drivers/net/hamradio/baycom_ser_hdx.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      baycom_ser_hdx.c  -- baycom ser12 halfduplex radio modem 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  *
  27  *  Supported modems
  28  *
  29  *  ser12:  This is a very simple 1200 baud AFSK modem. The modem consists only
  30  *          of a modulator/demodulator chip, usually a TI TCM3105. The computer
  31  *          is responsible for regenerating the receiver bit clock, as well as
  32  *          for handling the HDLC protocol. The modem connects to a serial port,
  33  *          hence the name. Since the serial port is not used as an async serial
  34  *          port, the kernel driver for serial ports cannot be used, and this
  35  *          driver only supports standard serial hardware (8250, 16450, 16550A)
  36  *
  37  *
  38  *  Command line options (insmod command line)
  39  *
  40  *  mode     ser12    hardware DCD
  41  *           ser12*   software DCD
  42  *           ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
  43  *                    mutes audio input to the modem
  44  *           ser12+   hardware DCD, inverted signal at DCD pin
  45  *  iobase   base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
  46  *  irq      interrupt line of the port; common values are 4,3
  47  *
  48  *
  49  *  History:
  50  *   0.1  26.06.1996  Adapted from baycom.c and made network driver interface
  51  *        18.10.1996  Changed to new user space access routines (copy_{to,from}_user)
  52  *   0.3  26.04.1997  init code/data tagged
  53  *   0.4  08.07.1997  alternative ser12 decoding algorithm (uses delta CTS ints)
  54  *   0.5  11.11.1997  ser12/par96 split into separate files
  55  *   0.6  14.04.1998  cleanups
  56  *   0.7  03.08.1999  adapt to Linus' new __setup/__initcall
  57  *   0.8  10.08.1999  use module_init/module_exit
  58  *   0.9  12.02.2000  adapted to softnet driver interface
  59  *   0.10 03.07.2000  fix interface name handling
  60  */
  61
  62 /*****************************************************************************/
  63
  64 #include <linux/module.h>
  65 #include <linux/ioport.h>
  66 #include <linux/string.h>
  67 #include <linux/init.h>
  68 #include <asm/uaccess.h>
  69 #include <asm/io.h>
  70 #include <linux/hdlcdrv.h>
  71 #include <linux/baycom.h>
  72
  73 /* --------------------------------------------------------------------- */
  74
  75 #define BAYCOM_DEBUG
  76
  77 /* --------------------------------------------------------------------- */
  78
  79 static const char bc_drvname[] = "baycom_ser_hdx";
  80 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  81 KERN_INFO "baycom_ser_hdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
  82
  83 /* --------------------------------------------------------------------- */
  84
  85 #define NR_PORTS 4
  86
  87 static struct net_device *baycom_device[NR_PORTS];
  88
  89 /* --------------------------------------------------------------------- */
  90
  91 #define RBR(iobase) (iobase+0)
  92 #define THR(iobase) (iobase+0)
  93 #define IER(iobase) (iobase+1)
  94 #define IIR(iobase) (iobase+2)
  95 #define FCR(iobase) (iobase+2)
  96 #define LCR(iobase) (iobase+3)
  97 #define MCR(iobase) (iobase+4)
  98 #define LSR(iobase) (iobase+5)
  99 #define MSR(iobase) (iobase+6)
 100 #define SCR(iobase) (iobase+7)
 101 #define DLL(iobase) (iobase+0)
 102 #define DLM(iobase) (iobase+1)
 103
 104 #define SER12_EXTENT 8
 105
 106 /* ---------------------------------------------------------------------- */
 107 /*
 108  * Information that need to be kept for each board.
 109  */
 110
 111 struct baycom_state {
 112         struct hdlcdrv_state hdrv;
 113
 114         int opt_dcd;
 115
 116         struct modem_state {
 117                 short arb_divider;
 118                 unsigned char flags;
 119                 unsigned int shreg;
 120                 struct modem_state_ser12 {
 121                         unsigned char tx_bit;
 122                         int dcd_sum0, dcd_sum1, dcd_sum2;
 123                         unsigned char last_sample;
 124                         unsigned char last_rxbit;
 125                         unsigned int dcd_shreg;
 126                         unsigned int dcd_time;
 127                         unsigned int bit_pll;
 128                         unsigned char interm_sample;
 129                 } ser12;
 130         } modem;
 131
 132 #ifdef BAYCOM_DEBUG
 133         struct debug_vals {
 134                 unsigned long last_jiffies;
 135                 unsigned cur_intcnt;
 136                 unsigned last_intcnt;
 137                 int cur_pllcorr;
 138                 int last_pllcorr;
 139         } debug_vals;
 140 #endif /* BAYCOM_DEBUG */
 141 };
 142
 143 /* --------------------------------------------------------------------- */
 144
 145 static inline void baycom_int_freq(struct baycom_state *bc)
 146 {
 147 #ifdef BAYCOM_DEBUG
 148         unsigned long cur_jiffies = jiffies;
 149         /*
 150          * measure the interrupt frequency
 151          */
 152         bc->debug_vals.cur_intcnt++;
 153         if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
 154                 bc->debug_vals.last_jiffies = cur_jiffies;
 155                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 156                 bc->debug_vals.cur_intcnt = 0;
 157                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 158                 bc->debug_vals.cur_pllcorr = 0;
 159         }
 160 #endif /* BAYCOM_DEBUG */
 161 }
 162
 163 /* --------------------------------------------------------------------- */
 164 /*
 165  * ===================== SER12 specific routines =========================
 166  */
 167
 168 static inline void ser12_set_divisor(struct net_device *dev,
 169                                      unsigned char divisor)
 170 {
 171         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 172         outb(divisor, DLL(dev->base_addr));
 173         outb(0, DLM(dev->base_addr));
 174         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 175         /*
 176          * make sure the next interrupt is generated;
 177          * 0 must be used to power the modem; the modem draws its
 178          * power from the TxD line
 179          */
 180         outb(0x00, THR(dev->base_addr));
 181         /*
 182          * it is important not to set the divider while transmitting;
 183          * this reportedly makes some UARTs generating interrupts
 184          * in the hundredthousands per second region
 185          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 186          */
 187 }
 188
 189 /* --------------------------------------------------------------------- */
 190
 191 /*
 192  * must call the TX arbitrator every 10ms
 193  */
 194 #define SER12_ARB_DIVIDER(bc)  (bc->opt_dcd ? 24 : 36)
 195
 196 #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
 197
 198 static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
 199 {
 200         /* one interrupt per channel bit */
 201         ser12_set_divisor(dev, 12);
 202         /*
 203          * first output the last bit (!) then call HDLC transmitter,
 204          * since this may take quite long
 205          */
 206         outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 207         if (bc->modem.shreg <= 1)
 208                 bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 209         bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
 210                                    (bc->modem.shreg & 1));
 211         bc->modem.shreg >>= 1;
 212 }
 213
 214 /* --------------------------------------------------------------------- */
 215
 216 static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
 217 {
 218         unsigned char cur_s;
 219         /*
 220          * do demodulator
 221          */
 222         cur_s = inb(MSR(dev->base_addr)) & 0x10;        /* the CTS line */
 223         hdlcdrv_channelbit(&bc->hdrv, cur_s);
 224         bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
 225                 (cur_s != bc->modem.ser12.last_sample);
 226         bc->modem.ser12.last_sample = cur_s;
 227         if(bc->modem.ser12.dcd_shreg & 1) {
 228                 if (!bc->opt_dcd) {
 229                         unsigned int dcdspos, dcdsneg;
 230
 231                         dcdspos = dcdsneg = 0;
 232                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
 233                         if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
 234                                 dcdspos += 2;
 235                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
 236                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
 237                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
 238
 239                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
 240                 } else
 241                         bc->modem.ser12.dcd_sum0--;
 242         }
 243         if(!bc->modem.ser12.dcd_time) {
 244                 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 245                                            bc->modem.ser12.dcd_sum1 +
 246                                            bc->modem.ser12.dcd_sum2) < 0);
 247                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 248                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 249                 /* offset to ensure DCD off on silent input */
 250                 bc->modem.ser12.dcd_sum0 = 2;
 251                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
 252         }
 253         bc->modem.ser12.dcd_time--;
 254         if (!bc->opt_dcd) {
 255                 /*
 256                  * PLL code for the improved software DCD algorithm
 257                  */
 258                 if (bc->modem.ser12.interm_sample) {
 259                         /*
 260                          * intermediate sample; set timing correction to normal
 261                          */
 262                         ser12_set_divisor(dev, 4);
 263                 } else {
 264                         /*
 265                          * do PLL correction and call HDLC receiver
 266                          */
 267                         switch (bc->modem.ser12.dcd_shreg & 7) {
 268                         case 1: /* transition too late */
 269                                 ser12_set_divisor(dev, 5);
 270 #ifdef BAYCOM_DEBUG
 271                                 bc->debug_vals.cur_pllcorr++;
 272 #endif /* BAYCOM_DEBUG */
 273                                 break;
 274                         case 4: /* transition too early */
 275                                 ser12_set_divisor(dev, 3);
 276 #ifdef BAYCOM_DEBUG
 277                                 bc->debug_vals.cur_pllcorr--;
 278 #endif /* BAYCOM_DEBUG */
 279                                 break;
 280                         default:
 281                                 ser12_set_divisor(dev, 4);
 282                                 break;
 283                         }
 284                         bc->modem.shreg >>= 1;
 285                         if (bc->modem.ser12.last_sample ==
 286                             bc->modem.ser12.last_rxbit)
 287                                 bc->modem.shreg |= 0x10000;
 288                         bc->modem.ser12.last_rxbit =
 289                                 bc->modem.ser12.last_sample;
 290                 }
 291                 if (++bc->modem.ser12.interm_sample >= 3)
 292                         bc->modem.ser12.interm_sample = 0;
 293                 /*
 294                  * DCD stuff
 295                  */
 296                 if (bc->modem.ser12.dcd_shreg & 1) {
 297                         unsigned int dcdspos, dcdsneg;
 298
 299                         dcdspos = dcdsneg = 0;
 300                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
 301                         dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
 302                                 << 1;
 303                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
 304                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
 305                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
 306
 307                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
 308                 }
 309         } else {
 310                 /*
 311                  * PLL algorithm for the hardware squelch DCD algorithm
 312                  */
 313                 if (bc->modem.ser12.interm_sample) {
 314                         /*
 315                          * intermediate sample; set timing correction to normal
 316                          */
 317                         ser12_set_divisor(dev, 6);
 318                 } else {
 319                         /*
 320                          * do PLL correction and call HDLC receiver
 321                          */
 322                         switch (bc->modem.ser12.dcd_shreg & 3) {
 323                         case 1: /* transition too late */
 324                                 ser12_set_divisor(dev, 7);
 325 #ifdef BAYCOM_DEBUG
 326                                 bc->debug_vals.cur_pllcorr++;
 327 #endif /* BAYCOM_DEBUG */
 328                                 break;
 329                         case 2: /* transition too early */
 330                                 ser12_set_divisor(dev, 5);
 331 #ifdef BAYCOM_DEBUG
 332                                 bc->debug_vals.cur_pllcorr--;
 333 #endif /* BAYCOM_DEBUG */
 334                                 break;
 335                         default:
 336                                 ser12_set_divisor(dev, 6);
 337                                 break;
 338                         }
 339                         bc->modem.shreg >>= 1;
 340                         if (bc->modem.ser12.last_sample ==
 341                             bc->modem.ser12.last_rxbit)
 342                                 bc->modem.shreg |= 0x10000;
 343                         bc->modem.ser12.last_rxbit =
 344                                 bc->modem.ser12.last_sample;
 345                 }
 346                 bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
 347                 /*
 348                  * DCD stuff
 349                  */
 350                 bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
 351         }
 352         outb(0x0d, MCR(dev->base_addr));                /* transmitter off */
 353         if (bc->modem.shreg & 1) {
 354                 hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
 355                 bc->modem.shreg = 0x10000;
 356         }
 357         if(!bc->modem.ser12.dcd_time) {
 358                 if (bc->opt_dcd & 1)
 359                         hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
 360                 else
 361                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 362                                                    bc->modem.ser12.dcd_sum1 +
 363                                                    bc->modem.ser12.dcd_sum2) < 0);
 364                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 365                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 366                 /* offset to ensure DCD off on silent input */
 367                 bc->modem.ser12.dcd_sum0 = 2;
 368                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
 369         }
 370         bc->modem.ser12.dcd_time--;
 371 }
 372
 373 /* --------------------------------------------------------------------- */
 374
 375 static irqreturn_t ser12_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 376 {
 377         struct net_device *dev = (struct net_device *)dev_id;
 378         struct baycom_state *bc = netdev_priv(dev);
 379         unsigned char iir;
 380
 381         if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 382                 return IRQ_NONE;
 383         /* fast way out */
 384         if ((iir = inb(IIR(dev->base_addr))) & 1)
 385                 return IRQ_NONE;
 386         baycom_int_freq(bc);
 387         do {
 388                 switch (iir & 6) {
 389                 case 6:
 390                         inb(LSR(dev->base_addr));
 391                         break;
 392
 393                 case 4:
 394                         inb(RBR(dev->base_addr));
 395                         break;
 396
 397                 case 2:
 398                         /*
 399                          * check if transmitter active
 400                          */
 401                         if (hdlcdrv_ptt(&bc->hdrv))
 402                                 ser12_tx(dev, bc);
 403                         else {
 404                                 ser12_rx(dev, bc);
 405                                 bc->modem.arb_divider--;
 406                         }
 407                         outb(0x00, THR(dev->base_addr));
 408                         break;
 409
 410                 default:
 411                         inb(MSR(dev->base_addr));
 412                         break;
 413                 }
 414                 iir = inb(IIR(dev->base_addr));
 415         } while (!(iir & 1));
 416         if (bc->modem.arb_divider <= 0) {
 417                 bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
 418                 local_irq_enable();
 419                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 420         }
 421         local_irq_enable();
 422         hdlcdrv_transmitter(dev, &bc->hdrv);
 423         hdlcdrv_receiver(dev, &bc->hdrv);
 424         local_irq_disable();
 425         return IRQ_HANDLED;
 426 }
 427
 428 /* --------------------------------------------------------------------- */
 429
 430 enum uart { c_uart_unknown, c_uart_8250,
 431             c_uart_16450, c_uart_16550, c_uart_16550A};
 432 static const char *uart_str[] = {
 433         "unknown", "8250", "16450", "16550", "16550A"
 434 };
 435
 436 static enum uart ser12_check_uart(unsigned int iobase)
 437 {
 438         unsigned char b1,b2,b3;
 439         enum uart u;
 440         enum uart uart_tab[] =
 441                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 442
 443         b1 = inb(MCR(iobase));
 444         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 445         b2 = inb(MSR(iobase));
 446         outb(0x1a, MCR(iobase));
 447         b3 = inb(MSR(iobase)) & 0xf0;
 448         outb(b1, MCR(iobase));                  /* restore old values */
 449         outb(b2, MSR(iobase));
 450         if (b3 != 0x90)
 451                 return c_uart_unknown;
 452         inb(RBR(iobase));
 453         inb(RBR(iobase));
 454         outb(0x01, FCR(iobase));                /* enable FIFOs */
 455         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 456         if (u == c_uart_16450) {
 457                 outb(0x5a, SCR(iobase));
 458                 b1 = inb(SCR(iobase));
 459                 outb(0xa5, SCR(iobase));
 460                 b2 = inb(SCR(iobase));
 461                 if ((b1 != 0x5a) || (b2 != 0xa5))
 462                         u = c_uart_8250;
 463         }
 464         return u;
 465 }
 466
 467 /* --------------------------------------------------------------------- */
 468
 469 static int ser12_open(struct net_device *dev)
 470 {
 471         struct baycom_state *bc = netdev_priv(dev);
 472         enum uart u;
 473
 474         if (!dev || !bc)
 475                 return -ENXIO;
 476         if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
 477             dev->irq < 2 || dev->irq > 15)
 478                 return -ENXIO;
 479         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12"))
 480                 return -EACCES;
 481         memset(&bc->modem, 0, sizeof(bc->modem));
 482         bc->hdrv.par.bitrate = 1200;
 483         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) {
 484                 release_region(dev->base_addr, SER12_EXTENT);
 485                 return -EIO;
 486         }
 487         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 488         outb(0x0d, MCR(dev->base_addr));
 489         outb(0, IER(dev->base_addr));
 490         if (request_irq(dev->irq, ser12_interrupt, SA_INTERRUPT | SA_SHIRQ,
 491                         "baycom_ser12", dev)) {
 492                 release_region(dev->base_addr, SER12_EXTENT);
 493                 return -EBUSY;
 494         }
 495         /*
 496          * enable transmitter empty interrupt
 497          */
 498         outb(2, IER(dev->base_addr));
 499         /*
 500          * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
 501          * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
 502          * depending on the usage of the software DCD routine
 503          */
 504         ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
 505         printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n",
 506                bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
 507         return 0;
 508 }
 509
 510 /* --------------------------------------------------------------------- */
 511
 512 static int ser12_close(struct net_device *dev)
 513 {
 514         struct baycom_state *bc = netdev_priv(dev);
 515
 516         if (!dev || !bc)
 517                 return -EINVAL;
 518         /*
 519          * disable interrupts
 520          */
 521         outb(0, IER(dev->base_addr));
 522         outb(1, MCR(dev->base_addr));
 523         free_irq(dev->irq, dev);
 524         release_region(dev->base_addr, SER12_EXTENT);
 525         printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
 526                bc_drvname, dev->base_addr, dev->irq);
 527         return 0;
 528 }
 529
 530 /* --------------------------------------------------------------------- */
 531 /*
 532  * ===================== hdlcdrv driver interface =========================
 533  */
 534
 535 /* --------------------------------------------------------------------- */
 536
 537 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 538                         struct hdlcdrv_ioctl *hi, int cmd);
 539
 540 /* --------------------------------------------------------------------- */
 541
 542 static struct hdlcdrv_ops ser12_ops = {
 543         .drvname = bc_drvname,
 544         .drvinfo = bc_drvinfo,
 545         .open    = ser12_open,
 546         .close   = ser12_close,
 547         .ioctl   = baycom_ioctl,
 548 };
 549
 550 /* --------------------------------------------------------------------- */
 551
 552 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 553 {
 554         if (strchr(modestr, '*'))
 555                 bc->opt_dcd = 0;
 556         else if (strchr(modestr, '+'))
 557                 bc->opt_dcd = -1;
 558         else if (strchr(modestr, '@'))
 559                 bc->opt_dcd = -2;
 560         else
 561                 bc->opt_dcd = 1;
 562         return 0;
 563 }
 564
 565 /* --------------------------------------------------------------------- */
 566
 567 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 568                         struct hdlcdrv_ioctl *hi, int cmd)
 569 {
 570         struct baycom_state *bc;
 571         struct baycom_ioctl bi;
 572
 573         if (!dev)
 574                 return -EINVAL;
 575
 576         bc = netdev_priv(dev);
 577         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 578
 579         if (cmd != SIOCDEVPRIVATE)
 580                 return -ENOIOCTLCMD;
 581         switch (hi->cmd) {
 582         default:
 583                 break;
 584
 585         case HDLCDRVCTL_GETMODE:
 586                 strcpy(hi->data.modename, "ser12");
 587                 if (bc->opt_dcd <= 0)
 588                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
 589                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 590                         return -EFAULT;
 591                 return 0;
 592
 593         case HDLCDRVCTL_SETMODE:
 594                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 595                         return -EACCES;
 596                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 597                 return baycom_setmode(bc, hi->data.modename);
 598
 599         case HDLCDRVCTL_MODELIST:
 600                 strcpy(hi->data.modename, "ser12");
 601                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 602                         return -EFAULT;
 603                 return 0;
 604
 605         case HDLCDRVCTL_MODEMPARMASK:
 606                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 607
 608         }
 609
 610         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 611                 return -EFAULT;
 612         switch (bi.cmd) {
 613         default:
 614                 return -ENOIOCTLCMD;
 615
 616 #ifdef BAYCOM_DEBUG
 617         case BAYCOMCTL_GETDEBUG:
 618                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 619                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 620                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 621                 break;
 622 #endif /* BAYCOM_DEBUG */
 623
 624         }
 625         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 626                 return -EFAULT;
 627         return 0;
 628
 629 }
 630
 631 /* --------------------------------------------------------------------- */
 632
 633 /*
 634  * command line settable parameters
 635  */
 636 static char *mode[NR_PORTS] = { "ser12*", };
 637 static int iobase[NR_PORTS] = { 0x3f8, };
 638 static int irq[NR_PORTS] = { 4, };
 639
 640 module_param_array(mode, charp, NULL, 0);
 641 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 642 module_param_array(iobase, int, NULL, 0);
 643 MODULE_PARM_DESC(iobase, "baycom io base address");
 644 module_param_array(irq, int, NULL, 0);
 645 MODULE_PARM_DESC(irq, "baycom irq number");
 646
 647 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 648 MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
 649 MODULE_LICENSE("GPL");
 650
 651 /* --------------------------------------------------------------------- */
 652
 653 static int __init init_baycomserhdx(void)
 654 {
 655         int i, found = 0;
 656         char set_hw = 1;
 657
 658         printk(bc_drvinfo);
 659         /*
 660          * register net devices
 661          */
 662         for (i = 0; i < NR_PORTS; i++) {
 663                 struct net_device *dev;
 664                 struct baycom_state *bc;
 665                 char ifname[IFNAMSIZ];
 666
 667                 sprintf(ifname, "bcsh%d", i);
 668
 669                 if (!mode[i])
 670                         set_hw = 0;
 671                 if (!set_hw)
 672                         iobase[i] = irq[i] = 0;
 673
 674                 dev = hdlcdrv_register(&ser12_ops,
 675                                        sizeof(struct baycom_state),
 676                                        ifname, iobase[i], irq[i], 0);
 677                 if (IS_ERR(dev))
 678                         break;
 679
 680                 bc = netdev_priv(dev);
 681                 if (set_hw && baycom_setmode(bc, mode[i]))
 682                         set_hw = 0;
 683                 found++;
 684                 baycom_device[i] = dev;
 685         }
 686
 687         if (!found)
 688                 return -ENXIO;
 689         return 0;
 690 }
 691
 692 static void __exit cleanup_baycomserhdx(void)
 693 {
 694         int i;
 695
 696         for(i = 0; i < NR_PORTS; i++) {
 697                 struct net_device *dev = baycom_device[i];
 698
 699                 if (dev)
 700                         hdlcdrv_unregister(dev);
 701         }
 702 }
 703
 704 module_init(init_baycomserhdx);
 705 module_exit(cleanup_baycomserhdx);
 706
 707 /* --------------------------------------------------------------------- */
 708
 709 #ifndef MODULE
 710
 711 /*
 712  * format: baycom_ser_hdx=io,irq,mode
 713  * mode: ser12    hardware DCD
 714  *       ser12*   software DCD
 715  *       ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
 716  *                mutes audio input to the modem
 717  *       ser12+   hardware DCD, inverted signal at DCD pin
 718  */
 719
 720 static int __init baycom_ser_hdx_setup(char *str)
 721 {
 722         static unsigned nr_dev;
 723         int ints[3];
 724
 725         if (nr_dev >= NR_PORTS)
 726                 return 0;
 727         str = get_options(str, 3, ints);
 728         if (ints[0] < 2)
 729                 return 0;
 730         mode[nr_dev] = str;
 731         iobase[nr_dev] = ints[1];
 732         irq[nr_dev] = ints[2];
 733         nr_dev++;
 734         return 1;
 735 }
 736
 737 __setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
 738
 739 #endif /* MODULE */
 740 /* --------------------------------------------------------------------- */