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/module.h>
  46 #include <linux/types.h>
  47 #include <linux/net.h>
  48 #include <linux/in.h>
  49 #include <linux/if.h>
  50 #include <linux/slab.h>
  51 #include <linux/errno.h>
  52 #include <linux/init.h>
  53 #include <linux/bitops.h>
  54
  55 #include <linux/netdevice.h>
  56 #include <linux/if_arp.h>
  57 #include <linux/skbuff.h>
  58 #include <linux/hdlcdrv.h>
  59 #include <net/ax25.h>
  60 #include <asm/uaccess.h>
  61
  62 #include <linux/crc-ccitt.h>
  63
  64 /* --------------------------------------------------------------------- */
  65
  66 #define KISS_VERBOSE
  67
  68 /* --------------------------------------------------------------------- */
  69
  70 #define PARAM_TXDELAY   1
  71 #define PARAM_PERSIST   2
  72 #define PARAM_SLOTTIME  3
  73 #define PARAM_TXTAIL    4
  74 #define PARAM_FULLDUP   5
  75 #define PARAM_HARDWARE  6
  76 #define PARAM_RETURN    255
  77
  78 /* --------------------------------------------------------------------- */
  79 /*
  80  * the CRC routines are stolen from WAMPES
  81  * by Dieter Deyke
  82  */
  83
  84
  85 /*---------------------------------------------------------------------------*/
  86
  87 static inline void append_crc_ccitt(unsigned char *buffer, int len)
  88 {
  89         unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
  90         *buffer++ = crc;
  91         *buffer++ = crc >> 8;
  92 }
  93
  94 /*---------------------------------------------------------------------------*/
  95
  96 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
  97 {
  98         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
  99 }
 100
 101 /*---------------------------------------------------------------------------*/
 102
 103 #if 0
 104 static int calc_crc_ccitt(const unsigned char *buf, int cnt)
 105 {
 106         unsigned int crc = 0xffff;
 107
 108         for (; cnt > 0; cnt--)
 109                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
 110         crc ^= 0xffff;
 111         return (crc & 0xffff);
 112 }
 113 #endif
 114
 115 /* ---------------------------------------------------------------------- */
 116
 117 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
 118
 119 /* ---------------------------------------------------------------------- */
 120 /*
 121  * The HDLC routines
 122  */
 123
 124 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
 125                              int num)
 126 {
 127         int added = 0;
 128
 129         while (s->hdlcrx.rx_state && num >= 8) {
 130                 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
 131                         s->hdlcrx.rx_state = 0;
 132                         return 0;
 133                 }
 134                 *s->hdlcrx.bp++ = bits >> (32-num);
 135                 s->hdlcrx.len++;
 136                 num -= 8;
 137                 added += 8;
 138         }
 139         return added;
 140 }
 141
 142 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
 143 {
 144         struct sk_buff *skb;
 145         int pkt_len;
 146         unsigned char *cp;
 147
 148         if (s->hdlcrx.len < 4)
 149                 return;
 150         if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
 151                 return;
 152         pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
 153         if (!(skb = dev_alloc_skb(pkt_len))) {
 154                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 155                 s->stats.rx_dropped++;
 156                 return;
 157         }
 158         cp = skb_put(skb, pkt_len);
 159         *cp++ = 0; /* KISS kludge */
 160         memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
 161         skb->protocol = ax25_type_trans(skb, dev);
 162         netif_rx(skb);
 163         dev->last_rx = jiffies;
 164         s->stats.rx_packets++;
 165 }
 166
 167 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
 168 {
 169         int i;
 170         unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
 171
 172         if (!s || s->magic != HDLCDRV_MAGIC)
 173                 return;
 174         if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
 175                 return;
 176
 177         while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
 178                 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
 179
 180 #ifdef HDLCDRV_DEBUG
 181                 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
 182 #endif /* HDLCDRV_DEBUG */
 183                 s->hdlcrx.bitstream >>= 16;
 184                 s->hdlcrx.bitstream |= word << 16;
 185                 s->hdlcrx.bitbuf >>= 16;
 186                 s->hdlcrx.bitbuf |= word << 16;
 187                 s->hdlcrx.numbits += 16;
 188                 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
 189                     mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
 190                     i >= 0;
 191                     i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
 192                     mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
 193                         if ((s->hdlcrx.bitstream & mask1) == mask1)
 194                                 s->hdlcrx.rx_state = 0; /* abort received */
 195                         else if ((s->hdlcrx.bitstream & mask2) == mask3) {
 196                                 /* flag received */
 197                                 if (s->hdlcrx.rx_state) {
 198                                         hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
 199                                                           << (8+i),
 200                                                           s->hdlcrx.numbits
 201                                                           -8-i);
 202                                         hdlc_rx_flag(dev, s);
 203                                 }
 204                                 s->hdlcrx.len = 0;
 205                                 s->hdlcrx.bp = s->hdlcrx.buffer;
 206                                 s->hdlcrx.rx_state = 1;
 207                                 s->hdlcrx.numbits = i;
 208                         } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
 209                                 /* stuffed bit */
 210                                 s->hdlcrx.numbits--;
 211                                 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
 212                                         ((s->hdlcrx.bitbuf & mask6) << 1);
 213                         }
 214                 }
 215                 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
 216                                                        s->hdlcrx.numbits);
 217         }
 218         clear_bit(0, &s->hdlcrx.in_hdlc_rx);
 219 }
 220
 221 /* ---------------------------------------------------------------------- */
 222
 223 static inline void do_kiss_params(struct hdlcdrv_state *s,
 224                                   unsigned char *data, unsigned long len)
 225 {
 226
 227 #ifdef KISS_VERBOSE
 228 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
 229 #else /* KISS_VERBOSE */
 230 #define PKP(a,b)
 231 #endif /* KISS_VERBOSE */
 232
 233         if (len < 2)
 234                 return;
 235         switch(data[0]) {
 236         case PARAM_TXDELAY:
 237                 s->ch_params.tx_delay = data[1];
 238                 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
 239                 break;
 240         case PARAM_PERSIST:
 241                 s->ch_params.ppersist = data[1];
 242                 PKP("p persistence = %u", s->ch_params.ppersist);
 243                 break;
 244         case PARAM_SLOTTIME:
 245                 s->ch_params.slottime = data[1];
 246                 PKP("slot time = %ums", s->ch_params.slottime);
 247                 break;
 248         case PARAM_TXTAIL:
 249                 s->ch_params.tx_tail = data[1];
 250                 PKP("TX tail = %ums", s->ch_params.tx_tail);
 251                 break;
 252         case PARAM_FULLDUP:
 253                 s->ch_params.fulldup = !!data[1];
 254                 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
 255                 break;
 256         default:
 257                 break;
 258         }
 259 #undef PKP
 260 }
 261
 262 /* ---------------------------------------------------------------------- */
 263
 264 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
 265 {
 266         unsigned int mask1, mask2, mask3;
 267         int i;
 268         struct sk_buff *skb;
 269         int pkt_len;
 270
 271         if (!s || s->magic != HDLCDRV_MAGIC)
 272                 return;
 273         if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
 274                 return;
 275         for (;;) {
 276                 if (s->hdlctx.numbits >= 16) {
 277                         if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
 278                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 279                                 return;
 280                         }
 281                         hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
 282                         s->hdlctx.bitbuf >>= 16;
 283                         s->hdlctx.numbits -= 16;
 284                 }
 285                 switch (s->hdlctx.tx_state) {
 286                 default:
 287                         clear_bit(0, &s->hdlctx.in_hdlc_tx);
 288                         return;
 289                 case 0:
 290                 case 1:
 291                         if (s->hdlctx.numflags) {
 292                                 s->hdlctx.numflags--;
 293                                 s->hdlctx.bitbuf |=
 294                                         0x7e7e << s->hdlctx.numbits;
 295                                 s->hdlctx.numbits += 16;
 296                                 break;
 297                         }
 298                         if (s->hdlctx.tx_state == 1) {
 299                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 300                                 return;
 301                         }
 302                         if (!(skb = s->skb)) {
 303                                 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
 304                                 if (flgs < 2)
 305                                         flgs = 2;
 306                                 s->hdlctx.tx_state = 1;
 307                                 s->hdlctx.numflags = flgs;
 308                                 break;
 309                         }
 310                         s->skb = NULL;
 311                         netif_wake_queue(dev);
 312                         pkt_len = skb->len-1; /* strip KISS byte */
 313                         if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
 314                                 s->hdlctx.tx_state = 0;
 315                                 s->hdlctx.numflags = 1;
 316                                 dev_kfree_skb_irq(skb);
 317                                 break;
 318                         }
 319                         memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
 320                         dev_kfree_skb_irq(skb);
 321                         s->hdlctx.bp = s->hdlctx.buffer;
 322                         append_crc_ccitt(s->hdlctx.buffer, pkt_len);
 323                         s->hdlctx.len = pkt_len+2; /* the appended CRC */
 324                         s->hdlctx.tx_state = 2;
 325                         s->hdlctx.bitstream = 0;
 326                         s->stats.tx_packets++;
 327                         break;
 328                 case 2:
 329                         if (!s->hdlctx.len) {
 330                                 s->hdlctx.tx_state = 0;
 331                                 s->hdlctx.numflags = 1;
 332                                 break;
 333                         }
 334                         s->hdlctx.len--;
 335                         s->hdlctx.bitbuf |= *s->hdlctx.bp <<
 336                                 s->hdlctx.numbits;
 337                         s->hdlctx.bitstream >>= 8;
 338                         s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
 339                         mask1 = 0x1f000;
 340                         mask2 = 0x10000;
 341                         mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
 342                         s->hdlctx.numbits += 8;
 343                         for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
 344                             mask3 = (mask3 << 1) | 1) {
 345                                 if ((s->hdlctx.bitstream & mask1) != mask1)
 346                                         continue;
 347                                 s->hdlctx.bitstream &= ~mask2;
 348                                 s->hdlctx.bitbuf =
 349                                         (s->hdlctx.bitbuf & mask3) |
 350                                                 ((s->hdlctx.bitbuf &
 351                                                  (~mask3)) << 1);
 352                                 s->hdlctx.numbits++;
 353                                 mask3 = (mask3 << 1) | 1;
 354                         }
 355                         break;
 356                 }
 357         }
 358 }
 359
 360 /* ---------------------------------------------------------------------- */
 361
 362 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
 363 {
 364         s->hdlctx.tx_state = 0;
 365         s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
 366         s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
 367         hdlcdrv_transmitter(dev, s);
 368         s->hdlctx.ptt = 1;
 369         s->ptt_keyed++;
 370 }
 371
 372 /* ---------------------------------------------------------------------- */
 373
 374 static unsigned short random_seed;
 375
 376 static inline unsigned short random_num(void)
 377 {
 378         random_seed = 28629 * random_seed + 157;
 379         return random_seed;
 380 }
 381
 382 /* ---------------------------------------------------------------------- */
 383
 384 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
 385 {
 386         if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
 387                 return;
 388         if (s->ch_params.fulldup) {
 389                 start_tx(dev, s);
 390                 return;
 391         }
 392         if (s->hdlcrx.dcd) {
 393                 s->hdlctx.slotcnt = s->ch_params.slottime;
 394                 return;
 395         }
 396         if ((--s->hdlctx.slotcnt) > 0)
 397                 return;
 398         s->hdlctx.slotcnt = s->ch_params.slottime;
 399         if ((random_num() % 256) > s->ch_params.ppersist)
 400                 return;
 401         start_tx(dev, s);
 402 }
 403
 404 /* --------------------------------------------------------------------- */
 405 /*
 406  * ===================== network driver interface =========================
 407  */
 408
 409 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
 410 {
 411         struct hdlcdrv_state *sm = netdev_priv(dev);
 412
 413         if (skb->data[0] != 0) {
 414                 do_kiss_params(sm, skb->data, skb->len);
 415                 dev_kfree_skb(skb);
 416                 return 0;
 417         }
 418         if (sm->skb)
 419                 return -1;
 420         netif_stop_queue(dev);
 421         sm->skb = skb;
 422         return 0;
 423 }
 424
 425 /* --------------------------------------------------------------------- */
 426
 427 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
 428 {
 429         struct sockaddr *sa = (struct sockaddr *)addr;
 430
 431         /* addr is an AX.25 shifted ASCII mac address */
 432         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 433         return 0;
 434 }
 435
 436 /* --------------------------------------------------------------------- */
 437
 438 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
 439 {
 440         struct hdlcdrv_state *sm = netdev_priv(dev);
 441
 442         /*
 443          * Get the current statistics.  This may be called with the
 444          * card open or closed.
 445          */
 446         return &sm->stats;
 447 }
 448
 449 /* --------------------------------------------------------------------- */
 450 /*
 451  * Open/initialize the board. This is called (in the current kernel)
 452  * sometime after booting when the 'ifconfig' program is run.
 453  *
 454  * This routine should set everything up anew at each open, even
 455  * registers that "should" only need to be set once at boot, so that
 456  * there is non-reboot way to recover if something goes wrong.
 457  */
 458
 459 static int hdlcdrv_open(struct net_device *dev)
 460 {
 461         struct hdlcdrv_state *s = netdev_priv(dev);
 462         int i;
 463
 464         if (!s->ops || !s->ops->open)
 465                 return -ENODEV;
 466
 467         /*
 468          * initialise some variables
 469          */
 470         s->opened = 1;
 471         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 472         s->hdlcrx.in_hdlc_rx = 0;
 473         s->hdlcrx.rx_state = 0;
 474
 475         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 476         s->hdlctx.in_hdlc_tx = 0;
 477         s->hdlctx.tx_state = 1;
 478         s->hdlctx.numflags = 0;
 479         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 480         s->hdlctx.ptt = 0;
 481         s->hdlctx.slotcnt = s->ch_params.slottime;
 482         s->hdlctx.calibrate = 0;
 483
 484         i = s->ops->open(dev);
 485         if (i)
 486                 return i;
 487         netif_start_queue(dev);
 488         return 0;
 489 }
 490
 491 /* --------------------------------------------------------------------- */
 492 /*
 493  * The inverse routine to hdlcdrv_open().
 494  */
 495
 496 static int hdlcdrv_close(struct net_device *dev)
 497 {
 498         struct hdlcdrv_state *s = netdev_priv(dev);
 499         int i = 0;
 500
 501         netif_stop_queue(dev);
 502
 503         if (s->ops && s->ops->close)
 504                 i = s->ops->close(dev);
 505         if (s->skb)
 506                 dev_kfree_skb(s->skb);
 507         s->skb = NULL;
 508         s->opened = 0;
 509         return i;
 510 }
 511
 512 /* --------------------------------------------------------------------- */
 513
 514 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 515 {
 516         struct hdlcdrv_state *s = netdev_priv(dev);
 517         struct hdlcdrv_ioctl bi;
 518
 519         if (cmd != SIOCDEVPRIVATE) {
 520                 if (s->ops && s->ops->ioctl)
 521                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 522                 return -ENOIOCTLCMD;
 523         }
 524         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 525                 return -EFAULT;
 526
 527         switch (bi.cmd) {
 528         default:
 529                 if (s->ops && s->ops->ioctl)
 530                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 531                 return -ENOIOCTLCMD;
 532
 533         case HDLCDRVCTL_GETCHANNELPAR:
 534                 bi.data.cp.tx_delay = s->ch_params.tx_delay;
 535                 bi.data.cp.tx_tail = s->ch_params.tx_tail;
 536                 bi.data.cp.slottime = s->ch_params.slottime;
 537                 bi.data.cp.ppersist = s->ch_params.ppersist;
 538                 bi.data.cp.fulldup = s->ch_params.fulldup;
 539                 break;
 540
 541         case HDLCDRVCTL_SETCHANNELPAR:
 542                 if (!capable(CAP_NET_ADMIN))
 543                         return -EACCES;
 544                 s->ch_params.tx_delay = bi.data.cp.tx_delay;
 545                 s->ch_params.tx_tail = bi.data.cp.tx_tail;
 546                 s->ch_params.slottime = bi.data.cp.slottime;
 547                 s->ch_params.ppersist = bi.data.cp.ppersist;
 548                 s->ch_params.fulldup = bi.data.cp.fulldup;
 549                 s->hdlctx.slotcnt = 1;
 550                 return 0;
 551
 552         case HDLCDRVCTL_GETMODEMPAR:
 553                 bi.data.mp.iobase = dev->base_addr;
 554                 bi.data.mp.irq = dev->irq;
 555                 bi.data.mp.dma = dev->dma;
 556                 bi.data.mp.dma2 = s->ptt_out.dma2;
 557                 bi.data.mp.seriobase = s->ptt_out.seriobase;
 558                 bi.data.mp.pariobase = s->ptt_out.pariobase;
 559                 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
 560                 break;
 561
 562         case HDLCDRVCTL_SETMODEMPAR:
 563                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
 564                         return -EACCES;
 565                 dev->base_addr = bi.data.mp.iobase;
 566                 dev->irq = bi.data.mp.irq;
 567                 dev->dma = bi.data.mp.dma;
 568                 s->ptt_out.dma2 = bi.data.mp.dma2;
 569                 s->ptt_out.seriobase = bi.data.mp.seriobase;
 570                 s->ptt_out.pariobase = bi.data.mp.pariobase;
 571                 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
 572                 return 0;
 573
 574         case HDLCDRVCTL_GETSTAT:
 575                 bi.data.cs.ptt = hdlcdrv_ptt(s);
 576                 bi.data.cs.dcd = s->hdlcrx.dcd;
 577                 bi.data.cs.ptt_keyed = s->ptt_keyed;
 578                 bi.data.cs.tx_packets = s->stats.tx_packets;
 579                 bi.data.cs.tx_errors = s->stats.tx_errors;
 580                 bi.data.cs.rx_packets = s->stats.rx_packets;
 581                 bi.data.cs.rx_errors = s->stats.rx_errors;
 582                 break;
 583
 584         case HDLCDRVCTL_OLDGETSTAT:
 585                 bi.data.ocs.ptt = hdlcdrv_ptt(s);
 586                 bi.data.ocs.dcd = s->hdlcrx.dcd;
 587                 bi.data.ocs.ptt_keyed = s->ptt_keyed;
 588                 break;
 589
 590         case HDLCDRVCTL_CALIBRATE:
 591                 if(!capable(CAP_SYS_RAWIO))
 592                         return -EPERM;
 593                 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
 594                 return 0;
 595
 596         case HDLCDRVCTL_GETSAMPLES:
 597 #ifndef HDLCDRV_DEBUG
 598                 return -EPERM;
 599 #else /* HDLCDRV_DEBUG */
 600                 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
 601                         return -EAGAIN;
 602                 bi.data.bits =
 603                         s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
 604                 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
 605                         sizeof(s->bitbuf_channel.buffer);
 606                 break;
 607 #endif /* HDLCDRV_DEBUG */
 608
 609         case HDLCDRVCTL_GETBITS:
 610 #ifndef HDLCDRV_DEBUG
 611                 return -EPERM;
 612 #else /* HDLCDRV_DEBUG */
 613                 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
 614                         return -EAGAIN;
 615                 bi.data.bits =
 616                         s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
 617                 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
 618                         sizeof(s->bitbuf_hdlc.buffer);
 619                 break;
 620 #endif /* HDLCDRV_DEBUG */
 621
 622         case HDLCDRVCTL_DRIVERNAME:
 623                 if (s->ops && s->ops->drvname) {
 624                         strncpy(bi.data.drivername, s->ops->drvname,
 625                                 sizeof(bi.data.drivername));
 626                         break;
 627                 }
 628                 bi.data.drivername[0] = '\0';
 629                 break;
 630
 631         }
 632         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 633                 return -EFAULT;
 634         return 0;
 635
 636 }
 637
 638 /* --------------------------------------------------------------------- */
 639
 640 /*
 641  * Initialize fields in hdlcdrv
 642  */
 643 static void hdlcdrv_setup(struct net_device *dev)
 644 {
 645         static const struct hdlcdrv_channel_params dflt_ch_params = {
 646                 20, 2, 10, 40, 0
 647         };
 648         struct hdlcdrv_state *s = netdev_priv(dev);
 649
 650         /*
 651          * initialize the hdlcdrv_state struct
 652          */
 653         s->ch_params = dflt_ch_params;
 654         s->ptt_keyed = 0;
 655
 656         spin_lock_init(&s->hdlcrx.hbuf.lock);
 657         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 658         s->hdlcrx.in_hdlc_rx = 0;
 659         s->hdlcrx.rx_state = 0;
 660
 661         spin_lock_init(&s->hdlctx.hbuf.lock);
 662         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 663         s->hdlctx.in_hdlc_tx = 0;
 664         s->hdlctx.tx_state = 1;
 665         s->hdlctx.numflags = 0;
 666         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 667         s->hdlctx.ptt = 0;
 668         s->hdlctx.slotcnt = s->ch_params.slottime;
 669         s->hdlctx.calibrate = 0;
 670
 671 #ifdef HDLCDRV_DEBUG
 672         s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
 673         s->bitbuf_channel.shreg = 0x80;
 674
 675         s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
 676         s->bitbuf_hdlc.shreg = 0x80;
 677 #endif /* HDLCDRV_DEBUG */
 678
 679         /*
 680          * initialize the device struct
 681          */
 682         dev->open = hdlcdrv_open;
 683         dev->stop = hdlcdrv_close;
 684         dev->do_ioctl = hdlcdrv_ioctl;
 685         dev->hard_start_xmit = hdlcdrv_send_packet;
 686         dev->get_stats = hdlcdrv_get_stats;
 687
 688         /* Fill in the fields of the device structure */
 689
 690         s->skb = NULL;
 691
 692         dev->hard_header = ax25_hard_header;
 693         dev->rebuild_header = ax25_rebuild_header;
 694         dev->set_mac_address = hdlcdrv_set_mac_address;
 695
 696         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
 697         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 698         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 699         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
 700         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
 701         memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
 702         dev->tx_queue_len = 16;
 703 }
 704
 705 /* --------------------------------------------------------------------- */
 706 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 707                                     unsigned int privsize, const char *ifname,
 708                                     unsigned int baseaddr, unsigned int irq,
 709                                     unsigned int dma)
 710 {
 711         struct net_device *dev;
 712         struct hdlcdrv_state *s;
 713         int err;
 714
 715         BUG_ON(ops == NULL);
 716
 717         if (privsize < sizeof(struct hdlcdrv_state))
 718                 privsize = sizeof(struct hdlcdrv_state);
 719
 720         dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
 721         if (!dev)
 722                 return ERR_PTR(-ENOMEM);
 723
 724         /*
 725          * initialize part of the hdlcdrv_state struct
 726          */
 727         s = netdev_priv(dev);
 728         s->magic = HDLCDRV_MAGIC;
 729         s->ops = ops;
 730         dev->base_addr = baseaddr;
 731         dev->irq = irq;
 732         dev->dma = dma;
 733
 734         err = register_netdev(dev);
 735         if (err < 0) {
 736                 printk(KERN_WARNING "hdlcdrv: cannot register net "
 737                        "device %s\n", dev->name);
 738                 free_netdev(dev);
 739                 dev = ERR_PTR(err);
 740         }
 741         return dev;
 742 }
 743
 744 /* --------------------------------------------------------------------- */
 745
 746 void hdlcdrv_unregister(struct net_device *dev)
 747 {
 748         struct hdlcdrv_state *s = netdev_priv(dev);
 749
 750         BUG_ON(s->magic != HDLCDRV_MAGIC);
 751
 752         if (s->opened && s->ops->close)
 753                 s->ops->close(dev);
 754         unregister_netdev(dev);
 755
 756         free_netdev(dev);
 757 }
 758
 759 /* --------------------------------------------------------------------- */
 760
 761 EXPORT_SYMBOL(hdlcdrv_receiver);
 762 EXPORT_SYMBOL(hdlcdrv_transmitter);
 763 EXPORT_SYMBOL(hdlcdrv_arbitrate);
 764 EXPORT_SYMBOL(hdlcdrv_register);
 765 EXPORT_SYMBOL(hdlcdrv_unregister);
 766
 767 /* --------------------------------------------------------------------- */
 768
 769 static int __init hdlcdrv_init_driver(void)
 770 {
 771         printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
 772         printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
 773         return 0;
 774 }
 775
 776 /* --------------------------------------------------------------------- */
 777
 778 static void __exit hdlcdrv_cleanup_driver(void)
 779 {
 780         printk(KERN_INFO "hdlcdrv: cleanup\n");
 781 }
 782
 783 /* --------------------------------------------------------------------- */
 784
 785 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 786 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
 787 MODULE_LICENSE("GPL");
 788 module_init(hdlcdrv_init_driver);
 789 module_exit(hdlcdrv_cleanup_driver);
 790
 791 /* --------------------------------------------------------------------- */