << 1);
 232                         }
 233                 }
 234                 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
 235                                                        s->hdlcrx.numbits);
 236         }
 237         clear_bit(0, &s->hdlcrx.in_hdlc_rx);
 238 }
 239
 240 /* ---------------------------------------------------------------------- */
 241
 242 static inline void do_kiss_params(struct hdlcdrv_state *s,
 243                                   unsigned char *data, unsigned long len)
 244 {
 245
 246 #ifdef KISS_VERBOSE
 247 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
 248 #else /* KISS_VERBOSE */
 249 #define PKP(a,b)
 250 #endif /* KISS_VERBOSE */
 251
 252         if (len < 2)
 253                 return;
 254         switch(data[0]) {
 255         case PARAM_TXDELAY:
 256                 s->ch_params.tx_delay = data[1];
 257                 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
 258                 break;
 259         case PARAM_PERSIST:
 260                 s->ch_params.ppersist = data[1];
 261                 PKP("p persistence = %u", s->ch_params.ppersist);
 262                 break;
 263         case PARAM_SLOTTIME:
 264                 s->ch_params.slottime = data[1];
 265                 PKP("slot time = %ums", s->ch_params.slottime);
 266                 break;
 267         case PARAM_TXTAIL:
 268                 s->ch_params.tx_tail = data[1];
 269                 PKP("TX tail = %ums", s->ch_params.tx_tail);
 270                 break;
 271         case PARAM_FULLDUP:
 272                 s->ch_params.fulldup = !!data[1];
 273                 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
 274                 break;
 275         default:
 276                 break;
 277         }
 278 #undef PKP
 279 }
 280
 281 /* ---------------------------------------------------------------------- */
 282
 283 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
 284 {
 285         unsigned int mask1, mask2, mask3;
 286         int i;
 287         struct sk_buff *skb;
 288         int pkt_len;
 289
 290         if (!s || s->magic != HDLCDRV_MAGIC)
 291                 return;
 292         if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
 293                 return;
 294         for (;;) {
 295                 if (s->hdlctx.numbits >= 16) {
 296                         if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
 297                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 298                                 return;
 299                         }
 300                         hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
 301                         s->hdlctx.bitbuf >>= 16;
 302                         s->hdlctx.numbits -= 16;
 303                 }
 304                 switch (s->hdlctx.tx_state) {
 305                 default:
 306                         clear_bit(0, &s->hdlctx.in_hdlc_tx);
 307                         return;
 308                 case 0:
 309                 case 1:
 310                         if (s->hdlctx.numflags) {
 311                                 s->hdlctx.numflags--;
 312                                 s->hdlctx.bitbuf |=
 313                                         0x7e7e << s->hdlctx.numbits;
 314                                 s->hdlctx.numbits += 16;
 315                                 break;
 316                         }
 317                         if (s->hdlctx.tx_state == 1) {
 318                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 319                                 return;
 320                         }
 321                         if (!(skb = s->skb)) {
 322                                 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
 323                                 if (flgs < 2)
 324                                         flgs = 2;
 325                                 s->hdlctx.tx_state = 1;
 326                                 s->hdlctx.numflags = flgs;
 327                                 break;
 328                         }
 329                         s->skb = NULL;
 330                         netif_wake_queue(dev);
 331                         pkt_len = skb->len-1; /* strip KISS byte */
 332                         if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
 333                                 s->hdlctx.tx_state = 0;
 334                                 s->hdlctx.numflags = 1;
 335                                 dev_kfree_skb_irq(skb);
 336                                 break;
 337                         }
 338                         memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
 339                         dev_kfree_skb_irq(skb);
 340                         s->hdlctx.bp = s->hdlctx.buffer;
 341                         append_crc_ccitt(s->hdlctx.buffer, pkt_len);
 342                         s->hdlctx.len = pkt_len+2; /* the appended CRC */
 343                         s->hdlctx.tx_state = 2;
 344                         s->hdlctx.bitstream = 0;
 345                         s->stats.tx_packets++;
 346                         break;
 347                 case 2:
 348                         if (!s->hdlctx.len) {
 349                                 s->hdlctx.tx_state = 0;
 350                                 s->hdlctx.numflags = 1;
 351                                 break;
 352                         }
 353                         s->hdlctx.len--;
 354                         s->hdlctx.bitbuf |= *s->hdlctx.bp <<
 355                                 s->hdlctx.numbits;
 356                         s->hdlctx.bitstream >>= 8;
 357                         s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
 358                         mask1 = 0x1f000;
 359                         mask2 = 0x10000;
 360                         mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
 361                         s->hdlctx.numbits += 8;
 362                         for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
 363                             mask3 = (mask3 << 1) | 1) {
 364                                 if ((s->hdlctx.bitstream & mask1) != mask1)
 365                                         continue;
 366                                 s->hdlctx.bitstream &= ~mask2;
 367                                 s->hdlctx.bitbuf =
 368                                         (s->hdlctx.bitbuf & mask3) |
 369                                                 ((s->hdlctx.bitbuf &
 370                                                  (~mask3)) << 1);
 371                                 s->hdlctx.numbits++;
 372                                 mask3 = (mask3 << 1) | 1;
 373                         }
 374                         break;
 375                 }
 376         }
 377 }
 378
 379 /* ---------------------------------------------------------------------- */
 380
 381 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
 382 {
 383         s->hdlctx.tx_state = 0;
 384         s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
 385         s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
 386         hdlcdrv_transmitter(dev, s);
 387         s->hdlctx.ptt = 1;
 388         s->ptt_keyed++;
 389 }
 390
 391 /* ---------------------------------------------------------------------- */
 392
 393 static unsigned short random_seed;
 394
 395 static inline unsigned short random_num(void)
 396 {
 397         random_seed = 28629 * random_seed + 157;
 398         return random_seed;
 399 }
 400
 401 /* ---------------------------------------------------------------------- */
 402
 403 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
 404 {
 405         if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
 406                 return;
 407         if (s->ch_params.fulldup) {
 408                 start_tx(dev, s);
 409                 return;
 410         }
 411         if (s->hdlcrx.dcd) {
 412                 s->hdlctx.slotcnt = s->ch_params.slottime;
 413                 return;
 414         }
 415         if ((--s->hdlctx.slotcnt) > 0)
 416                 return;
 417         s->hdlctx.slotcnt = s->ch_params.slottime;
 418         if ((random_num() % 256) > s->ch_params.ppersist)
 419                 return;
 420         start_tx(dev, s);
 421 }
 422
 423 /* --------------------------------------------------------------------- */
 424 /*
 425  * ===================== network driver interface =========================
 426  */
 427
 428 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
 429 {
 430         struct hdlcdrv_state *sm = netdev_priv(dev);
 431
 432         if (skb->data[0] != 0) {
 433                 do_kiss_params(sm, skb->data, skb->len);
 434                 dev_kfree_skb(skb);
 435                 return 0;
 436         }
 437         if (sm->skb)
 438                 return -1;
 439         netif_stop_queue(dev);
 440         sm->skb = skb;
 441         return 0;
 442 }
 443
 444 /* --------------------------------------------------------------------- */
 445
 446 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
 447 {
 448         struct sockaddr *sa = (struct sockaddr *)addr;
 449
 450         /* addr is an AX.25 shifted ASCII mac address */
 451         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 452         return 0;
 453 }
 454
 455 /* --------------------------------------------------------------------- */
 456
 457 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
 458 {
 459         struct hdlcdrv_state *sm = netdev_priv(dev);
 460
 461         /*
 462          * Get the current statistics.  This may be called with the
 463          * card open or closed.
 464          */
 465         return &sm->stats;
 466 }
 467
 468 /* --------------------------------------------------------------------- */
 469 /*
 470  * Open/initialize the board. This is called (in the current kernel)
 471  * sometime after booting when the 'ifconfig' program is run.
 472  *
 473  * This routine should set everything up anew at each open, even
 474  * registers that "should" only need to be set once at boot, so that
 475  * there is non-reboot way to recover if something goes wrong.
 476  */
 477
 478 static int hdlcdrv_open(struct net_device *dev)
 479 {
 480         struct hdlcdrv_state *s = netdev_priv(dev);
 481         int i;
 482
 483         if (!s->ops || !s->ops->open)
 484                 return -ENODEV;
 485
 486         /*
 487          * initialise some variables
 488          */
 489         s->opened = 1;
 490         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 491         s->hdlcrx.in_hdlc_rx = 0;
 492         s->hdlcrx.rx_state = 0;
 493
 494         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 495         s->hdlctx.in_hdlc_tx = 0;
 496         s->hdlctx.tx_state = 1;
 497         s->hdlctx.numflags = 0;
 498         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 499         s->hdlctx.ptt = 0;
 500         s->hdlctx.slotcnt = s->ch_params.slottime;
 501         s->hdlctx.calibrate = 0;
 502
 503         i = s->ops->open(dev);
 504         if (i)
 505                 return i;
 506         netif_start_queue(dev);
 507         return 0;
 508 }
 509
 510 /* --------------------------------------------------------------------- */
 511 /*
 512  * The inverse routine to hdlcdrv_open().
 513  */
 514
 515 static int hdlcdrv_close(struct net_device *dev)
 516 {
 517         struct hdlcdrv_state *s = netdev_priv(dev);
 518         int i = 0;
 519
 520         netif_stop_queue(dev);
 521
 522         if (s->ops && s->ops->close)
 523                 i = s->ops->close(dev);
 524         if (s->skb)
 525                 dev_kfree_skb(s->skb);
 526         s->skb = NULL;
 527         s->opened = 0;
 528         return i;
 529 }
 530
 531 /* --------------------------------------------------------------------- */
 532
 533 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 534 {
 535         struct hdlcdrv_state *s = netdev_priv(dev);
 536         struct hdlcdrv_ioctl bi;
 537
 538         if (cmd != SIOCDEVPRIVATE) {
 539                 if (s->ops && s->ops->ioctl)
 540                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 541                 return -ENOIOCTLCMD;
 542         }
 543         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 544                 return -EFAULT;
 545
 546         switch (bi.cmd) {
 547         default:
 548                 if (s->ops && s->ops->ioctl)
 549                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 550                 return -ENOIOCTLCMD;
 551
 552         case HDLCDRVCTL_GETCHANNELPAR:
 553                 bi.data.cp.tx_delay = s->ch_params.tx_delay;
 554                 bi.data.cp.tx_tail = s->ch_params.tx_tail;
 555                 bi.data.cp.slottime = s->ch_params.slottime;
 556                 bi.data.cp.ppersist = s->ch_params.ppersist;
 557                 bi.data.cp.fulldup = s->ch_params.fulldup;
 558                 break;
 559
 560         case HDLCDRVCTL_SETCHANNELPAR:
 561                 if (!capable(CAP_NET_ADMIN))
 562                         return -EACCES;
 563                 s->ch_params.tx_delay = bi.data.cp.tx_delay;
 564                 s->ch_params.tx_tail = bi.data.cp.tx_tail;
 565                 s->ch_params.slottime = bi.data.cp.slottime;
 566                 s->ch_params.ppersist = bi.data.cp.ppersist;
 567                 s->ch_params.fulldup = bi.data.cp.fulldup;
 568                 s->hdlctx.slotcnt = 1;
 569                 return 0;
 570
 571         case HDLCDRVCTL_GETMODEMPAR:
 572                 bi.data.mp.iobase = dev->base_addr;
 573                 bi.data.mp.irq = dev->irq;
 574                 bi.data.mp.dma = dev->dma;
 575                 bi.data.mp.dma2 = s->ptt_out.dma2;
 576                 bi.data.mp.seriobase = s->ptt_out.seriobase;
 577                 bi.data.mp.pariobase = s->ptt_out.pariobase;
 578                 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
 579                 break;
 580
 581         case HDLCDRVCTL_SETMODEMPAR:
 582                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
 583                         return -EACCES;
 584                 dev->base_addr = bi.data.mp.iobase;
 585                 dev->irq = bi.data.mp.irq;
 586                 dev->dma = bi.data.mp.dma;
 587                 s->ptt_out.dma2 = bi.data.mp.dma2;
 588                 s->ptt_out.seriobase = bi.data.mp.seriobase;
 589                 s->ptt_out.pariobase = bi.data.mp.pariobase;
 590                 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
 591                 return 0;
 592
 593         case HDLCDRVCTL_GETSTAT:
 594                 bi.data.cs.ptt = hdlcdrv_ptt(s);
 595                 bi.data.cs.dcd = s->hdlcrx.dcd;
 596                 bi.data.cs.ptt_keyed = s->ptt_keyed;
 597                 bi.data.cs.tx_packets = s->stats.tx_packets;
 598                 bi.data.cs.tx_errors = s->stats.tx_errors;
 599                 bi.data.cs.rx_packets = s->stats.rx_packets;
 600                 bi.data.cs.rx_errors = s->stats.rx_errors;
 601                 break;
 602
 603         case HDLCDRVCTL_OLDGETSTAT:
 604                 bi.data.ocs.ptt = hdlcdrv_ptt(s);
 605                 bi.data.ocs.dcd = s->hdlcrx.dcd;
 606                 bi.data.ocs.ptt_keyed = s->ptt_keyed;
 607                 break;
 608
 609         case HDLCDRVCTL_CALIBRATE:
 610                 if(!capable(CAP_SYS_RAWIO))
 611                         return -EPERM;
 612                 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
 613                 return 0;
 614
 615         case HDLCDRVCTL_GETSAMPLES:
 616 #ifndef HDLCDRV_DEBUG
 617                 return -EPERM;
 618 #else /* HDLCDRV_DEBUG */
 619                 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
 620                         return -EAGAIN;
 621                 bi.data.bits =
 622                         s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
 623                 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
 624                         sizeof(s->bitbuf_channel.buffer);
 625                 break;
 626 #endif /* HDLCDRV_DEBUG */
 627
 628         case HDLCDRVCTL_GETBITS:
 629 #ifndef HDLCDRV_DEBUG
 630                 return -EPERM;
 631 #else /* HDLCDRV_DEBUG */
 632                 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
 633                         return -EAGAIN;
 634                 bi.data.bits =
 635                         s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
 636                 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
 637                         sizeof(s->bitbuf_hdlc.buffer);
 638                 break;
 639 #endif /* HDLCDRV_DEBUG */
 640
 641         case HDLCDRVCTL_DRIVERNAME:
 642                 if (s->ops && s->ops->drvname) {
 643                         strncpy(bi.data.drivername, s->ops->drvname,
 644                                 sizeof(bi.data.drivername));
 645                         break;
 646                 }
 647                 bi.data.drivername[0] = '\0';
 648                 break;
 649
 650         }
 651         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 652                 return -EFAULT;
 653         return 0;
 654
 655 }
 656
 657 /* --------------------------------------------------------------------- */
 658
 659 /*
 660  * Initialize fields in hdlcdrv
 661  */
 662 static void hdlcdrv_setup(struct net_device *dev)
 663 {
 664         static const struct hdlcdrv_channel_params dflt_ch_params = {
 665                 20, 2, 10, 40, 0
 666         };
 667         struct hdlcdrv_state *s = netdev_priv(dev);
 668
 669         /*
 670          * initialize the hdlcdrv_state struct
 671          */
 672         s->ch_params = dflt_ch_params;
 673         s->ptt_keyed = 0;
 674
 675         spin_lock_init(&s->hdlcrx.hbuf.lock);
 676         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 677         s->hdlcrx.in_hdlc_rx = 0;
 678         s->hdlcrx.rx_state = 0;
 679
 680         spin_lock_init(&s->hdlctx.hbuf.lock);
 681         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 682         s->hdlctx.in_hdlc_tx = 0;
 683         s->hdlctx.tx_state = 1;
 684         s->hdlctx.numflags = 0;
 685         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 686         s->hdlctx.ptt = 0;
 687         s->hdlctx.slotcnt = s->ch_params.slottime;
 688         s->hdlctx.calibrate = 0;
 689
 690 #ifdef HDLCDRV_DEBUG
 691         s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
 692         s->bitbuf_channel.shreg = 0x80;
 693
 694         s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
 695         s->bitbuf_hdlc.shreg = 0x80;
 696 #endif /* HDLCDRV_DEBUG */
 697
 698         /*
 699          * initialize the device struct
 700          */
 701         dev->open = hdlcdrv_open;
 702         dev->stop = hdlcdrv_close;
 703         dev->do_ioctl = hdlcdrv_ioctl;
 704         dev->hard_start_xmit = hdlcdrv_send_packet;
 705         dev->get_stats = hdlcdrv_get_stats;
 706
 707         /* Fill in the fields of the device structure */
 708
 709         s->skb = NULL;
 710
 711 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 712         dev->hard_header = ax25_encapsulate;
 713         dev->rebuild_header = ax25_rebuild_header;
 714 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 715         dev->hard_header = NULL;
 716         dev->rebuild_header = NULL;
 717 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 718         dev->set_mac_address = hdlcdrv_set_mac_address;
 719
 720         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
 721         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 722         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 723         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
 724         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
 725         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
 726         dev->tx_queue_len = 16;
 727 }
 728
 729 /* --------------------------------------------------------------------- */
 730 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 731                                     unsigned int privsize, const char *ifname,
 732                                     unsigned int baseaddr, unsigned int irq,
 733                                     unsigned int dma)
 734 {
 735         struct net_device *dev;
 736         struct hdlcdrv_state *s;
 737         int err;
 738
 739         BUG_ON(ops == NULL);
 740
 741         if (privsize < sizeof(struct hdlcdrv_state))
 742                 privsize = sizeof(struct hdlcdrv_state);
 743
 744         dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
 745         if (!dev)
 746                 return ERR_PTR(-ENOMEM);
 747
 748         /*
 749          * initialize part of the hdlcdrv_state struct
 750          */
 751         s = netdev_priv(dev);
 752         s->magic = HDLCDRV_MAGIC;
 753         s->ops = ops;
 754         dev->base_addr = baseaddr;
 755         dev->irq = irq;
 756         dev->dma = dma;
 757
 758         err = register_netdev(dev);
 759         if (err < 0) {
 760                 printk(KERN_WARNING "hdlcdrv: cannot register net "
 761                        "device %s\n", dev->name);
 762                 free_netdev(dev);
 763                 dev = ERR_PTR(err);
 764         }
 765         return dev;
 766 }
 767
 768 /* --------------------------------------------------------------------- */
 769
 770 void hdlcdrv_unregister(struct net_device *dev)
 771 {
 772         struct hdlcdrv_state *s = netdev_priv(dev);
 773
 774         BUG_ON(s->magic != HDLCDRV_MAGIC);
 775
 776         if (s->opened && s->ops->close)
 777                 s->ops->close(dev);
 778         unregister_netdev(dev);
 779
 780         free_netdev(dev);
 781 }
 782
 783 /* --------------------------------------------------------------------- */
 784
 785 EXPORT_SYMBOL(hdlcdrv_receiver);
 786 EXPORT_SYMBOL(hdlcdrv_transmitter);
 787 EXPORT_SYMBOL(hdlcdrv_arbitrate);
 788 EXPORT_SYMBOL(hdlcdrv_register);
 789 EXPORT_SYMBOL(hdlcdrv_unregister);
 790
 791 /* --------------------------------------------------------------------- */
 792
 793 static int __init hdlcdrv_init_driver(void)
 794 {
 795         printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
 796         printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
 797         return 0;
 798 }
 799
 800 /* --------------------------------------------------------------------- */
 801
 802 static void __exit hdlcdrv_cleanup_driver(void)
 803 {
 804         printk(KERN_INFO "hdlcdrv: cleanup\n");
 805 }
 806
 807 /* --------------------------------------------------------------------- */
 808
 809 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 810 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
 811 MODULE_LICENSE("GPL");
 812 module_init(hdlcdrv_init_driver);
 813 module_exit(hdlcdrv_cleanup_driver);
 814
 815 /* --------------------------------------------------------------------- */