drivers/net/hamradio/baycom_ser_fdx.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      baycom_ser_fdx.c  -- baycom ser12 fullduplex 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  *          This modem usually draws its supply current out of the otherwise unused
  38  *          TXD pin of the serial port. Thus a contignuous stream of 0x00-bytes
  39  *          is transmitted to achieve a positive supply voltage.
  40  *
  41  *  hsk:    This is a 4800 baud FSK modem, designed for TNC use. It works fine
  42  *          in 'baycom-mode' :-)  In contrast to the TCM3105 modem, power is
  43  *          externally supplied. So there's no need to provide the 0x00-byte-stream
  44  *          when receiving or idle, which drastically reduces interrupt load.
  45  *
  46  *  Command line options (insmod command line)
  47  *
  48  *  mode     ser#    hardware DCD
  49  *           ser#*   software DCD
  50  *           ser#+   hardware DCD, inverted signal at DCD pin
  51  *           '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
  52  *  iobase   base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
  53  *  baud     baud rate (between 300 and 4800)
  54  *  irq      interrupt line of the port; common values are 4,3
  55  *
  56  *
  57  *  History:
  58  *   0.1  26.06.1996  Adapted from baycom.c and made network driver interface
  59  *        18.10.1996  Changed to new user space access routines (copy_{to,from}_user)
  60  *   0.3  26.04.1997  init code/data tagged
  61  *   0.4  08.07.1997  alternative ser12 decoding algorithm (uses delta CTS ints)
  62  *   0.5  11.11.1997  ser12/par96 split into separate files
  63  *   0.6  24.01.1998  Thorsten Kranzkowski, dl8bcu and Thomas Sailer:
  64  *                    reduced interrupt load in transmit case
  65  *                    reworked receiver
  66  *   0.7  03.08.1999  adapt to Linus' new __setup/__initcall
  67  *   0.8  10.08.1999  use module_init/module_exit
  68  *   0.9  12.02.2000  adapted to softnet driver interface
  69  *   0.10 03.07.2000  fix interface name handling
  70  */
  71
  72 /*****************************************************************************/
  73
  74 #include <linux/module.h>
  75 #include <linux/ioport.h>
  76 #include <linux/string.h>
  77 #include <linux/init.h>
  78 #include <asm/uaccess.h>
  79 #include <asm/io.h>
  80 #include <linux/hdlcdrv.h>
  81 #include <linux/baycom.h>
  82
  83 /* --------------------------------------------------------------------- */
  84
  85 #define BAYCOM_DEBUG
  86
  87 /* --------------------------------------------------------------------- */
  88
  89 static const char bc_drvname[] = "baycom_ser_fdx";
  90 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  91 KERN_INFO "baycom_ser_fdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
  92
  93 /* --------------------------------------------------------------------- */
  94
  95 #define NR_PORTS 4
  96
  97 static struct net_device *baycom_device[NR_PORTS];
  98
  99 /* --------------------------------------------------------------------- */
 100
 101 #define RBR(iobase) (iobase+0)
 102 #define THR(iobase) (iobase+0)
 103 #define IER(iobase) (iobase+1)
 104 #define IIR(iobase) (iobase+2)
 105 #define FCR(iobase) (iobase+2)
 106 #define LCR(iobase) (iobase+3)
 107 #define MCR(iobase) (iobase+4)
 108 #define LSR(iobase) (iobase+5)
 109 #define MSR(iobase) (iobase+6)
 110 #define SCR(iobase) (iobase+7)
 111 #define DLL(iobase) (iobase+0)
 112 #define DLM(iobase) (iobase+1)
 113
 114 #define SER12_EXTENT 8
 115
 116 /* ---------------------------------------------------------------------- */
 117 /*
 118  * Information that need to be kept for each board.
 119  */
 120
 121 struct baycom_state {
 122         struct hdlcdrv_state hdrv;
 123
 124         unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
 125         int opt_dcd;
 126
 127         struct modem_state {
 128                 unsigned char flags;
 129                 unsigned char ptt;
 130                 unsigned int shreg;
 131                 struct modem_state_ser12 {
 132                         unsigned char tx_bit;
 133                         unsigned char last_rxbit;
 134                         int dcd_sum0, dcd_sum1, dcd_sum2;
 135                         int dcd_time;
 136                         unsigned int pll_time;
 137                         unsigned int txshreg;
 138                 } ser12;
 139         } modem;
 140
 141 #ifdef BAYCOM_DEBUG
 142         struct debug_vals {
 143                 unsigned long last_jiffies;
 144                 unsigned cur_intcnt;
 145                 unsigned last_intcnt;
 146                 int cur_pllcorr;
 147                 int last_pllcorr;
 148         } debug_vals;
 149 #endif /* BAYCOM_DEBUG */
 150 };
 151
 152 /* --------------------------------------------------------------------- */
 153
 154 static inline void baycom_int_freq(struct baycom_state *bc)
 155 {
 156 #ifdef BAYCOM_DEBUG
 157         unsigned long cur_jiffies = jiffies;
 158         /*
 159          * measure the interrupt frequency
 160          */
 161         bc->debug_vals.cur_intcnt++;
 162         if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
 163                 bc->debug_vals.last_jiffies = cur_jiffies;
 164                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 165                 bc->debug_vals.cur_intcnt = 0;
 166                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 167                 bc->debug_vals.cur_pllcorr = 0;
 168         }
 169 #endif /* BAYCOM_DEBUG */
 170 }
 171
 172 /* --------------------------------------------------------------------- */
 173 /*
 174  * ===================== SER12 specific routines =========================
 175  */
 176
 177 /* --------------------------------------------------------------------- */
 178
 179 static inline void ser12_set_divisor(struct net_device *dev,
 180                                      unsigned int divisor)
 181 {
 182         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 183         outb(divisor, DLL(dev->base_addr));
 184         outb(divisor >> 8, DLM(dev->base_addr));
 185         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 186         /*
 187          * make sure the next interrupt is generated;
 188          * 0 must be used to power the modem; the modem draws its
 189          * power from the TxD line
 190          */
 191         outb(0x00, THR(dev->base_addr));
 192         /*
 193          * it is important not to set the divider while transmitting;
 194          * this reportedly makes some UARTs generating interrupts
 195          * in the hundredthousands per second region
 196          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 197          */
 198 }
 199
 200 /* --------------------------------------------------------------------- */
 201
 202 #if 0
 203 static inline unsigned int hweight16(unsigned int w)
 204         __attribute__ ((unused));
 205 static inline unsigned int hweight8(unsigned int w)
 206         __attribute__ ((unused));
 207
 208 static inline unsigned int hweight16(unsigned int w)
 209 {
 210         unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
 211         res = (res & 0x3333) + ((res >> 2) & 0x3333);
 212         res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
 213         return (res & 0x00FF) + ((res >> 8) & 0x00FF);
 214 }
 215
 216 static inline unsigned int hweight8(unsigned int w)
 217 {
 218         unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
 219         res = (res & 0x33) + ((res >> 2) & 0x33);
 220         return (res & 0x0F) + ((res >> 4) & 0x0F);
 221 }
 222 #endif
 223
 224 /* --------------------------------------------------------------------- */
 225
 226 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
 227 {
 228         int timediff;
 229         int bdus8 = bc->baud_us >> 3;
 230         int bdus4 = bc->baud_us >> 2;
 231         int bdus2 = bc->baud_us >> 1;
 232
 233         timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
 234         while (timediff >= 500000)
 235                 timediff -= 1000000;
 236         while (timediff >= bdus2) {
 237                 timediff -= bc->baud_us;
 238                 bc->modem.ser12.pll_time += bc->baud_us;
 239                 bc->modem.ser12.dcd_time--;
 240                 /* first check if there is room to add a bit */
 241                 if (bc->modem.shreg & 1) {
 242                         hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
 243                         bc->modem.shreg = 0x10000;
 244                 }
 245                 /* add a one bit */
 246                 bc->modem.shreg >>= 1;
 247         }
 248         if (bc->modem.ser12.dcd_time <= 0) {
 249                 if (!bc->opt_dcd)
 250                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 251                                                    bc->modem.ser12.dcd_sum1 +
 252                                                    bc->modem.ser12.dcd_sum2) < 0);
 253                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 254                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 255                 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
 256                 bc->modem.ser12.dcd_time += 120;
 257         }
 258         if (bc->modem.ser12.last_rxbit != curs) {
 259                 bc->modem.ser12.last_rxbit = curs;
 260                 bc->modem.shreg |= 0x10000;
 261                 /* adjust the PLL */
 262                 if (timediff > 0)
 263                         bc->modem.ser12.pll_time += bdus8;
 264                 else
 265                         bc->modem.ser12.pll_time += 1000000 - bdus8;
 266                 /* update DCD */
 267                 if (abs(timediff) > bdus4)
 268                         bc->modem.ser12.dcd_sum0 += 4;
 269                 else
 270                         bc->modem.ser12.dcd_sum0--;
 271 #ifdef BAYCOM_DEBUG
 272                 bc->debug_vals.cur_pllcorr = timediff;
 273 #endif /* BAYCOM_DEBUG */
 274         }
 275         while (bc->modem.ser12.pll_time >= 1000000)
 276                 bc->modem.ser12.pll_time -= 1000000;
 277 }
 278
 279 /* --------------------------------------------------------------------- */
 280
 281 static irqreturn_t ser12_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 = netdev_priv(dev);
 285         struct timeval tv;
 286         unsigned char iir, msr;
 287         unsigned int txcount = 0;
 288
 289         if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 290                 return IRQ_NONE;
 291         /* fast way out for shared irq */
 292         if ((iir = inb(IIR(dev->base_addr))) & 1)
 293                 return IRQ_NONE;
 294         /* get current time */
 295         do_gettimeofday(&tv);
 296         msr = inb(MSR(dev->base_addr));
 297         /* delta DCD */
 298         if ((msr & 8) && bc->opt_dcd)
 299                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 300         do {
 301                 switch (iir & 6) {
 302                 case 6:
 303                         inb(LSR(dev->base_addr));
 304                         break;
 305
 306                 case 4:
 307                         inb(RBR(dev->base_addr));
 308                         break;
 309
 310                 case 2:
 311                         /*
 312                          * make sure the next interrupt is generated;
 313                          * 0 must be used to power the modem; the modem draws its
 314                          * power from the TxD line
 315                          */
 316                         outb(0x00, THR(dev->base_addr));
 317                         baycom_int_freq(bc);
 318                         txcount++;
 319                         /*
 320                          * first output the last bit (!) then call HDLC transmitter,
 321                          * since this may take quite long
 322                          */
 323                         if (bc->modem.ptt)
 324                                 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 325                         else
 326                                 outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
 327                         break;
 328
 329                 default:
 330                         msr = inb(MSR(dev->base_addr));
 331                         /* delta DCD */
 332                         if ((msr & 8) && bc->opt_dcd)
 333                                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 334                         break;
 335                 }
 336                 iir = inb(IIR(dev->base_addr));
 337         } while (!(iir & 1));
 338         ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
 339         if (bc->modem.ptt && txcount) {
 340                 if (bc->modem.ser12.txshreg <= 1) {
 341                         bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 342                         if (!hdlcdrv_ptt(&bc->hdrv)) {
 343                                 ser12_set_divisor(dev, 115200/100/8);
 344                                 bc->modem.ptt = 0;
 345                                 goto end_transmit;
 346                         }
 347                 }
 348                 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
 349                 bc->modem.ser12.txshreg >>= 1;
 350         }
 351  end_transmit:
 352         local_irq_enable();
 353         if (!bc->modem.ptt && txcount) {
 354                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 355                 if (hdlcdrv_ptt(&bc->hdrv)) {
 356                         ser12_set_divisor(dev, bc->baud_uartdiv);
 357                         bc->modem.ser12.txshreg = 1;
 358                         bc->modem.ptt = 1;
 359                 }
 360         }
 361         hdlcdrv_transmitter(dev, &bc->hdrv);
 362         hdlcdrv_receiver(dev, &bc->hdrv);
 363         local_irq_disable();
 364         return IRQ_HANDLED;
 365 }
 366
 367 /* --------------------------------------------------------------------- */
 368
 369 enum uart { c_uart_unknown, c_uart_8250,
 370             c_uart_16450, c_uart_16550, c_uart_16550A};
 371 static const char *uart_str[] = {
 372         "unknown", "8250", "16450", "16550", "16550A"
 373 };
 374
 375 static enum uart ser12_check_uart(unsigned int iobase)
 376 {
 377         unsigned char b1,b2,b3;
 378         enum uart u;
 379         enum uart uart_tab[] =
 380                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 381
 382         b1 = inb(MCR(iobase));
 383         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 384         b2 = inb(MSR(iobase));
 385         outb(0x1a, MCR(iobase));
 386         b3 = inb(MSR(iobase)) & 0xf0;
 387         outb(b1, MCR(iobase));                  /* restore old values */
 388         outb(b2, MSR(iobase));
 389         if (b3 != 0x90)
 390                 return c_uart_unknown;
 391         inb(RBR(iobase));
 392         inb(RBR(iobase));
 393         outb(0x01, FCR(iobase));                /* enable FIFOs */
 394         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 395         if (u == c_uart_16450) {
 396                 outb(0x5a, SCR(iobase));
 397                 b1 = inb(SCR(iobase));
 398                 outb(0xa5, SCR(iobase));
 399                 b2 = inb(SCR(iobase));
 400                 if ((b1 != 0x5a) || (b2 != 0xa5))
 401                         u = c_uart_8250;
 402         }
 403         return u;
 404 }
 405
 406 /* --------------------------------------------------------------------- */
 407
 408 static int ser12_open(struct net_device *dev)
 409 {
 410         struct baycom_state *bc = netdev_priv(dev);
 411         enum uart u;
 412
 413         if (!dev || !bc)
 414                 return -ENXIO;
 415         if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
 416             dev->irq < 2 || dev->irq > 15)
 417                 return -ENXIO;
 418         if (bc->baud < 300 || bc->baud > 4800)
 419                 return -EINVAL;
 420         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
 421                 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy \n",
 422                        dev->base_addr);
 423                 return -EACCES;
 424         }
 425         memset(&bc->modem, 0, sizeof(bc->modem));
 426         bc->hdrv.par.bitrate = bc->baud;
 427         bc->baud_us = 1000000/bc->baud;
 428         bc->baud_uartdiv = (115200/8)/bc->baud;
 429         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
 430                 release_region(dev->base_addr, SER12_EXTENT);
 431                 return -EIO;
 432         }
 433         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 434         outb(0x0d, MCR(dev->base_addr));
 435         outb(0, IER(dev->base_addr));
 436         if (request_irq(dev->irq, ser12_interrupt, SA_INTERRUPT | SA_SHIRQ,
 437                         "baycom_ser_fdx", dev)) {
 438                 release_region(dev->base_addr, SER12_EXTENT);
 439                 return -EBUSY;
 440         }
 441         /*
 442          * set the SIO to 6 Bits/character; during receive,
 443          * the baud rate is set to produce 100 ints/sec
 444          * to feed the channel arbitration process,
 445          * during transmit to baud ints/sec to run
 446          * the transmitter
 447          */
 448         ser12_set_divisor(dev, 115200/100/8);
 449         /*
 450          * enable transmitter empty interrupt and modem status interrupt
 451          */
 452         outb(0x0a, IER(dev->base_addr));
 453         /*
 454          * make sure the next interrupt is generated;
 455          * 0 must be used to power the modem; the modem draws its
 456          * power from the TxD line
 457          */
 458         outb(0x00, THR(dev->base_addr));
 459         hdlcdrv_setdcd(&bc->hdrv, 0);
 460         printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
 461                bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
 462         return 0;
 463 }
 464
 465 /* --------------------------------------------------------------------- */
 466
 467 static int ser12_close(struct net_device *dev)
 468 {
 469         struct baycom_state *bc = netdev_priv(dev);
 470
 471         if (!dev || !bc)
 472                 return -EINVAL;
 473         /*
 474          * disable interrupts
 475          */
 476         outb(0, IER(dev->base_addr));
 477         outb(1, MCR(dev->base_addr));
 478         free_irq(dev->irq, dev);
 479         release_region(dev->base_addr, SER12_EXTENT);
 480         printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
 481                bc_drvname, dev->base_addr, dev->irq);
 482         return 0;
 483 }
 484
 485 /* --------------------------------------------------------------------- */
 486 /*
 487  * ===================== hdlcdrv driver interface =========================
 488  */
 489
 490 /* --------------------------------------------------------------------- */
 491
 492 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 493                         struct hdlcdrv_ioctl *hi, int cmd);
 494
 495 /* --------------------------------------------------------------------- */
 496
 497 static struct hdlcdrv_ops ser12_ops = {
 498         .drvname = bc_drvname,
 499         .drvinfo = bc_drvinfo,
 500         .open    = ser12_open,
 501         .close   = ser12_close,
 502         .ioctl   = baycom_ioctl,
 503 };
 504
 505 /* --------------------------------------------------------------------- */
 506
 507 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 508 {
 509         unsigned int baud;
 510
 511         if (!strncmp(modestr, "ser", 3)) {
 512                 baud = simple_strtoul(modestr+3, NULL, 10);
 513                 if (baud >= 3 && baud <= 48)
 514                         bc->baud = baud*100;
 515         }
 516         if (strchr(modestr, '*'))
 517                 bc->opt_dcd = 0;
 518         else if (strchr(modestr, '+'))
 519                 bc->opt_dcd = -1;
 520         else
 521                 bc->opt_dcd = 1;
 522         return 0;
 523 }
 524
 525 /* --------------------------------------------------------------------- */
 526
 527 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 528                         struct hdlcdrv_ioctl *hi, int cmd)
 529 {
 530         struct baycom_state *bc;
 531         struct baycom_ioctl bi;
 532
 533         if (!dev)
 534                 return -EINVAL;
 535
 536         bc = netdev_priv(dev);
 537         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 538
 539         if (cmd != SIOCDEVPRIVATE)
 540                 return -ENOIOCTLCMD;
 541         switch (hi->cmd) {
 542         default:
 543                 break;
 544
 545         case HDLCDRVCTL_GETMODE:
 546                 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
 547                 if (bc->opt_dcd <= 0)
 548                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
 549                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 550                         return -EFAULT;
 551                 return 0;
 552
 553         case HDLCDRVCTL_SETMODE:
 554                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 555                         return -EACCES;
 556                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 557                 return baycom_setmode(bc, hi->data.modename);
 558
 559         case HDLCDRVCTL_MODELIST:
 560                 strcpy(hi->data.modename, "ser12,ser3,ser24");
 561                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 562                         return -EFAULT;
 563                 return 0;
 564
 565         case HDLCDRVCTL_MODEMPARMASK:
 566                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 567
 568         }
 569
 570         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 571                 return -EFAULT;
 572         switch (bi.cmd) {
 573         default:
 574                 return -ENOIOCTLCMD;
 575
 576 #ifdef BAYCOM_DEBUG
 577         case BAYCOMCTL_GETDEBUG:
 578                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 579                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 580                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 581                 break;
 582 #endif /* BAYCOM_DEBUG */
 583
 584         }
 585         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 586                 return -EFAULT;
 587         return 0;
 588
 589 }
 590
 591 /* --------------------------------------------------------------------- */
 592
 593 /*
 594  * command line settable parameters
 595  */
 596 static char *mode[NR_PORTS] = { "ser12*", };
 597 static int iobase[NR_PORTS] = { 0x3f8, };
 598 static int irq[NR_PORTS] = { 4, };
 599 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
 600
 601 module_param_array(mode, charp, NULL, 0);
 602 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 603 module_param_array(iobase, int, NULL, 0);
 604 MODULE_PARM_DESC(iobase, "baycom io base address");
 605 module_param_array(irq, int, NULL, 0);
 606 MODULE_PARM_DESC(irq, "baycom irq number");
 607 module_param_array(baud, int, NULL, 0);
 608 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
 609
 610 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 611 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
 612 MODULE_LICENSE("GPL");
 613
 614 /* --------------------------------------------------------------------- */
 615
 616 static int __init init_baycomserfdx(void)
 617 {
 618         int i, found = 0;
 619         char set_hw = 1;
 620
 621         printk(bc_drvinfo);
 622         /*
 623          * register net devices
 624          */
 625         for (i = 0; i < NR_PORTS; i++) {
 626                 struct net_device *dev;
 627                 struct baycom_state *bc;
 628                 char ifname[IFNAMSIZ];
 629
 630                 sprintf(ifname, "bcsf%d", i);
 631
 632                 if (!mode[i])
 633                         set_hw = 0;
 634                 if (!set_hw)
 635                         iobase[i] = irq[i] = 0;
 636
 637                 dev = hdlcdrv_register(&ser12_ops,
 638                                        sizeof(struct baycom_state),
 639                                        ifname, iobase[i], irq[i], 0);
 640                 if (IS_ERR(dev))
 641                         break;
 642
 643                 bc = netdev_priv(dev);
 644                 if (set_hw && baycom_setmode(bc, mode[i]))
 645                         set_hw = 0;
 646                 bc->baud = baud[i];
 647                 found++;
 648                 baycom_device[i] = dev;
 649         }
 650
 651         if (!found)
 652                 return -ENXIO;
 653         return 0;
 654 }
 655
 656 static void __exit cleanup_baycomserfdx(void)
 657 {
 658         int i;
 659
 660         for(i = 0; i < NR_PORTS; i++) {
 661                 struct net_device *dev = baycom_device[i];
 662                 if (dev)
 663                         hdlcdrv_unregister(dev);
 664         }
 665 }
 666
 667 module_init(init_baycomserfdx);
 668 module_exit(cleanup_baycomserfdx);
 669
 670 /* --------------------------------------------------------------------- */
 671
 672 #ifndef MODULE
 673
 674 /*
 675  * format: baycom_ser_fdx=io,irq,mode
 676  * mode: ser#    hardware DCD
 677  *       ser#*   software DCD
 678  *       ser#+   hardware DCD, inverted signal at DCD pin
 679  * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 680  */
 681
 682 static int __init baycom_ser_fdx_setup(char *str)
 683 {
 684         static unsigned nr_dev;
 685         int ints[4];
 686
 687         if (nr_dev >= NR_PORTS)
 688                 return 0;
 689         str = get_options(str, 4, ints);
 690         if (ints[0] < 2)
 691                 return 0;
 692         mode[nr_dev] = str;
 693         iobase[nr_dev] = ints[1];
 694         irq[nr_dev] = ints[2];
 695         if (ints[0] >= 3)
 696                 baud[nr_dev] = ints[3];
 697         nr_dev++;
 698         return 1;
 699 }
 700
 701 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
 702
 703 #endif /* MODULE */
 704 /* --------------------------------------------------------------------- */