i386/linux/linux-2.3.21/drivers/net/hamradio/baycom_par.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      baycom_par.c  -- baycom par96 and picpar radio modem driver.
   5  *
   6  *      Copyright (C) 1996-1999  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  *
  27  *  Supported modems
  28  *
  29  *  par96:  This is a modem for 9600 baud FSK compatible to the G3RUH standard.
  30  *          The modem does all the filtering and regenerates the receiver clock.
  31  *          Data is transferred from and to the PC via a shift register.
  32  *          The shift register is filled with 16 bits and an interrupt is
  33  *          signalled. The PC then empties the shift register in a burst. This
  34  *          modem connects to the parallel port, hence the name. The modem
  35  *          leaves the implementation of the HDLC protocol and the scrambler
  36  *          polynomial to the PC. This modem is no longer available (at least
  37  *          from Baycom) and has been replaced by the PICPAR modem (see below).
  38  *          You may however still build one from the schematics published in
  39  *          cq-DL :-).
  40  *
  41  *  picpar: This is a redesign of the par96 modem by Henning Rech, DF9IC. The
  42  *          modem is protocol compatible to par96, but uses only three low
  43  *          power ICs and can therefore be fed from the parallel port and
  44  *          does not require an additional power supply. It features
  45  *          built in DCD circuitry. The driver should therefore be configured
  46  *          for hardware DCD.
  47  *
  48  *
  49  *  Command line options (insmod command line)
  50  *
  51  *  mode     driver mode string. Valid choices are par96 and picpar.
  52  *  iobase   base address of the port; common values are 0x378, 0x278, 0x3bc
  53  *
  54  *
  55  *  History:
  56  *   0.1  26.06.96  Adapted from baycom.c and made network driver interface
  57  *        18.10.96  Changed to new user space access routines (copy_{to,from}_user)
  58  *   0.3  26.04.97  init code/data tagged
  59  *   0.4  08.07.97  alternative ser12 decoding algorithm (uses delta CTS ints)
  60  *   0.5  11.11.97  split into separate files for ser12/par96
  61  *   0.6  03.08.99  adapt to Linus' new __setup/__initcall
  62  *                  removed some pre-2.2 kernel compatibility cruft
  63  *   0.7  10.08.99  Check if parport can do SPP and is safe to access during interrupt contexts
  64  */
  65
  66 /*****************************************************************************/
  67
  68 #include <linux/version.h>
  69 #include <linux/module.h>
  70 #include <linux/kernel.h>
  71 #include <linux/sched.h>
  72 #include <linux/types.h>
  73 #include <linux/fcntl.h>
  74 #include <linux/interrupt.h>
  75 #include <linux/ioport.h>
  76 #include <linux/in.h>
  77 #include <linux/string.h>
  78 #include <asm/system.h>
  79 #include <asm/bitops.h>
  80 #include <asm/io.h>
  81 #include <asm/uaccess.h>
  82 #include <linux/init.h>
  83 #include <linux/delay.h>
  84 #include <linux/errno.h>
  85 #include <linux/netdevice.h>
  86 #include <linux/hdlcdrv.h>
  87 #include <linux/baycom.h>
  88 #include <linux/parport.h>
  89
  90 /* --------------------------------------------------------------------- */
  91
  92 #define BAYCOM_DEBUG
  93
  94 /*
  95  * modem options; bit mask
  96  */
  97 #define BAYCOM_OPTIONS_SOFTDCD  1
  98
  99 /* --------------------------------------------------------------------- */
 100
 101 static const char bc_drvname[] = "baycom_par";
 102 static const char bc_drvinfo[] = KERN_INFO "baycom_par: (C) 1996-1999 Thomas Sailer, HB9JNX/AE4WA\n"
 103 KERN_INFO "baycom_par: version 0.6 compiled " __TIME__ " " __DATE__ "\n";
 104
 105 /* --------------------------------------------------------------------- */
 106
 107 #define NR_PORTS 4
 108
 109 static struct net_device baycom_device[NR_PORTS];
 110
 111 /* --------------------------------------------------------------------- */
 112
 113 #define SER12_EXTENT 8
 114
 115 #define LPT_DATA(dev)    ((dev)->base_addr+0)
 116 #define LPT_STATUS(dev)  ((dev)->base_addr+1)
 117 #define LPT_CONTROL(dev) ((dev)->base_addr+2)
 118 #define LPT_IRQ_ENABLE      0x10
 119
 120 #define PAR96_BURSTBITS 16
 121 #define PAR96_BURST     4
 122 #define PAR96_PTT       2
 123 #define PAR96_TXBIT     1
 124 #define PAR96_ACK       0x40
 125 #define PAR96_RXBIT     0x20
 126 #define PAR96_DCD       0x10
 127 #define PAR97_POWER     0xf8
 128
 129 /* ---------------------------------------------------------------------- */
 130 /*
 131  * Information that need to be kept for each board.
 132  */
 133
 134 struct baycom_state {
 135         struct hdlcdrv_state hdrv;
 136
 137         struct pardevice *pdev;
 138         unsigned int options;
 139
 140         struct modem_state {
 141                 short arb_divider;
 142                 unsigned char flags;
 143                 unsigned int shreg;
 144                 struct modem_state_par96 {
 145                         int dcd_count;
 146                         unsigned int dcd_shreg;
 147                         unsigned long descram;
 148                         unsigned long scram;
 149                 } par96;
 150         } modem;
 151
 152 #ifdef BAYCOM_DEBUG
 153         struct debug_vals {
 154                 unsigned long last_jiffies;
 155                 unsigned cur_intcnt;
 156                 unsigned last_intcnt;
 157                 int cur_pllcorr;
 158                 int last_pllcorr;
 159         } debug_vals;
 160 #endif /* BAYCOM_DEBUG */
 161 };
 162
 163 /* --------------------------------------------------------------------- */
 164
 165 #define min(a, b) (((a) < (b)) ? (a) : (b))
 166 #define max(a, b) (((a) > (b)) ? (a) : (b))
 167
 168 /* --------------------------------------------------------------------- */
 169
 170 static void __inline__ baycom_int_freq(struct baycom_state *bc)
 171 {
 172 #ifdef BAYCOM_DEBUG
 173         unsigned long cur_jiffies = jiffies;
 174         /*
 175          * measure the interrupt frequency
 176          */
 177         bc->debug_vals.cur_intcnt++;
 178         if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
 179                 bc->debug_vals.last_jiffies = cur_jiffies;
 180                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 181                 bc->debug_vals.cur_intcnt = 0;
 182                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 183                 bc->debug_vals.cur_pllcorr = 0;
 184         }
 185 #endif /* BAYCOM_DEBUG */
 186 }
 187
 188 /* --------------------------------------------------------------------- */
 189 /*
 190  * ===================== PAR96 specific routines =========================
 191  */
 192
 193 #define PAR96_DESCRAM_TAP1 0x20000
 194 #define PAR96_DESCRAM_TAP2 0x01000
 195 #define PAR96_DESCRAM_TAP3 0x00001
 196
 197 #define PAR96_DESCRAM_TAPSH1 17
 198 #define PAR96_DESCRAM_TAPSH2 12
 199 #define PAR96_DESCRAM_TAPSH3 0
 200
 201 #define PAR96_SCRAM_TAP1 0x20000 /* X^17 */
 202 #define PAR96_SCRAM_TAPN 0x00021 /* X^0+X^5 */
 203
 204 /* --------------------------------------------------------------------- */
 205
 206 static __inline__ void par96_tx(struct net_device *dev, struct baycom_state *bc)
 207 {
 208         int i;
 209         unsigned int data = hdlcdrv_getbits(&bc->hdrv);
 210
 211         for(i = 0; i < PAR96_BURSTBITS; i++, data >>= 1) {
 212                 unsigned char val = PAR97_POWER;
 213                 bc->modem.par96.scram = ((bc->modem.par96.scram << 1) |
 214                                          (bc->modem.par96.scram & 1));
 215                 if (!(data & 1))
 216                         bc->modem.par96.scram ^= 1;
 217                 if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 1))
 218                         bc->modem.par96.scram ^=
 219                                 (PAR96_SCRAM_TAPN << 1);
 220                 if (bc->modem.par96.scram & (PAR96_SCRAM_TAP1 << 2))
 221                         val |= PAR96_TXBIT;
 222                 outb(val, LPT_DATA(dev));
 223                 outb(val | PAR96_BURST, LPT_DATA(dev));
 224         }
 225 }
 226
 227 /* --------------------------------------------------------------------- */
 228
 229 static __inline__ void par96_rx(struct net_device *dev, struct baycom_state *bc)
 230 {
 231         int i;
 232         unsigned int data, mask, mask2, descx;
 233
 234         /*
 235          * do receiver; differential decode and descramble on the fly
 236          */
 237         for(data = i = 0; i < PAR96_BURSTBITS; i++) {
 238                 bc->modem.par96.descram = (bc->modem.par96.descram << 1);
 239                 if (inb(LPT_STATUS(dev)) & PAR96_RXBIT)
 240                         bc->modem.par96.descram |= 1;
 241                 descx = bc->modem.par96.descram ^
 242                         (bc->modem.par96.descram >> 1);
 243                 /* now the diff decoded data is inverted in descram */
 244                 outb(PAR97_POWER | PAR96_PTT, LPT_DATA(dev));
 245                 descx ^= ((descx >> PAR96_DESCRAM_TAPSH1) ^
 246                           (descx >> PAR96_DESCRAM_TAPSH2));
 247                 data >>= 1;
 248                 if (!(descx & 1))
 249                         data |= 0x8000;
 250                 outb(PAR97_POWER | PAR96_PTT | PAR96_BURST, LPT_DATA(dev));
 251         }
 252         hdlcdrv_putbits(&bc->hdrv, data);
 253         /*
 254          * do DCD algorithm
 255          */
 256         if (bc->options & BAYCOM_OPTIONS_SOFTDCD) {
 257                 bc->modem.par96.dcd_shreg = (bc->modem.par96.dcd_shreg >> 16)
 258                         | (data << 16);
 259                 /* search for flags and set the dcd counter appropriately */
 260                 for(mask = 0x1fe00, mask2 = 0xfc00, i = 0;
 261                     i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
 262                         if ((bc->modem.par96.dcd_shreg & mask) == mask2)
 263                                 bc->modem.par96.dcd_count = HDLCDRV_MAXFLEN+4;
 264                 /* check for abort/noise sequences */
 265                 for(mask = 0x1fe00, mask2 = 0x1fe00, i = 0;
 266                     i < PAR96_BURSTBITS; i++, mask <<= 1, mask2 <<= 1)
 267                         if (((bc->modem.par96.dcd_shreg & mask) == mask2) &&
 268                             (bc->modem.par96.dcd_count >= 0))
 269                                 bc->modem.par96.dcd_count -= HDLCDRV_MAXFLEN-10;
 270                 /* decrement and set the dcd variable */
 271                 if (bc->modem.par96.dcd_count >= 0)
 272                         bc->modem.par96.dcd_count -= 2;
 273                 hdlcdrv_setdcd(&bc->hdrv, bc->modem.par96.dcd_count > 0);
 274         } else {
 275                 hdlcdrv_setdcd(&bc->hdrv, !!(inb(LPT_STATUS(dev)) & PAR96_DCD));
 276         }
 277 }
 278
 279 /* --------------------------------------------------------------------- */
 280
 281 static void par96_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 282 {
 283         struct net_device *dev = (struct net_device *)dev_id;
 284         struct baycom_state *bc = (struct baycom_state *)dev->priv;
 285
 286         if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 287                 return;
 288
 289         baycom_int_freq(bc);
 290         /*
 291          * check if transmitter active
 292          */
 293         if (hdlcdrv_ptt(&bc->hdrv))
 294                 par96_tx(dev, bc);
 295         else {
 296                 par96_rx(dev, bc);
 297                 if (--bc->modem.arb_divider <= 0) {
 298                         bc->modem.arb_divider = 6;
 299                         __sti();
 300                         hdlcdrv_arbitrate(dev, &bc->hdrv);
 301                 }
 302         }
 303         __sti();
 304         hdlcdrv_transmitter(dev, &bc->hdrv);
 305         hdlcdrv_receiver(dev, &bc->hdrv);
 306         __cli();
 307 }
 308
 309 /* --------------------------------------------------------------------- */
 310
 311 static void par96_wakeup(void *handle)
 312 {
 313         struct net_device *dev = (struct net_device *)handle;
 314         struct baycom_state *bc = (struct baycom_state *)dev->priv;
 315
 316         printk(KERN_DEBUG "baycom_par: %s: why am I being woken up?\n", dev->name);
 317         if (!parport_claim(bc->pdev))
 318                 printk(KERN_DEBUG "baycom_par: %s: I'm broken.\n", dev->name);
 319 }
 320
 321 /* --------------------------------------------------------------------- */
 322
 323 static int par96_open(struct net_device *dev)
 324 {
 325         struct baycom_state *bc = (struct baycom_state *)dev->priv;
 326         struct parport *pp = parport_enumerate();
 327
 328         if (!dev || !bc)
 329                 return -ENXIO;
 330         while (pp && pp->base != dev->base_addr)
 331                 pp = pp->next;
 332         if (!pp) {
 333                 printk(KERN_ERR "baycom_par: parport at 0x%lx unknown\n", dev->base_addr);
 334                 return -ENXIO;
 335         }
 336         if (pp->irq < 0) {
 337                 printk(KERN_ERR "baycom_par: parport at 0x%lx has no irq\n", pp->base);
 338                 return -ENXIO;
 339         }
 340         if ((~pp->modes) & (PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 341                 printk(KERN_ERR "baycom_par: parport at 0x%lx cannot be used\n", pp->base);
 342                 return -ENXIO;
 343         }
 344         memset(&bc->modem, 0, sizeof(bc->modem));
 345         bc->hdrv.par.bitrate = 9600;
 346         if (!(bc->pdev = parport_register_device(pp, dev->name, NULL, par96_wakeup,
 347                                                  par96_interrupt, PARPORT_DEV_EXCL, dev))) {
 348                 printk(KERN_ERR "baycom_par: cannot register parport at 0x%lx\n", pp->base);
 349                 return -ENXIO;
 350         }
 351         if (parport_claim(bc->pdev)) {
 352                 printk(KERN_ERR "baycom_par: parport at 0x%lx busy\n", pp->base);
 353                 parport_unregister_device(bc->pdev);
 354                 return -EBUSY;
 355         }
 356         dev->irq = pp->irq;
 357         /* bc->pdev->port->ops->change_mode(bc->pdev->port, PARPORT_MODE_PCSPP);  not yet implemented */
 358         bc->hdrv.par.bitrate = 9600;
 359         /* switch off PTT */
 360         outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
 361         /*bc->pdev->port->ops->enable_irq(bc->pdev->port);  not yet implemented */
 362         outb(LPT_IRQ_ENABLE, LPT_CONTROL(dev));
 363         printk(KERN_INFO "%s: par96 at iobase 0x%lx irq %u options 0x%x\n",
 364                bc_drvname, dev->base_addr, dev->irq, bc->options);
 365         MOD_INC_USE_COUNT;
 366         return 0;
 367 }
 368
 369 /* --------------------------------------------------------------------- */
 370
 371 static int par96_close(struct net_device *dev)
 372 {
 373         struct baycom_state *bc = (struct baycom_state *)dev->priv;
 374
 375         if (!dev || !bc)
 376                 return -EINVAL;
 377         /* disable interrupt */
 378         outb(0, LPT_CONTROL(dev));
 379         /*bc->pdev->port->ops->disable_irq(bc->pdev->port);  not yet implemented */
 380         /* switch off PTT */
 381         outb(PAR96_PTT | PAR97_POWER, LPT_DATA(dev));
 382         parport_release(bc->pdev);
 383         parport_unregister_device(bc->pdev);
 384         printk(KERN_INFO "%s: close par96 at iobase 0x%lx irq %u\n",
 385                bc_drvname, dev->base_addr, dev->irq);
 386         MOD_DEC_USE_COUNT;
 387         return 0;
 388 }
 389
 390 /* --------------------------------------------------------------------- */
 391 /*
 392  * ===================== hdlcdrv driver interface =========================
 393  */
 394
 395 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 396                         struct hdlcdrv_ioctl *hi, int cmd);
 397
 398 /* --------------------------------------------------------------------- */
 399
 400 static struct hdlcdrv_ops par96_ops = {
 401         bc_drvname,
 402         bc_drvinfo,
 403         par96_open,
 404         par96_close,
 405         baycom_ioctl
 406 };
 407
 408 /* --------------------------------------------------------------------- */
 409
 410 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 411 {
 412         if (!strncmp(modestr, "picpar", 6))
 413                 bc->options = 0;
 414         else if (!strncmp(modestr, "par96", 5))
 415                 bc->options = BAYCOM_OPTIONS_SOFTDCD;
 416         else
 417                 bc->options = !!strchr(modestr, '*');
 418         return 0;
 419 }
 420
 421 /* --------------------------------------------------------------------- */
 422
 423 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 424                         struct hdlcdrv_ioctl *hi, int cmd)
 425 {
 426         struct baycom_state *bc;
 427         struct baycom_ioctl bi;
 428         int cmd2;
 429
 430         if (!dev || !dev->priv ||
 431             ((struct baycom_state *)dev->priv)->hdrv.magic != HDLCDRV_MAGIC) {
 432                 printk(KERN_ERR "bc_ioctl: invalid device struct\n");
 433                 return -EINVAL;
 434         }
 435         bc = (struct baycom_state *)dev->priv;
 436
 437         if (cmd != SIOCDEVPRIVATE)
 438                 return -ENOIOCTLCMD;
 439         if (get_user(cmd2, (int *)ifr->ifr_data))
 440                 return -EFAULT;
 441         switch (hi->cmd) {
 442         default:
 443                 break;
 444
 445         case HDLCDRVCTL_GETMODE:
 446                 strcpy(hi->data.modename, bc->options ? "par96" : "picpar");
 447                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 448                         return -EFAULT;
 449                 return 0;
 450
 451         case HDLCDRVCTL_SETMODE:
 452                 if (dev->start || !suser())
 453                         return -EACCES;
 454                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 455                 return baycom_setmode(bc, hi->data.modename);
 456
 457         case HDLCDRVCTL_MODELIST:
 458                 strcpy(hi->data.modename, "par96,picpar");
 459                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 460                         return -EFAULT;
 461                 return 0;
 462
 463         case HDLCDRVCTL_MODEMPARMASK:
 464                 return HDLCDRV_PARMASK_IOBASE;
 465
 466         }
 467
 468         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 469                 return -EFAULT;
 470         switch (bi.cmd) {
 471         default:
 472                 return -ENOIOCTLCMD;
 473
 474 #ifdef BAYCOM_DEBUG
 475         case BAYCOMCTL_GETDEBUG:
 476                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 477                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 478                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 479                 break;
 480 #endif /* BAYCOM_DEBUG */
 481
 482         }
 483         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 484                 return -EFAULT;
 485         return 0;
 486
 487 }
 488
 489 /* --------------------------------------------------------------------- */
 490
 491 /*
 492  * command line settable parameters
 493  */
 494 static const char *mode[NR_PORTS] = { "picpar", };
 495 static int iobase[NR_PORTS] = { 0x378, };
 496
 497 MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
 498 MODULE_PARM_DESC(mode, "baycom operating mode; eg. par96 or picpar");
 499 MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
 500 MODULE_PARM_DESC(iobase, "baycom io base address");
 501
 502 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 503 MODULE_DESCRIPTION("Baycom par96 and picpar amateur radio modem driver");
 504
 505 /* --------------------------------------------------------------------- */
 506
 507 static int __init init_baycompar(void)
 508 {
 509         int i, j, found = 0;
 510         char set_hw = 1;
 511         struct baycom_state *bc;
 512         char ifname[HDLCDRV_IFNAMELEN];
 513
 514         printk(bc_drvinfo);
 515         /*
 516          * register net devices
 517          */
 518         for (i = 0; i < NR_PORTS; i++) {
 519                 struct net_device *dev = baycom_device+i;
 520                 sprintf(ifname, "bcp%d", i);
 521
 522                 if (!mode[i])
 523                         set_hw = 0;
 524                 if (!set_hw)
 525                         iobase[i] = 0;
 526                 j = hdlcdrv_register_hdlcdrv(dev, &par96_ops, sizeof(struct baycom_state),
 527                                              ifname, iobase[i], 0, 0);
 528                 if (!j) {
 529                         bc = (struct baycom_state *)dev->priv;
 530                         if (set_hw && baycom_setmode(bc, mode[i]))
 531                                 set_hw = 0;
 532                         found++;
 533                 } else {
 534                         printk(KERN_WARNING "%s: cannot register net device\n",
 535                                bc_drvname);
 536                 }
 537         }
 538         if (!found)
 539                 return -ENXIO;
 540         return 0;
 541 }
 542
 543 static void __exit cleanup_baycompar(void)
 544 {
 545         int i;
 546
 547         for(i = 0; i < NR_PORTS; i++) {
 548                 struct net_device *dev = baycom_device+i;
 549                 struct baycom_state *bc = (struct baycom_state *)dev->priv;
 550
 551                 if (bc) {
 552                         if (bc->hdrv.magic != HDLCDRV_MAGIC)
 553                                 printk(KERN_ERR "baycom: invalid magic in "
 554                                        "cleanup_module\n");
 555                         else
 556                                 hdlcdrv_unregister_hdlcdrv(dev);
 557                 }
 558         }
 559 }
 560
 561 module_init(init_baycompar);
 562 module_exit(cleanup_baycompar);
 563
 564 /* --------------------------------------------------------------------- */
 565
 566 #ifndef MODULE
 567
 568 /*
 569  * format: baycom_par=io,mode
 570  * mode: par96,picpar
 571  */
 572
 573 static int __init baycom_par_setup(char *str)
 574 {
 575         static unsigned __initdata nr_dev = 0;
 576         int ints[2];
 577
 578         if (nr_dev >= NR_PORTS)
 579                 return 0;
 580         str = get_options(str, 2, ints);
 581         if (ints[0] < 1)
 582                 return 0;
 583         mode[nr_dev] = str;
 584         iobase[nr_dev] = ints[1];
 585         nr_dev++;
 586         return 1;
 587 }
 588
 589 __setup("baycom_par=", baycom_par_setup);
 590
 591 #endif /* MODULE */
 592 /* --------------------------------------------------------------------- */