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 int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
 431 {
 432         struct hdlcdrv_state *sm = netdev_priv(dev);
 433
 434         if (skb->data[0] != 0) {
 435                 do_kiss_params(sm, skb->data, skb->len);
 436                 dev_kfree_skb(skb);
 437                 return 0;
 438         }
 439         if (sm->skb)
 440                 return -1;
 441         netif_stop_queue(dev);
 442         sm->skb = skb;
 443         return 0;
 444 }
 445
 446 /* --------------------------------------------------------------------- */
 447
 448 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
 449 {
 450         struct sockaddr *sa = (struct sockaddr *)addr;
 451
 452         /* addr is an AX.25 shifted ASCII mac address */
 453         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 454         return 0;
 455 }
 456
 457 /* --------------------------------------------------------------------- */
 458
 459 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
 460 {
 461         struct hdlcdrv_state *sm = netdev_priv(dev);
 462
 463         /*
 464          * Get the current statistics.  This may be called with the
 465          * card open or closed.
 466          */
 467         return &sm->stats;
 468 }
 469
 470 /* --------------------------------------------------------------------- */
 471 /*
 472  * Open/initialize the board. This is called (in the current kernel)
 473  * sometime after booting when the 'ifconfig' program is run.
 474  *
 475  * This routine should set everything up anew at each open, even
 476  * registers that "should" only need to be set once at boot, so that
 477  * there is non-reboot way to recover if something goes wrong.
 478  */
 479
 480 static int hdlcdrv_open(struct net_device *dev)
 481 {
 482         struct hdlcdrv_state *s = netdev_priv(dev);
 483         int i;
 484
 485         if (!s->ops || !s->ops->open)
 486                 return -ENODEV;
 487
 488         /*
 489          * initialise some variables
 490          */
 491         s->opened = 1;
 492         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 493         s->hdlcrx.in_hdlc_rx = 0;
 494         s->hdlcrx.rx_state = 0;
 495
 496         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 497         s->hdlctx.in_hdlc_tx = 0;
 498         s->hdlctx.tx_state = 1;
 499         s->hdlctx.numflags = 0;
 500         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 501         s->hdlctx.ptt = 0;
 502         s->hdlctx.slotcnt = s->ch_params.slottime;
 503         s->hdlctx.calibrate = 0;
 504
 505         i = s->ops->open(dev);
 506         if (i)
 507                 return i;
 508         netif_start_queue(dev);
 509         return 0;
 510 }
 511
 512 /* --------------------------------------------------------------------- */
 513 /*
 514  * The inverse routine to hdlcdrv_open().
 515  */
 516
 517 static int hdlcdrv_close(struct net_device *dev)
 518 {
 519         struct hdlcdrv_state *s = netdev_priv(dev);
 520         int i = 0;
 521
 522         netif_stop_queue(dev);
 523
 524         if (s->ops && s->ops->close)
 525                 i = s->ops->close(dev);
 526         if (s->skb)
 527                 dev_kfree_skb(s->skb);
 528         s->skb = NULL;
 529         s->opened = 0;
 530         return i;
 531 }
 532
 533 /* --------------------------------------------------------------------- */
 534
 535 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 536 {
 537         struct hdlcdrv_state *s = netdev_priv(dev);
 538         struct hdlcdrv_ioctl bi;
 539
 540         if (cmd != SIOCDEVPRIVATE) {
 541                 if (s->ops && s->ops->ioctl)
 542                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 543                 return -ENOIOCTLCMD;
 544         }
 545         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 546                 return -EFAULT;
 547
 548         switch (bi.cmd) {
 549         default:
 550                 if (s->ops && s->ops->ioctl)
 551                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 552                 return -ENOIOCTLCMD;
 553
 554         case HDLCDRVCTL_GETCHANNELPAR:
 555                 bi.data.cp.tx_delay = s->ch_params.tx_delay;
 556                 bi.data.cp.tx_tail = s->ch_params.tx_tail;
 557                 bi.data.cp.slottime = s->ch_params.slottime;
 558                 bi.data.cp.ppersist = s->ch_params.ppersist;
 559                 bi.data.cp.fulldup = s->ch_params.fulldup;
 560                 break;
 561
 562         case HDLCDRVCTL_SETCHANNELPAR:
 563                 if (!capable(CAP_NET_ADMIN))
 564                         return -EACCES;
 565                 s->ch_params.tx_delay = bi.data.cp.tx_delay;
 566                 s->ch_params.tx_tail = bi.data.cp.tx_tail;
 567                 s->ch_params.slottime = bi.data.cp.slottime;
 568                 s->ch_params.ppersist = bi.data.cp.ppersist;
 569                 s->ch_params.fulldup = bi.data.cp.fulldup;
 570                 s->hdlctx.slotcnt = 1;
 571                 return 0;
 572
 573         case HDLCDRVCTL_GETMODEMPAR:
 574                 bi.data.mp.iobase = dev->base_addr;
 575                 bi.data.mp.irq = dev->irq;
 576                 bi.data.mp.dma = dev->dma;
 577                 bi.data.mp.dma2 = s->ptt_out.dma2;
 578                 bi.data.mp.seriobase = s->ptt_out.seriobase;
 579                 bi.data.mp.pariobase = s->ptt_out.pariobase;
 580                 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
 581                 break;
 582
 583         case HDLCDRVCTL_SETMODEMPAR:
 584                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
 585                         return -EACCES;
 586                 dev->base_addr = bi.data.mp.iobase;
 587                 dev->irq = bi.data.mp.irq;
 588                 dev->dma = bi.data.mp.dma;
 589                 s->ptt_out.dma2 = bi.data.mp.dma2;
 590                 s->ptt_out.seriobase = bi.data.mp.seriobase;
 591                 s->ptt_out.pariobase = bi.data.mp.pariobase;
 592                 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
 593                 return 0;
 594
 595         case HDLCDRVCTL_GETSTAT:
 596                 bi.data.cs.ptt = hdlcdrv_ptt(s);
 597                 bi.data.cs.dcd = s->hdlcrx.dcd;
 598                 bi.data.cs.ptt_keyed = s->ptt_keyed;
 599                 bi.data.cs.tx_packets = s->stats.tx_packets;
 600                 bi.data.cs.tx_errors = s->stats.tx_errors;
 601                 bi.data.cs.rx_packets = s->stats.rx_packets;
 602                 bi.data.cs.rx_errors = s->stats.rx_errors;
 603                 break;
 604
 605         case HDLCDRVCTL_OLDGETSTAT:
 606                 bi.data.ocs.ptt = hdlcdrv_ptt(s);
 607                 bi.data.ocs.dcd = s->hdlcrx.dcd;
 608                 bi.data.ocs.ptt_keyed = s->ptt_keyed;
 609                 break;
 610
 611         case HDLCDRVCTL_CALIBRATE:
 612                 if(!capable(CAP_SYS_RAWIO))
 613                         return -EPERM;
 614                 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
 615                 return 0;
 616
 617         case HDLCDRVCTL_GETSAMPLES:
 618 #ifndef HDLCDRV_DEBUG
 619                 return -EPERM;
 620 #else /* HDLCDRV_DEBUG */
 621                 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
 622                         return -EAGAIN;
 623                 bi.data.bits =
 624                         s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
 625                 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
 626                         sizeof(s->bitbuf_channel.buffer);
 627                 break;
 628 #endif /* HDLCDRV_DEBUG */
 629
 630         case HDLCDRVCTL_GETBITS:
 631 #ifndef HDLCDRV_DEBUG
 632                 return -EPERM;
 633 #else /* HDLCDRV_DEBUG */
 634                 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
 635                         return -EAGAIN;
 636                 bi.data.bits =
 637                         s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
 638                 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
 639                         sizeof(s->bitbuf_hdlc.buffer);
 640                 break;
 641 #endif /* HDLCDRV_DEBUG */
 642
 643         case HDLCDRVCTL_DRIVERNAME:
 644                 if (s->ops && s->ops->drvname) {
 645                         strncpy(bi.data.drivername, s->ops->drvname,
 646                                 sizeof(bi.data.drivername));
 647                         break;
 648                 }
 649                 bi.data.drivername[0] = '\0';
 650                 break;
 651
 652         }
 653         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 654                 return -EFAULT;
 655         return 0;
 656
 657 }
 658
 659 /* --------------------------------------------------------------------- */
 660
 661 /*
 662  * Initialize fields in hdlcdrv
 663  */
 664 static void hdlcdrv_setup(struct net_device *dev)
 665 {
 666         static const struct hdlcdrv_channel_params dflt_ch_params = {
 667                 20, 2, 10, 40, 0
 668         };
 669         struct hdlcdrv_state *s = netdev_priv(dev);
 670
 671         /*
 672          * initialize the hdlcdrv_state struct
 673          */
 674         s->ch_params = dflt_ch_params;
 675         s->ptt_keyed = 0;
 676
 677         spin_lock_init(&s->hdlcrx.hbuf.lock);
 678         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 679         s->hdlcrx.in_hdlc_rx = 0;
 680         s->hdlcrx.rx_state = 0;
 681
 682         spin_lock_init(&s->hdlctx.hbuf.lock);
 683         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 684         s->hdlctx.in_hdlc_tx = 0;
 685         s->hdlctx.tx_state = 1;
 686         s->hdlctx.numflags = 0;
 687         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 688         s->hdlctx.ptt = 0;
 689         s->hdlctx.slotcnt = s->ch_params.slottime;
 690         s->hdlctx.calibrate = 0;
 691
 692 #ifdef HDLCDRV_DEBUG
 693         s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
 694         s->bitbuf_channel.shreg = 0x80;
 695
 696         s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
 697         s->bitbuf_hdlc.shreg = 0x80;
 698 #endif /* HDLCDRV_DEBUG */
 699
 700         /*
 701          * initialize the device struct
 702          */
 703         dev->open = hdlcdrv_open;
 704         dev->stop = hdlcdrv_close;
 705         dev->do_ioctl = hdlcdrv_ioctl;
 706         dev->hard_start_xmit = hdlcdrv_send_packet;
 707         dev->get_stats = hdlcdrv_get_stats;
 708
 709         /* Fill in the fields of the device structure */
 710
 711         s->skb = NULL;
 712
 713 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 714         dev->hard_header = ax25_encapsulate;
 715         dev->rebuild_header = ax25_rebuild_header;
 716 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 717         dev->hard_header = NULL;
 718         dev->rebuild_header = NULL;
 719 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 720         dev->set_mac_address = hdlcdrv_set_mac_address;
 721
 722         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
 723         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 724         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 725         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
 726         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
 727         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
 728         dev->tx_queue_len = 16;
 729 }
 730
 731 /* --------------------------------------------------------------------- */
 732 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 733                                     unsigned int privsize, const char *ifname,
 734                                     unsigned int baseaddr, unsigned int irq,
 735                                     unsigned int dma)
 736 {
 737         struct net_device *dev;
 738         struct hdlcdrv_state *s;
 739         int err;
 740
 741         BUG_ON(ops == NULL);
 742
 743         if (privsize < sizeof(struct hdlcdrv_state))
 744                 privsize = sizeof(struct hdlcdrv_state);
 745
 746         dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
 747         if (!dev)
 748                 return ERR_PTR(-ENOMEM);
 749
 750         /*
 751          * initialize part of the hdlcdrv_state struct
 752          */
 753         s = netdev_priv(dev);
 754         s->magic = HDLCDRV_MAGIC;
 755         s->ops = ops;
 756         dev->base_addr = baseaddr;
 757         dev->irq = irq;
 758         dev->dma = dma;
 759
 760         err = register_netdev(dev);
 761         if (err < 0) {
 762                 printk(KERN_WARNING "hdlcdrv: cannot register net "
 763                        "device %s\n", dev->name);
 764                 free_netdev(dev);
 765                 dev = ERR_PTR(err);
 766         }
 767         return dev;
 768 }
 769
 770 /* --------------------------------------------------------------------- */
 771
 772 void hdlcdrv_unregister(struct net_device *dev)
 773 {
 774         struct hdlcdrv_state *s = netdev_priv(dev);
 775
 776         BUG_ON(s->magic != HDLCDRV_MAGIC);
 777
 778         if (s->opened && s->ops->close)
 779                 s->ops->close(dev);
 780         unregister_netdev(dev);
 781
 782         free_netdev(dev);
 783 }
 784
 785 /* --------------------------------------------------------------------- */
 786
 787 EXPORT_SYMBOL(hdlcdrv_receiver);
 788 EXPORT_SYMBOL(hdlcdrv_transmitter);
 789 EXPORT_SYMBOL(hdlcdrv_arbitrate);
 790 EXPORT_SYMBOL(hdlcdrv_register);
 791 EXPORT_SYMBOL(hdlcdrv_unregister);
 792
 793 /* --------------------------------------------------------------------- */
 794
 795 static int __init hdlcdrv_init_driver(void)
 796 {
 797         printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
 798         printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
 799         return 0;
 800 }
 801
 802 /* --------------------------------------------------------------------- */
 803
 804 static void __exit hdlcdrv_cleanup_driver(void)
 805 {
 806         printk(KERN_INFO "hdlcdrv: cleanup\n");
 807 }
 808
 809 /* --------------------------------------------------------------------- */
 810
 811 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 812 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
 813 MODULE_LICENSE("GPL");
 814 module_init(hdlcdrv_init_driver);
 815 module_exit(hdlcdrv_cleanup_driver);
 816
 817 /* --------------------------------------------------------------------- */