git.oblomov.eu Git - linux-2.6/blob - 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 /*
  67  * The name of the card. Is used for messages and in the requests for
  68  * io regions, irqs and dma channels
  69  */
  70
  71 static char ax25_bcast[AX25_ADDR_LEN] =
  72 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
  73 static char ax25_nocall[AX25_ADDR_LEN] =
  74 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
  75
  76 /* --------------------------------------------------------------------- */
  77
  78 #define KISS_VERBOSE
  79
  80 /* --------------------------------------------------------------------- */
  81
  82 #define PARAM_TXDELAY   1
  83 #define PARAM_PERSIST   2
  84 #define PARAM_SLOTTIME  3
  85 #define PARAM_TXTAIL    4
  86 #define PARAM_FULLDUP   5
  87 #define PARAM_HARDWARE  6
  88 #define PARAM_RETURN    255
  89
  90 /* --------------------------------------------------------------------- */
  91 /*
  92  * the CRC routines are stolen from WAMPES
  93  * by Dieter Deyke
  94  */
  95
  96
  97 /*---------------------------------------------------------------------------*/
  98
  99 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 100 {
 101         unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
 102         *buffer++ = crc;
 103         *buffer++ = crc >> 8;
 104 }
 105
 106 /*---------------------------------------------------------------------------*/
 107
 108 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 109 {
 110         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 111 }
 112
 113 /*---------------------------------------------------------------------------*/
 114
 115 #if 0
 116 static int calc_crc_ccitt(const unsigned char *buf, int cnt)
 117 {
 118         unsigned int crc = 0xffff;
 119
 120         for (; cnt > 0; cnt--)
 121                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
 122         crc ^= 0xffff;
 123         return (crc & 0xffff);
 124 }
 125 #endif
 126
 127 /* ---------------------------------------------------------------------- */
 128
 129 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
 130
 131 /* ---------------------------------------------------------------------- */
 132 /*
 133  * The HDLC routines
 134  */
 135
 136 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
 137                              int num)
 138 {
 139         int added = 0;
 140
 141         while (s->hdlcrx.rx_state && num >= 8) {
 142                 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
 143                         s->hdlcrx.rx_state = 0;
 144                         return 0;
 145                 }
 146                 *s->hdlcrx.bp++ = bits >> (32-num);
 147                 s->hdlcrx.len++;
 148                 num -= 8;
 149                 added += 8;
 150         }
 151         return added;
 152 }
 153
 154 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
 155 {
 156         struct sk_buff *skb;
 157         int pkt_len;
 158         unsigned char *cp;
 159
 160         if (s->hdlcrx.len < 4)
 161                 return;
 162         if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
 163                 return;
 164         pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
 165         if (!(skb = dev_alloc_skb(pkt_len))) {
 166                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 167                 s->stats.rx_dropped++;
 168                 return;
 169         }
 170         cp = skb_put(skb, pkt_len);
 171         *cp++ = 0; /* KISS kludge */
 172         memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
 173         skb->protocol = ax25_type_trans(skb, dev);
 174         netif_rx(skb);
 175         dev->last_rx = jiffies;
 176         s->stats.rx_packets++;
 177 }
 178
 179 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
 180 {
 181         int i;
 182         unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
 183
 184         if (!s || s->magic != HDLCDRV_MAGIC)
 185                 return;
 186         if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
 187                 return;
 188
 189         while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
 190                 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
 191
 192 #ifdef HDLCDRV_DEBUG
 193                 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
 194 #endif /* HDLCDRV_DEBUG */
 195                 s->hdlcrx.bitstream >>= 16;
 196                 s->hdlcrx.bitstream |= word << 16;
 197                 s->hdlcrx.bitbuf >>= 16;
 198                 s->hdlcrx.bitbuf |= word << 16;
 199                 s->hdlcrx.numbits += 16;
 200                 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
 201                     mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
 202                     i >= 0;
 203                     i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
 204                     mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
 205                         if ((s->hdlcrx.bitstream & mask1) == mask1)
 206                                 s->hdlcrx.rx_state = 0; /* abort received */
 207                         else if ((s->hdlcrx.bitstream & mask2) == mask3) {
 208                                 /* flag received */
 209                                 if (s->hdlcrx.rx_state) {
 210                                         hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
 211                                                           << (8+i),
 212                                                           s->hdlcrx.numbits
 213                                                           -8-i);
 214                                         hdlc_rx_flag(dev, s);
 215                                 }
 216                                 s->hdlcrx.len = 0;
 217                                 s->hdlcrx.bp = s->hdlcrx.buffer;
 218                                 s->hdlcrx.rx_state = 1;
 219                                 s->hdlcrx.numbits = i;
 220                         } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
 221                                 /* stuffed bit */
 222                                 s->hdlcrx.numbits--;
 223                                 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
 224                                         ((s->hdlcrx.bitbuf & mask6) << 1);
 225                         }
 226                 }
 227                 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
 228                                                        s->hdlcrx.numbits);
 229         }
 230         clear_bit(0, &s->hdlcrx.in_hdlc_rx);
 231 }
 232
 233 /* ---------------------------------------------------------------------- */
 234
 235 static inline void do_kiss_params(struct hdlcdrv_state *s,
 236                                   unsigned char *data, unsigned long len)
 237 {
 238
 239 #ifdef KISS_VERBOSE
 240 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
 241 #else /* KISS_VERBOSE */
 242 #define PKP(a,b)
 243 #endif /* KISS_VERBOSE */
 244
 245         if (len < 2)
 246                 return;
 247         switch(data[0]) {
 248         case PARAM_TXDELAY:
 249                 s->ch_params.tx_delay = data[1];
 250                 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
 251                 break;
 252         case PARAM_PERSIST:
 253                 s->ch_params.ppersist = data[1];
 254                 PKP("p persistence = %u", s->ch_params.ppersist);
 255                 break;
 256         case PARAM_SLOTTIME:
 257                 s->ch_params.slottime = data[1];
 258                 PKP("slot time = %ums", s->ch_params.slottime);
 259                 break;
 260         case PARAM_TXTAIL:
 261                 s->ch_params.tx_tail = data[1];
 262                 PKP("TX tail = %ums", s->ch_params.tx_tail);
 263                 break;
 264         case PARAM_FULLDUP:
 265                 s->ch_params.fulldup = !!data[1];
 266                 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
 267                 break;
 268         default:
 269                 break;
 270         }
 271 #undef PKP
 272 }
 273
 274 /* ---------------------------------------------------------------------- */
 275
 276 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
 277 {
 278         unsigned int mask1, mask2, mask3;
 279         int i;
 280         struct sk_buff *skb;
 281         int pkt_len;
 282
 283         if (!s || s->magic != HDLCDRV_MAGIC)
 284                 return;
 285         if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
 286                 return;
 287         for (;;) {
 288                 if (s->hdlctx.numbits >= 16) {
 289                         if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
 290                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 291                                 return;
 292                         }
 293                         hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
 294                         s->hdlctx.bitbuf >>= 16;
 295                         s->hdlctx.numbits -= 16;
 296                 }
 297                 switch (s->hdlctx.tx_state) {
 298                 default:
 299                         clear_bit(0, &s->hdlctx.in_hdlc_tx);
 300                         return;
 301                 case 0:
 302                 case 1:
 303                         if (s->hdlctx.numflags) {
 304                                 s->hdlctx.numflags--;
 305                                 s->hdlctx.bitbuf |=
 306                                         0x7e7e << s->hdlctx.numbits;
 307                                 s->hdlctx.numbits += 16;
 308                                 break;
 309                         }
 310                         if (s->hdlctx.tx_state == 1) {
 311                                 clear_bit(0, &s->hdlctx.in_hdlc_tx);
 312                                 return;
 313                         }
 314                         if (!(skb = s->skb)) {
 315                                 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
 316                                 if (flgs < 2)
 317                                         flgs = 2;
 318                                 s->hdlctx.tx_state = 1;
 319                                 s->hdlctx.numflags = flgs;
 320                                 break;
 321                         }
 322                         s->skb = NULL;
 323                         netif_wake_queue(dev);
 324                         pkt_len = skb->len-1; /* strip KISS byte */
 325                         if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
 326                                 s->hdlctx.tx_state = 0;
 327                                 s->hdlctx.numflags = 1;
 328                                 dev_kfree_skb_irq(skb);
 329                                 break;
 330                         }
 331                         memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
 332                         dev_kfree_skb_irq(skb);
 333                         s->hdlctx.bp = s->hdlctx.buffer;
 334                         append_crc_ccitt(s->hdlctx.buffer, pkt_len);
 335                         s->hdlctx.len = pkt_len+2; /* the appended CRC */
 336                         s->hdlctx.tx_state = 2;
 337                         s->hdlctx.bitstream = 0;
 338                         s->stats.tx_packets++;
 339                         break;
 340                 case 2:
 341                         if (!s->hdlctx.len) {
 342                                 s->hdlctx.tx_state = 0;
 343                                 s->hdlctx.numflags = 1;
 344                                 break;
 345                         }
 346                         s->hdlctx.len--;
 347                         s->hdlctx.bitbuf |= *s->hdlctx.bp <<
 348                                 s->hdlctx.numbits;
 349                         s->hdlctx.bitstream >>= 8;
 350                         s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
 351                         mask1 = 0x1f000;
 352                         mask2 = 0x10000;
 353                         mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
 354                         s->hdlctx.numbits += 8;
 355                         for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
 356                             mask3 = (mask3 << 1) | 1) {
 357                                 if ((s->hdlctx.bitstream & mask1) != mask1)
 358                                         continue;
 359                                 s->hdlctx.bitstream &= ~mask2;
 360                                 s->hdlctx.bitbuf =
 361                                         (s->hdlctx.bitbuf & mask3) |
 362                                                 ((s->hdlctx.bitbuf &
 363                                                  (~mask3)) << 1);
 364                                 s->hdlctx.numbits++;
 365                                 mask3 = (mask3 << 1) | 1;
 366                         }
 367                         break;
 368                 }
 369         }
 370 }
 371
 372 /* ---------------------------------------------------------------------- */
 373
 374 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
 375 {
 376         s->hdlctx.tx_state = 0;
 377         s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
 378         s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
 379         hdlcdrv_transmitter(dev, s);
 380         s->hdlctx.ptt = 1;
 381         s->ptt_keyed++;
 382 }
 383
 384 /* ---------------------------------------------------------------------- */
 385
 386 static unsigned short random_seed;
 387
 388 static inline unsigned short random_num(void)
 389 {
 390         random_seed = 28629 * random_seed + 157;
 391         return random_seed;
 392 }
 393
 394 /* ---------------------------------------------------------------------- */
 395
 396 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
 397 {
 398         if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
 399                 return;
 400         if (s->ch_params.fulldup) {
 401                 start_tx(dev, s);
 402                 return;
 403         }
 404         if (s->hdlcrx.dcd) {
 405                 s->hdlctx.slotcnt = s->ch_params.slottime;
 406                 return;
 407         }
 408         if ((--s->hdlctx.slotcnt) > 0)
 409                 return;
 410         s->hdlctx.slotcnt = s->ch_params.slottime;
 411         if ((random_num() % 256) > s->ch_params.ppersist)
 412                 return;
 413         start_tx(dev, s);
 414 }
 415
 416 /* --------------------------------------------------------------------- */
 417 /*
 418  * ===================== network driver interface =========================
 419  */
 420
 421 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
 422 {
 423         struct hdlcdrv_state *sm = netdev_priv(dev);
 424
 425         if (skb->data[0] != 0) {
 426                 do_kiss_params(sm, skb->data, skb->len);
 427                 dev_kfree_skb(skb);
 428                 return 0;
 429         }
 430         if (sm->skb)
 431                 return -1;
 432         netif_stop_queue(dev);
 433         sm->skb = skb;
 434         return 0;
 435 }
 436
 437 /* --------------------------------------------------------------------- */
 438
 439 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
 440 {
 441         struct sockaddr *sa = (struct sockaddr *)addr;
 442
 443         /* addr is an AX.25 shifted ASCII mac address */
 444         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 445         return 0;
 446 }
 447
 448 /* --------------------------------------------------------------------- */
 449
 450 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
 451 {
 452         struct hdlcdrv_state *sm = netdev_priv(dev);
 453
 454         /*
 455          * Get the current statistics.  This may be called with the
 456          * card open or closed.
 457          */
 458         return &sm->stats;
 459 }
 460
 461 /* --------------------------------------------------------------------- */
 462 /*
 463  * Open/initialize the board. This is called (in the current kernel)
 464  * sometime after booting when the 'ifconfig' program is run.
 465  *
 466  * This routine should set everything up anew at each open, even
 467  * registers that "should" only need to be set once at boot, so that
 468  * there is non-reboot way to recover if something goes wrong.
 469  */
 470
 471 static int hdlcdrv_open(struct net_device *dev)
 472 {
 473         struct hdlcdrv_state *s = netdev_priv(dev);
 474         int i;
 475
 476         if (!s->ops || !s->ops->open)
 477                 return -ENODEV;
 478
 479         /*
 480          * initialise some variables
 481          */
 482         s->opened = 1;
 483         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 484         s->hdlcrx.in_hdlc_rx = 0;
 485         s->hdlcrx.rx_state = 0;
 486
 487         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 488         s->hdlctx.in_hdlc_tx = 0;
 489         s->hdlctx.tx_state = 1;
 490         s->hdlctx.numflags = 0;
 491         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 492         s->hdlctx.ptt = 0;
 493         s->hdlctx.slotcnt = s->ch_params.slottime;
 494         s->hdlctx.calibrate = 0;
 495
 496         i = s->ops->open(dev);
 497         if (i)
 498                 return i;
 499         netif_start_queue(dev);
 500         return 0;
 501 }
 502
 503 /* --------------------------------------------------------------------- */
 504 /*
 505  * The inverse routine to hdlcdrv_open().
 506  */
 507
 508 static int hdlcdrv_close(struct net_device *dev)
 509 {
 510         struct hdlcdrv_state *s = netdev_priv(dev);
 511         int i = 0;
 512
 513         netif_stop_queue(dev);
 514
 515         if (s->ops && s->ops->close)
 516                 i = s->ops->close(dev);
 517         if (s->skb)
 518                 dev_kfree_skb(s->skb);
 519         s->skb = NULL;
 520         s->opened = 0;
 521         return i;
 522 }
 523
 524 /* --------------------------------------------------------------------- */
 525
 526 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 527 {
 528         struct hdlcdrv_state *s = netdev_priv(dev);
 529         struct hdlcdrv_ioctl bi;
 530
 531         if (cmd != SIOCDEVPRIVATE) {
 532                 if (s->ops && s->ops->ioctl)
 533                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 534                 return -ENOIOCTLCMD;
 535         }
 536         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 537                 return -EFAULT;
 538
 539         switch (bi.cmd) {
 540         default:
 541                 if (s->ops && s->ops->ioctl)
 542                         return s->ops->ioctl(dev, ifr, &bi, cmd);
 543                 return -ENOIOCTLCMD;
 544
 545         case HDLCDRVCTL_GETCHANNELPAR:
 546                 bi.data.cp.tx_delay = s->ch_params.tx_delay;
 547                 bi.data.cp.tx_tail = s->ch_params.tx_tail;
 548                 bi.data.cp.slottime = s->ch_params.slottime;
 549                 bi.data.cp.ppersist = s->ch_params.ppersist;
 550                 bi.data.cp.fulldup = s->ch_params.fulldup;
 551                 break;
 552
 553         case HDLCDRVCTL_SETCHANNELPAR:
 554                 if (!capable(CAP_NET_ADMIN))
 555                         return -EACCES;
 556                 s->ch_params.tx_delay = bi.data.cp.tx_delay;
 557                 s->ch_params.tx_tail = bi.data.cp.tx_tail;
 558                 s->ch_params.slottime = bi.data.cp.slottime;
 559                 s->ch_params.ppersist = bi.data.cp.ppersist;
 560                 s->ch_params.fulldup = bi.data.cp.fulldup;
 561                 s->hdlctx.slotcnt = 1;
 562                 return 0;
 563
 564         case HDLCDRVCTL_GETMODEMPAR:
 565                 bi.data.mp.iobase = dev->base_addr;
 566                 bi.data.mp.irq = dev->irq;
 567                 bi.data.mp.dma = dev->dma;
 568                 bi.data.mp.dma2 = s->ptt_out.dma2;
 569                 bi.data.mp.seriobase = s->ptt_out.seriobase;
 570                 bi.data.mp.pariobase = s->ptt_out.pariobase;
 571                 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
 572                 break;
 573
 574         case HDLCDRVCTL_SETMODEMPAR:
 575                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
 576                         return -EACCES;
 577                 dev->base_addr = bi.data.mp.iobase;
 578                 dev->irq = bi.data.mp.irq;
 579                 dev->dma = bi.data.mp.dma;
 580                 s->ptt_out.dma2 = bi.data.mp.dma2;
 581                 s->ptt_out.seriobase = bi.data.mp.seriobase;
 582                 s->ptt_out.pariobase = bi.data.mp.pariobase;
 583                 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
 584                 return 0;
 585
 586         case HDLCDRVCTL_GETSTAT:
 587                 bi.data.cs.ptt = hdlcdrv_ptt(s);
 588                 bi.data.cs.dcd = s->hdlcrx.dcd;
 589                 bi.data.cs.ptt_keyed = s->ptt_keyed;
 590                 bi.data.cs.tx_packets = s->stats.tx_packets;
 591                 bi.data.cs.tx_errors = s->stats.tx_errors;
 592                 bi.data.cs.rx_packets = s->stats.rx_packets;
 593                 bi.data.cs.rx_errors = s->stats.rx_errors;
 594                 break;
 595
 596         case HDLCDRVCTL_OLDGETSTAT:
 597                 bi.data.ocs.ptt = hdlcdrv_ptt(s);
 598                 bi.data.ocs.dcd = s->hdlcrx.dcd;
 599                 bi.data.ocs.ptt_keyed = s->ptt_keyed;
 600                 break;
 601
 602         case HDLCDRVCTL_CALIBRATE:
 603                 if(!capable(CAP_SYS_RAWIO))
 604                         return -EPERM;
 605                 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
 606                 return 0;
 607
 608         case HDLCDRVCTL_GETSAMPLES:
 609 #ifndef HDLCDRV_DEBUG
 610                 return -EPERM;
 611 #else /* HDLCDRV_DEBUG */
 612                 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
 613                         return -EAGAIN;
 614                 bi.data.bits =
 615                         s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
 616                 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
 617                         sizeof(s->bitbuf_channel.buffer);
 618                 break;
 619 #endif /* HDLCDRV_DEBUG */
 620
 621         case HDLCDRVCTL_GETBITS:
 622 #ifndef HDLCDRV_DEBUG
 623                 return -EPERM;
 624 #else /* HDLCDRV_DEBUG */
 625                 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
 626                         return -EAGAIN;
 627                 bi.data.bits =
 628                         s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
 629                 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
 630                         sizeof(s->bitbuf_hdlc.buffer);
 631                 break;
 632 #endif /* HDLCDRV_DEBUG */
 633
 634         case HDLCDRVCTL_DRIVERNAME:
 635                 if (s->ops && s->ops->drvname) {
 636                         strncpy(bi.data.drivername, s->ops->drvname,
 637                                 sizeof(bi.data.drivername));
 638                         break;
 639                 }
 640                 bi.data.drivername[0] = '\0';
 641                 break;
 642
 643         }
 644         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 645                 return -EFAULT;
 646         return 0;
 647
 648 }
 649
 650 /* --------------------------------------------------------------------- */
 651
 652 /*
 653  * Initialize fields in hdlcdrv
 654  */
 655 static void hdlcdrv_setup(struct net_device *dev)
 656 {
 657         static const struct hdlcdrv_channel_params dflt_ch_params = {
 658                 20, 2, 10, 40, 0
 659         };
 660         struct hdlcdrv_state *s = netdev_priv(dev);
 661
 662         /*
 663          * initialize the hdlcdrv_state struct
 664          */
 665         s->ch_params = dflt_ch_params;
 666         s->ptt_keyed = 0;
 667
 668         spin_lock_init(&s->hdlcrx.hbuf.lock);
 669         s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 670         s->hdlcrx.in_hdlc_rx = 0;
 671         s->hdlcrx.rx_state = 0;
 672
 673         spin_lock_init(&s->hdlctx.hbuf.lock);
 674         s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
 675         s->hdlctx.in_hdlc_tx = 0;
 676         s->hdlctx.tx_state = 1;
 677         s->hdlctx.numflags = 0;
 678         s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
 679         s->hdlctx.ptt = 0;
 680         s->hdlctx.slotcnt = s->ch_params.slottime;
 681         s->hdlctx.calibrate = 0;
 682
 683 #ifdef HDLCDRV_DEBUG
 684         s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
 685         s->bitbuf_channel.shreg = 0x80;
 686
 687         s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
 688         s->bitbuf_hdlc.shreg = 0x80;
 689 #endif /* HDLCDRV_DEBUG */
 690
 691         /*
 692          * initialize the device struct
 693          */
 694         dev->open = hdlcdrv_open;
 695         dev->stop = hdlcdrv_close;
 696         dev->do_ioctl = hdlcdrv_ioctl;
 697         dev->hard_start_xmit = hdlcdrv_send_packet;
 698         dev->get_stats = hdlcdrv_get_stats;
 699
 700         /* Fill in the fields of the device structure */
 701
 702         s->skb = NULL;
 703
 704         dev->hard_header = ax25_hard_header;
 705         dev->rebuild_header = ax25_rebuild_header;
 706         dev->set_mac_address = hdlcdrv_set_mac_address;
 707
 708         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
 709         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 710         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 711         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
 712         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
 713         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
 714         dev->tx_queue_len = 16;
 715 }
 716
 717 /* --------------------------------------------------------------------- */
 718 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 719                                     unsigned int privsize, const char *ifname,
 720                                     unsigned int baseaddr, unsigned int irq,
 721                                     unsigned int dma)
 722 {
 723         struct net_device *dev;
 724         struct hdlcdrv_state *s;
 725         int err;
 726
 727         BUG_ON(ops == NULL);
 728
 729         if (privsize < sizeof(struct hdlcdrv_state))
 730                 privsize = sizeof(struct hdlcdrv_state);
 731
 732         dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
 733         if (!dev)
 734                 return ERR_PTR(-ENOMEM);
 735
 736         /*
 737          * initialize part of the hdlcdrv_state struct
 738          */
 739         s = netdev_priv(dev);
 740         s->magic = HDLCDRV_MAGIC;
 741         s->ops = ops;
 742         dev->base_addr = baseaddr;
 743         dev->irq = irq;
 744         dev->dma = dma;
 745
 746         err = register_netdev(dev);
 747         if (err < 0) {
 748                 printk(KERN_WARNING "hdlcdrv: cannot register net "
 749                        "device %s\n", dev->name);
 750                 free_netdev(dev);
 751                 dev = ERR_PTR(err);
 752         }
 753         return dev;
 754 }
 755
 756 /* --------------------------------------------------------------------- */
 757
 758 void hdlcdrv_unregister(struct net_device *dev)
 759 {
 760         struct hdlcdrv_state *s = netdev_priv(dev);
 761
 762         BUG_ON(s->magic != HDLCDRV_MAGIC);
 763
 764         if (s->opened && s->ops->close)
 765                 s->ops->close(dev);
 766         unregister_netdev(dev);
 767
 768         free_netdev(dev);
 769 }
 770
 771 /* --------------------------------------------------------------------- */
 772
 773 EXPORT_SYMBOL(hdlcdrv_receiver);
 774 EXPORT_SYMBOL(hdlcdrv_transmitter);
 775 EXPORT_SYMBOL(hdlcdrv_arbitrate);
 776 EXPORT_SYMBOL(hdlcdrv_register);
 777 EXPORT_SYMBOL(hdlcdrv_unregister);
 778
 779 /* --------------------------------------------------------------------- */
 780
 781 static int __init hdlcdrv_init_driver(void)
 782 {
 783         printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
 784         printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
 785         return 0;
 786 }
 787
 788 /* --------------------------------------------------------------------- */
 789
 790 static void __exit hdlcdrv_cleanup_driver(void)
 791 {
 792         printk(KERN_INFO "hdlcdrv: cleanup\n");
 793 }
 794
 795 /* --------------------------------------------------------------------- */
 796
 797 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 798 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
 799 MODULE_LICENSE("GPL");
 800 module_init(hdlcdrv_init_driver);
 801 module_exit(hdlcdrv_cleanup_driver);
 802
 803 /* --------------------------------------------------------------------- */