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/capability.h>
  65 #include <linux/module.h>
  66 #include <linux/ioport.h>
  67 #include <linux/string.h>
  68 #include <linux/init.h>
  69 #include <linux/interrupt.h>
  70 #include <asm/uaccess.h>
  71 #include <asm/io.h>
  72 #include <linux/hdlcdrv.h>
  73 #include <linux/baycom.h>
  74 #include <linux/jiffies.h>
  75
  76 /* --------------------------------------------------------------------- */
  77
  78 #define BAYCOM_DEBUG
  79
  80 /* --------------------------------------------------------------------- */
  81
  82 static const char bc_drvname[] = "baycom_ser_hdx";
  83 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  84 "baycom_ser_hdx: version 0.10\n";
  85
  86 /* --------------------------------------------------------------------- */
  87
  88 #define NR_PORTS 4
  89
  90 static struct net_device *baycom_device[NR_PORTS];
  91
  92 /* --------------------------------------------------------------------- */
  93
  94 #define RBR(iobase) (iobase+0)
  95 #define THR(iobase) (iobase+0)
  96 #define IER(iobase) (iobase+1)
  97 #define IIR(iobase) (iobase+2)
  98 #define FCR(iobase) (iobase+2)
  99 #define LCR(iobase) (iobase+3)
 100 #define MCR(iobase) (iobase+4)
 101 #define LSR(iobase) (iobase+5)
 102 #define MSR(iobase) (iobase+6)
 103 #define SCR(iobase) (iobase+7)
 104 #define DLL(iobase) (iobase+0)
 105 #define DLM(iobase) (iobase+1)
 106
 107 #define SER12_EXTENT 8
 108
 109 /* ---------------------------------------------------------------------- */
 110 /*
 111  * Information that need to be kept for each board.
 112  */
 113
 114 struct baycom_state {
 115         struct hdlcdrv_state hdrv;
 116
 117         int opt_dcd;
 118
 119         struct modem_state {
 120                 short arb_divider;
 121                 unsigned char flags;
 122                 unsigned int shreg;
 123                 struct modem_state_ser12 {
 124                         unsigned char tx_bit;
 125                         int dcd_sum0, dcd_sum1, dcd_sum2;
 126                         unsigned char last_sample;
 127                         unsigned char last_rxbit;
 128                         unsigned int dcd_shreg;
 129                         unsigned int dcd_time;
 130                         unsigned int bit_pll;
 131                         unsigned char interm_sample;
 132                 } ser12;
 133         } modem;
 134
 135 #ifdef BAYCOM_DEBUG
 136         struct debug_vals {
 137                 unsigned long last_jiffies;
 138                 unsigned cur_intcnt;
 139                 unsigned last_intcnt;
 140                 int cur_pllcorr;
 141                 int last_pllcorr;
 142         } debug_vals;
 143 #endif /* BAYCOM_DEBUG */
 144 };
 145
 146 /* --------------------------------------------------------------------- */
 147
 148 static inline void baycom_int_freq(struct baycom_state *bc)
 149 {
 150 #ifdef BAYCOM_DEBUG
 151         unsigned long cur_jiffies = jiffies;
 152         /*
 153          * measure the interrupt frequency
 154          */
 155         bc->debug_vals.cur_intcnt++;
 156         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 157                 bc->debug_vals.last_jiffies = cur_jiffies;
 158                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 159                 bc->debug_vals.cur_intcnt = 0;
 160                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 161                 bc->debug_vals.cur_pllcorr = 0;
 162         }
 163 #endif /* BAYCOM_DEBUG */
 164 }
 165
 166 /* --------------------------------------------------------------------- */
 167 /*
 168  * ===================== SER12 specific routines =========================
 169  */
 170
 171 static inline void ser12_set_divisor(struct net_device *dev,
 172                                      unsigned char divisor)
 173 {
 174         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 175         outb(divisor, DLL(dev->base_addr));
 176         outb(0, DLM(dev->base_addr));
 177         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 178         /*
 179          * make sure the next interrupt is generated;
 180          * 0 must be used to power the modem; the modem draws its
 181          * power from the TxD line
 182          */
 183         outb(0x00, THR(dev->base_addr));
 184         /*
 185          * it is important not to set the divider while transmitting;
 186          * this reportedly makes some UARTs generating interrupts
 187          * in the hundredthousands per second region
 188          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 189          */
 190 }
 191
 192 /* --------------------------------------------------------------------- */
 193
 194 /*
 195  * must call the TX arbitrator every 10ms
 196  */
 197 #define SER12_ARB_DIVIDER(bc)  (bc->opt_dcd ? 24 : 36)
 198
 199 #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
 200
 201 static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
 202 {
 203         /* one interrupt per channel bit */
 204         ser12_set_divisor(dev, 12);
 205         /*
 206          * first output the last bit (!) then call HDLC transmitter,
 207          * since this may take quite long
 208          */
 209         outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 210         if (bc->modem.shreg <= 1)
 211                 bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 212         bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
 213                                    (bc->modem.shreg & 1));
 214         bc->modem.shreg >>= 1;
 215 }
 216
 217 /* --------------------------------------------------------------------- */
 218
 219 static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
 220 {
 221         unsigned char cur_s;
 222         /*
 223          * do demodulator
 224          */
 225         cur_s = inb(MSR(dev->base_addr)) & 0x10;        /* the CTS line */
 226         hdlcdrv_channelbit(&bc->hdrv, cur_s);
 227         bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
 228                 (cur_s != bc->modem.ser12.last_sample);
 229         bc->modem.ser12.last_sample = cur_s;
 230         if(bc->modem.ser12.dcd_shreg & 1) {
 231                 if (!bc->opt_dcd) {
 232                         unsigned int dcdspos, dcdsneg;
 233
 234                         dcdspos = dcdsneg = 0;
 235                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
 236                         if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
 237                                 dcdspos += 2;
 238                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
 239                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
 240                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
 241
 242                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
 243                 } else
 244                         bc->modem.ser12.dcd_sum0--;
 245         }
 246         if(!bc->modem.ser12.dcd_time) {
 247                 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 248                                            bc->modem.ser12.dcd_sum1 +
 249                                            bc->modem.ser12.dcd_sum2) < 0);
 250                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 251                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 252                 /* offset to ensure DCD off on silent input */
 253                 bc->modem.ser12.dcd_sum0 = 2;
 254                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
 255         }
 256         bc->modem.ser12.dcd_time--;
 257         if (!bc->opt_dcd) {
 258                 /*
 259                  * PLL code for the improved software DCD algorithm
 260                  */
 261                 if (bc->modem.ser12.interm_sample) {
 262                         /*
 263                          * intermediate sample; set timing correction to normal
 264                          */
 265                         ser12_set_divisor(dev, 4);
 266                 } else {
 267                         /*
 268                          * do PLL correction and call HDLC receiver
 269                          */
 270                         switch (bc->modem.ser12.dcd_shreg & 7) {
 271                         case 1: /* transition too late */
 272                                 ser12_set_divisor(dev, 5);
 273 #ifdef BAYCOM_DEBUG
 274                                 bc->debug_vals.cur_pllcorr++;
 275 #endif /* BAYCOM_DEBUG */
 276                                 break;
 277                         case 4: /* transition too early */
 278                                 ser12_set_divisor(dev, 3);
 279 #ifdef BAYCOM_DEBUG
 280                                 bc->debug_vals.cur_pllcorr--;
 281 #endif /* BAYCOM_DEBUG */
 282                                 break;
 283                         default:
 284                                 ser12_set_divisor(dev, 4);
 285                                 break;
 286                         }
 287                         bc->modem.shreg >>= 1;
 288                         if (bc->modem.ser12.last_sample ==
 289                             bc->modem.ser12.last_rxbit)
 290                                 bc->modem.shreg |= 0x10000;
 291                         bc->modem.ser12.last_rxbit =
 292                                 bc->modem.ser12.last_sample;
 293                 }
 294                 if (++bc->modem.ser12.interm_sample >= 3)
 295                         bc->modem.ser12.interm_sample = 0;
 296                 /*
 297                  * DCD stuff
 298                  */
 299                 if (bc->modem.ser12.dcd_shreg & 1) {
 300                         unsigned int dcdspos, dcdsneg;
 301
 302                         dcdspos = dcdsneg = 0;
 303                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
 304                         dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
 305                                 << 1;
 306                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
 307                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
 308                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
 309
 310                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
 311                 }
 312         } else {
 313                 /*
 314                  * PLL algorithm for the hardware squelch DCD algorithm
 315                  */
 316                 if (bc->modem.ser12.interm_sample) {
 317                         /*
 318                          * intermediate sample; set timing correction to normal
 319                          */
 320                         ser12_set_divisor(dev, 6);
 321                 } else {
 322                         /*
 323                          * do PLL correction and call HDLC receiver
 324                          */
 325                         switch (bc->modem.ser12.dcd_shreg & 3) {
 326                         case 1: /* transition too late */
 327                                 ser12_set_divisor(dev, 7);
 328 #ifdef BAYCOM_DEBUG
 329                                 bc->debug_vals.cur_pllcorr++;
 330 #endif /* BAYCOM_DEBUG */
 331                                 break;
 332                         case 2: /* transition too early */
 333                                 ser12_set_divisor(dev, 5);
 334 #ifdef BAYCOM_DEBUG
 335                                 bc->debug_vals.cur_pllcorr--;
 336 #endif /* BAYCOM_DEBUG */
 337                                 break;
 338                         default:
 339                                 ser12_set_divisor(dev, 6);
 340                                 break;
 341                         }
 342                         bc->modem.shreg >>= 1;
 343                         if (bc->modem.ser12.last_sample ==
 344                             bc->modem.ser12.last_rxbit)
 345                                 bc->modem.shreg |= 0x10000;
 346                         bc->modem.ser12.last_rxbit =
 347                                 bc->modem.ser12.last_sample;
 348                 }
 349                 bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
 350                 /*
 351                  * DCD stuff
 352                  */
 353                 bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
 354         }
 355         outb(0x0d, MCR(dev->base_addr));                /* transmitter off */
 356         if (bc->modem.shreg & 1) {
 357                 hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
 358                 bc->modem.shreg = 0x10000;
 359         }
 360         if(!bc->modem.ser12.dcd_time) {
 361                 if (bc->opt_dcd & 1)
 362                         hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
 363                 else
 364                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 365                                                    bc->modem.ser12.dcd_sum1 +
 366                                                    bc->modem.ser12.dcd_sum2) < 0);
 367                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 368                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 369                 /* offset to ensure DCD off on silent input */
 370                 bc->modem.ser12.dcd_sum0 = 2;
 371                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
 372         }
 373         bc->modem.ser12.dcd_time--;
 374 }
 375
 376 /* --------------------------------------------------------------------- */
 377
 378 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
 379 {
 380         struct net_device *dev = (struct net_device *)dev_id;
 381         struct baycom_state *bc = netdev_priv(dev);
 382         unsigned char iir;
 383
 384         if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 385                 return IRQ_NONE;
 386         /* fast way out */
 387         if ((iir = inb(IIR(dev->base_addr))) & 1)
 388                 return IRQ_NONE;
 389         baycom_int_freq(bc);
 390         do {
 391                 switch (iir & 6) {
 392                 case 6:
 393                         inb(LSR(dev->base_addr));
 394                         break;
 395
 396                 case 4:
 397                         inb(RBR(dev->base_addr));
 398                         break;
 399
 400                 case 2:
 401                         /*
 402                          * check if transmitter active
 403                          */
 404                         if (hdlcdrv_ptt(&bc->hdrv))
 405                                 ser12_tx(dev, bc);
 406                         else {
 407                                 ser12_rx(dev, bc);
 408                                 bc->modem.arb_divider--;
 409                         }
 410                         outb(0x00, THR(dev->base_addr));
 411                         break;
 412
 413                 default:
 414                         inb(MSR(dev->base_addr));
 415                         break;
 416                 }
 417                 iir = inb(IIR(dev->base_addr));
 418         } while (!(iir & 1));
 419         if (bc->modem.arb_divider <= 0) {
 420                 bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
 421                 local_irq_enable();
 422                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 423         }
 424         local_irq_enable();
 425         hdlcdrv_transmitter(dev, &bc->hdrv);
 426         hdlcdrv_receiver(dev, &bc->hdrv);
 427         local_irq_disable();
 428         return IRQ_HANDLED;
 429 }
 430
 431 /* --------------------------------------------------------------------- */
 432
 433 enum uart { c_uart_unknown, c_uart_8250,
 434             c_uart_16450, c_uart_16550, c_uart_16550A};
 435 static const char *uart_str[] = {
 436         "unknown", "8250", "16450", "16550", "16550A"
 437 };
 438
 439 static enum uart ser12_check_uart(unsigned int iobase)
 440 {
 441         unsigned char b1,b2,b3;
 442         enum uart u;
 443         enum uart uart_tab[] =
 444                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 445
 446         b1 = inb(MCR(iobase));
 447         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 448         b2 = inb(MSR(iobase));
 449         outb(0x1a, MCR(iobase));
 450         b3 = inb(MSR(iobase)) & 0xf0;
 451         outb(b1, MCR(iobase));                  /* restore old values */
 452         outb(b2, MSR(iobase));
 453         if (b3 != 0x90)
 454                 return c_uart_unknown;
 455         inb(RBR(iobase));
 456         inb(RBR(iobase));
 457         outb(0x01, FCR(iobase));                /* enable FIFOs */
 458         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 459         if (u == c_uart_16450) {
 460                 outb(0x5a, SCR(iobase));
 461                 b1 = inb(SCR(iobase));
 462                 outb(0xa5, SCR(iobase));
 463                 b2 = inb(SCR(iobase));
 464                 if ((b1 != 0x5a) || (b2 != 0xa5))
 465                         u = c_uart_8250;
 466         }
 467         return u;
 468 }
 469
 470 /* --------------------------------------------------------------------- */
 471
 472 static int ser12_open(struct net_device *dev)
 473 {
 474         struct baycom_state *bc = netdev_priv(dev);
 475         enum uart u;
 476
 477         if (!dev || !bc)
 478                 return -ENXIO;
 479         if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
 480             dev->irq < 2 || dev->irq > 15)
 481                 return -ENXIO;
 482         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12"))
 483                 return -EACCES;
 484         memset(&bc->modem, 0, sizeof(bc->modem));
 485         bc->hdrv.par.bitrate = 1200;
 486         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) {
 487                 release_region(dev->base_addr, SER12_EXTENT);
 488                 return -EIO;
 489         }
 490         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 491         outb(0x0d, MCR(dev->base_addr));
 492         outb(0, IER(dev->base_addr));
 493         if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
 494                         "baycom_ser12", dev)) {
 495                 release_region(dev->base_addr, SER12_EXTENT);
 496                 return -EBUSY;
 497         }
 498         /*
 499          * enable transmitter empty interrupt
 500          */
 501         outb(2, IER(dev->base_addr));
 502         /*
 503          * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
 504          * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
 505          * depending on the usage of the software DCD routine
 506          */
 507         ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
 508         printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n",
 509                bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
 510         return 0;
 511 }
 512
 513 /* --------------------------------------------------------------------- */
 514
 515 static int ser12_close(struct net_device *dev)
 516 {
 517         struct baycom_state *bc = netdev_priv(dev);
 518
 519         if (!dev || !bc)
 520                 return -EINVAL;
 521         /*
 522          * disable interrupts
 523          */
 524         outb(0, IER(dev->base_addr));
 525         outb(1, MCR(dev->base_addr));
 526         free_irq(dev->irq, dev);
 527         release_region(dev->base_addr, SER12_EXTENT);
 528         printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
 529                bc_drvname, dev->base_addr, dev->irq);
 530         return 0;
 531 }
 532
 533 /* --------------------------------------------------------------------- */
 534 /*
 535  * ===================== hdlcdrv driver interface =========================
 536  */
 537
 538 /* --------------------------------------------------------------------- */
 539
 540 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 541                         struct hdlcdrv_ioctl *hi, int cmd);
 542
 543 /* --------------------------------------------------------------------- */
 544
 545 static struct hdlcdrv_ops ser12_ops = {
 546         .drvname = bc_drvname,
 547         .drvinfo = bc_drvinfo,
 548         .open    = ser12_open,
 549         .close   = ser12_close,
 550         .ioctl   = baycom_ioctl,
 551 };
 552
 553 /* --------------------------------------------------------------------- */
 554
 555 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 556 {
 557         if (strchr(modestr, '*'))
 558                 bc->opt_dcd = 0;
 559         else if (strchr(modestr, '+'))
 560                 bc->opt_dcd = -1;
 561         else if (strchr(modestr, '@'))
 562                 bc->opt_dcd = -2;
 563         else
 564                 bc->opt_dcd = 1;
 565         return 0;
 566 }
 567
 568 /* --------------------------------------------------------------------- */
 569
 570 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 571                         struct hdlcdrv_ioctl *hi, int cmd)
 572 {
 573         struct baycom_state *bc;
 574         struct baycom_ioctl bi;
 575
 576         if (!dev)
 577                 return -EINVAL;
 578
 579         bc = netdev_priv(dev);
 580         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 581
 582         if (cmd != SIOCDEVPRIVATE)
 583                 return -ENOIOCTLCMD;
 584         switch (hi->cmd) {
 585         default:
 586                 break;
 587
 588         case HDLCDRVCTL_GETMODE:
 589                 strcpy(hi->data.modename, "ser12");
 590                 if (bc->opt_dcd <= 0)
 591                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
 592                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 593                         return -EFAULT;
 594                 return 0;
 595
 596         case HDLCDRVCTL_SETMODE:
 597                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 598                         return -EACCES;
 599                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 600                 return baycom_setmode(bc, hi->data.modename);
 601
 602         case HDLCDRVCTL_MODELIST:
 603                 strcpy(hi->data.modename, "ser12");
 604                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 605                         return -EFAULT;
 606                 return 0;
 607
 608         case HDLCDRVCTL_MODEMPARMASK:
 609                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 610
 611         }
 612
 613         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 614                 return -EFAULT;
 615         switch (bi.cmd) {
 616         default:
 617                 return -ENOIOCTLCMD;
 618
 619 #ifdef BAYCOM_DEBUG
 620         case BAYCOMCTL_GETDEBUG:
 621                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 622                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 623                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 624                 break;
 625 #endif /* BAYCOM_DEBUG */
 626
 627         }
 628         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 629                 return -EFAULT;
 630         return 0;
 631
 632 }
 633
 634 /* --------------------------------------------------------------------- */
 635
 636 /*
 637  * command line settable parameters
 638  */
 639 static char *mode[NR_PORTS] = { "ser12*", };
 640 static int iobase[NR_PORTS] = { 0x3f8, };
 641 static int irq[NR_PORTS] = { 4, };
 642
 643 module_param_array(mode, charp, NULL, 0);
 644 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 645 module_param_array(iobase, int, NULL, 0);
 646 MODULE_PARM_DESC(iobase, "baycom io base address");
 647 module_param_array(irq, int, NULL, 0);
 648 MODULE_PARM_DESC(irq, "baycom irq number");
 649
 650 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 651 MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
 652 MODULE_LICENSE("GPL");
 653
 654 /* --------------------------------------------------------------------- */
 655
 656 static int __init init_baycomserhdx(void)
 657 {
 658         int i, found = 0;
 659         char set_hw = 1;
 660
 661         printk(bc_drvinfo);
 662         /*
 663          * register net devices
 664          */
 665         for (i = 0; i < NR_PORTS; i++) {
 666                 struct net_device *dev;
 667                 struct baycom_state *bc;
 668                 char ifname[IFNAMSIZ];
 669
 670                 sprintf(ifname, "bcsh%d", i);
 671
 672                 if (!mode[i])
 673                         set_hw = 0;
 674                 if (!set_hw)
 675                         iobase[i] = irq[i] = 0;
 676
 677                 dev = hdlcdrv_register(&ser12_ops,
 678                                        sizeof(struct baycom_state),
 679                                        ifname, iobase[i], irq[i], 0);
 680                 if (IS_ERR(dev))
 681                         break;
 682
 683                 bc = netdev_priv(dev);
 684                 if (set_hw && baycom_setmode(bc, mode[i]))
 685                         set_hw = 0;
 686                 found++;
 687                 baycom_device[i] = dev;
 688         }
 689
 690         if (!found)
 691                 return -ENXIO;
 692         return 0;
 693 }
 694
 695 static void __exit cleanup_baycomserhdx(void)
 696 {
 697         int i;
 698
 699         for(i = 0; i < NR_PORTS; i++) {
 700                 struct net_device *dev = baycom_device[i];
 701
 702                 if (dev)
 703                         hdlcdrv_unregister(dev);
 704         }
 705 }
 706
 707 module_init(init_baycomserhdx);
 708 module_exit(cleanup_baycomserhdx);
 709
 710 /* --------------------------------------------------------------------- */
 711
 712 #ifndef MODULE
 713
 714 /*
 715  * format: baycom_ser_hdx=io,irq,mode
 716  * mode: ser12    hardware DCD
 717  *       ser12*   software DCD
 718  *       ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
 719  *                mutes audio input to the modem
 720  *       ser12+   hardware DCD, inverted signal at DCD pin
 721  */
 722
 723 static int __init baycom_ser_hdx_setup(char *str)
 724 {
 725         static unsigned nr_dev;
 726         int ints[3];
 727
 728         if (nr_dev >= NR_PORTS)
 729                 return 0;
 730         str = get_options(str, 3, ints);
 731         if (ints[0] < 2)
 732                 return 0;
 733         mode[nr_dev] = str;
 734         iobase[nr_dev] = ints[1];
 735         irq[nr_dev] = ints[2];
 736         nr_dev++;
 737         return 1;
 738 }
 739
 740 __setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
 741
 742 #endif /* MODULE */
 743 /* --------------------------------------------------------------------- */