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 <linux/hdlcdrv.h>
  79 #include <linux/baycom.h>
  80 #include <linux/jiffies.h>
  81
  82 #include <asm/uaccess.h>
  83 #include <asm/io.h>
  84 #include <asm/irq.h>
  85
  86 /* --------------------------------------------------------------------- */
  87
  88 #define BAYCOM_DEBUG
  89
  90 /* --------------------------------------------------------------------- */
  91
  92 static const char bc_drvname[] = "baycom_ser_fdx";
  93 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  94 KERN_INFO "baycom_ser_fdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
  95
  96 /* --------------------------------------------------------------------- */
  97
  98 #define NR_PORTS 4
  99
 100 static struct net_device *baycom_device[NR_PORTS];
 101
 102 /* --------------------------------------------------------------------- */
 103
 104 #define RBR(iobase) (iobase+0)
 105 #define THR(iobase) (iobase+0)
 106 #define IER(iobase) (iobase+1)
 107 #define IIR(iobase) (iobase+2)
 108 #define FCR(iobase) (iobase+2)
 109 #define LCR(iobase) (iobase+3)
 110 #define MCR(iobase) (iobase+4)
 111 #define LSR(iobase) (iobase+5)
 112 #define MSR(iobase) (iobase+6)
 113 #define SCR(iobase) (iobase+7)
 114 #define DLL(iobase) (iobase+0)
 115 #define DLM(iobase) (iobase+1)
 116
 117 #define SER12_EXTENT 8
 118
 119 /* ---------------------------------------------------------------------- */
 120 /*
 121  * Information that need to be kept for each board.
 122  */
 123
 124 struct baycom_state {
 125         struct hdlcdrv_state hdrv;
 126
 127         unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
 128         int opt_dcd;
 129
 130         struct modem_state {
 131                 unsigned char flags;
 132                 unsigned char ptt;
 133                 unsigned int shreg;
 134                 struct modem_state_ser12 {
 135                         unsigned char tx_bit;
 136                         unsigned char last_rxbit;
 137                         int dcd_sum0, dcd_sum1, dcd_sum2;
 138                         int dcd_time;
 139                         unsigned int pll_time;
 140                         unsigned int txshreg;
 141                 } ser12;
 142         } modem;
 143
 144 #ifdef BAYCOM_DEBUG
 145         struct debug_vals {
 146                 unsigned long last_jiffies;
 147                 unsigned cur_intcnt;
 148                 unsigned last_intcnt;
 149                 int cur_pllcorr;
 150                 int last_pllcorr;
 151         } debug_vals;
 152 #endif /* BAYCOM_DEBUG */
 153 };
 154
 155 /* --------------------------------------------------------------------- */
 156
 157 static inline void baycom_int_freq(struct baycom_state *bc)
 158 {
 159 #ifdef BAYCOM_DEBUG
 160         unsigned long cur_jiffies = jiffies;
 161         /*
 162          * measure the interrupt frequency
 163          */
 164         bc->debug_vals.cur_intcnt++;
 165         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 166                 bc->debug_vals.last_jiffies = cur_jiffies;
 167                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 168                 bc->debug_vals.cur_intcnt = 0;
 169                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 170                 bc->debug_vals.cur_pllcorr = 0;
 171         }
 172 #endif /* BAYCOM_DEBUG */
 173 }
 174
 175 /* --------------------------------------------------------------------- */
 176 /*
 177  * ===================== SER12 specific routines =========================
 178  */
 179
 180 /* --------------------------------------------------------------------- */
 181
 182 static inline void ser12_set_divisor(struct net_device *dev,
 183                                      unsigned int divisor)
 184 {
 185         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 186         outb(divisor, DLL(dev->base_addr));
 187         outb(divisor >> 8, DLM(dev->base_addr));
 188         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 189         /*
 190          * make sure the next interrupt is generated;
 191          * 0 must be used to power the modem; the modem draws its
 192          * power from the TxD line
 193          */
 194         outb(0x00, THR(dev->base_addr));
 195         /*
 196          * it is important not to set the divider while transmitting;
 197          * this reportedly makes some UARTs generating interrupts
 198          * in the hundredthousands per second region
 199          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 200          */
 201 }
 202
 203 /* --------------------------------------------------------------------- */
 204
 205 #if 0
 206 static inline unsigned int hweight16(unsigned int w)
 207         __attribute__ ((unused));
 208 static inline unsigned int hweight8(unsigned int w)
 209         __attribute__ ((unused));
 210
 211 static inline unsigned int hweight16(unsigned int w)
 212 {
 213         unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
 214         res = (res & 0x3333) + ((res >> 2) & 0x3333);
 215         res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
 216         return (res & 0x00FF) + ((res >> 8) & 0x00FF);
 217 }
 218
 219 static inline unsigned int hweight8(unsigned int w)
 220 {
 221         unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
 222         res = (res & 0x33) + ((res >> 2) & 0x33);
 223         return (res & 0x0F) + ((res >> 4) & 0x0F);
 224 }
 225 #endif
 226
 227 /* --------------------------------------------------------------------- */
 228
 229 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
 230 {
 231         int timediff;
 232         int bdus8 = bc->baud_us >> 3;
 233         int bdus4 = bc->baud_us >> 2;
 234         int bdus2 = bc->baud_us >> 1;
 235
 236         timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
 237         while (timediff >= 500000)
 238                 timediff -= 1000000;
 239         while (timediff >= bdus2) {
 240                 timediff -= bc->baud_us;
 241                 bc->modem.ser12.pll_time += bc->baud_us;
 242                 bc->modem.ser12.dcd_time--;
 243                 /* first check if there is room to add a bit */
 244                 if (bc->modem.shreg & 1) {
 245                         hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
 246                         bc->modem.shreg = 0x10000;
 247                 }
 248                 /* add a one bit */
 249                 bc->modem.shreg >>= 1;
 250         }
 251         if (bc->modem.ser12.dcd_time <= 0) {
 252                 if (!bc->opt_dcd)
 253                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 254                                                    bc->modem.ser12.dcd_sum1 +
 255                                                    bc->modem.ser12.dcd_sum2) < 0);
 256                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 257                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 258                 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
 259                 bc->modem.ser12.dcd_time += 120;
 260         }
 261         if (bc->modem.ser12.last_rxbit != curs) {
 262                 bc->modem.ser12.last_rxbit = curs;
 263                 bc->modem.shreg |= 0x10000;
 264                 /* adjust the PLL */
 265                 if (timediff > 0)
 266                         bc->modem.ser12.pll_time += bdus8;
 267                 else
 268                         bc->modem.ser12.pll_time += 1000000 - bdus8;
 269                 /* update DCD */
 270                 if (abs(timediff) > bdus4)
 271                         bc->modem.ser12.dcd_sum0 += 4;
 272                 else
 273                         bc->modem.ser12.dcd_sum0--;
 274 #ifdef BAYCOM_DEBUG
 275                 bc->debug_vals.cur_pllcorr = timediff;
 276 #endif /* BAYCOM_DEBUG */
 277         }
 278         while (bc->modem.ser12.pll_time >= 1000000)
 279                 bc->modem.ser12.pll_time -= 1000000;
 280 }
 281
 282 /* --------------------------------------------------------------------- */
 283
 284 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
 285 {
 286         struct net_device *dev = (struct net_device *)dev_id;
 287         struct baycom_state *bc = netdev_priv(dev);
 288         struct timeval tv;
 289         unsigned char iir, msr;
 290         unsigned int txcount = 0;
 291
 292         if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 293                 return IRQ_NONE;
 294         /* fast way out for shared irq */
 295         if ((iir = inb(IIR(dev->base_addr))) & 1)
 296                 return IRQ_NONE;
 297         /* get current time */
 298         do_gettimeofday(&tv);
 299         msr = inb(MSR(dev->base_addr));
 300         /* delta DCD */
 301         if ((msr & 8) && bc->opt_dcd)
 302                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 303         do {
 304                 switch (iir & 6) {
 305                 case 6:
 306                         inb(LSR(dev->base_addr));
 307                         break;
 308
 309                 case 4:
 310                         inb(RBR(dev->base_addr));
 311                         break;
 312
 313                 case 2:
 314                         /*
 315                          * make sure the next interrupt is generated;
 316                          * 0 must be used to power the modem; the modem draws its
 317                          * power from the TxD line
 318                          */
 319                         outb(0x00, THR(dev->base_addr));
 320                         baycom_int_freq(bc);
 321                         txcount++;
 322                         /*
 323                          * first output the last bit (!) then call HDLC transmitter,
 324                          * since this may take quite long
 325                          */
 326                         if (bc->modem.ptt)
 327                                 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 328                         else
 329                                 outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
 330                         break;
 331
 332                 default:
 333                         msr = inb(MSR(dev->base_addr));
 334                         /* delta DCD */
 335                         if ((msr & 8) && bc->opt_dcd)
 336                                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 337                         break;
 338                 }
 339                 iir = inb(IIR(dev->base_addr));
 340         } while (!(iir & 1));
 341         ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
 342         if (bc->modem.ptt && txcount) {
 343                 if (bc->modem.ser12.txshreg <= 1) {
 344                         bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 345                         if (!hdlcdrv_ptt(&bc->hdrv)) {
 346                                 ser12_set_divisor(dev, 115200/100/8);
 347                                 bc->modem.ptt = 0;
 348                                 goto end_transmit;
 349                         }
 350                 }
 351                 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
 352                 bc->modem.ser12.txshreg >>= 1;
 353         }
 354  end_transmit:
 355         local_irq_enable();
 356         if (!bc->modem.ptt && txcount) {
 357                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 358                 if (hdlcdrv_ptt(&bc->hdrv)) {
 359                         ser12_set_divisor(dev, bc->baud_uartdiv);
 360                         bc->modem.ser12.txshreg = 1;
 361                         bc->modem.ptt = 1;
 362                 }
 363         }
 364         hdlcdrv_transmitter(dev, &bc->hdrv);
 365         hdlcdrv_receiver(dev, &bc->hdrv);
 366         local_irq_disable();
 367         return IRQ_HANDLED;
 368 }
 369
 370 /* --------------------------------------------------------------------- */
 371
 372 enum uart { c_uart_unknown, c_uart_8250,
 373             c_uart_16450, c_uart_16550, c_uart_16550A};
 374 static const char *uart_str[] = {
 375         "unknown", "8250", "16450", "16550", "16550A"
 376 };
 377
 378 static enum uart ser12_check_uart(unsigned int iobase)
 379 {
 380         unsigned char b1,b2,b3;
 381         enum uart u;
 382         enum uart uart_tab[] =
 383                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 384
 385         b1 = inb(MCR(iobase));
 386         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 387         b2 = inb(MSR(iobase));
 388         outb(0x1a, MCR(iobase));
 389         b3 = inb(MSR(iobase)) & 0xf0;
 390         outb(b1, MCR(iobase));                  /* restore old values */
 391         outb(b2, MSR(iobase));
 392         if (b3 != 0x90)
 393                 return c_uart_unknown;
 394         inb(RBR(iobase));
 395         inb(RBR(iobase));
 396         outb(0x01, FCR(iobase));                /* enable FIFOs */
 397         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 398         if (u == c_uart_16450) {
 399                 outb(0x5a, SCR(iobase));
 400                 b1 = inb(SCR(iobase));
 401                 outb(0xa5, SCR(iobase));
 402                 b2 = inb(SCR(iobase));
 403                 if ((b1 != 0x5a) || (b2 != 0xa5))
 404                         u = c_uart_8250;
 405         }
 406         return u;
 407 }
 408
 409 /* --------------------------------------------------------------------- */
 410
 411 static int ser12_open(struct net_device *dev)
 412 {
 413         struct baycom_state *bc = netdev_priv(dev);
 414         enum uart u;
 415
 416         if (!dev || !bc)
 417                 return -ENXIO;
 418         if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
 419             dev->irq < 2 || dev->irq > NR_IRQS) {
 420                 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
 421                                 "or irq (2 <= irq <= %d)\n",
 422                                 0xffff-SER12_EXTENT, NR_IRQS);
 423                 return -ENXIO;
 424         }
 425         if (bc->baud < 300 || bc->baud > 4800) {
 426                 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
 427                                 "(300...4800)\n");
 428                 return -EINVAL;
 429         }
 430         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
 431                 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy \n",
 432                        dev->base_addr);
 433                 return -EACCES;
 434         }
 435         memset(&bc->modem, 0, sizeof(bc->modem));
 436         bc->hdrv.par.bitrate = bc->baud;
 437         bc->baud_us = 1000000/bc->baud;
 438         bc->baud_uartdiv = (115200/8)/bc->baud;
 439         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
 440                 release_region(dev->base_addr, SER12_EXTENT);
 441                 return -EIO;
 442         }
 443         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 444         outb(0x0d, MCR(dev->base_addr));
 445         outb(0, IER(dev->base_addr));
 446         if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
 447                         "baycom_ser_fdx", dev)) {
 448                 release_region(dev->base_addr, SER12_EXTENT);
 449                 return -EBUSY;
 450         }
 451         /*
 452          * set the SIO to 6 Bits/character; during receive,
 453          * the baud rate is set to produce 100 ints/sec
 454          * to feed the channel arbitration process,
 455          * during transmit to baud ints/sec to run
 456          * the transmitter
 457          */
 458         ser12_set_divisor(dev, 115200/100/8);
 459         /*
 460          * enable transmitter empty interrupt and modem status interrupt
 461          */
 462         outb(0x0a, IER(dev->base_addr));
 463         /*
 464          * make sure the next interrupt is generated;
 465          * 0 must be used to power the modem; the modem draws its
 466          * power from the TxD line
 467          */
 468         outb(0x00, THR(dev->base_addr));
 469         hdlcdrv_setdcd(&bc->hdrv, 0);
 470         printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
 471                bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
 472         return 0;
 473 }
 474
 475 /* --------------------------------------------------------------------- */
 476
 477 static int ser12_close(struct net_device *dev)
 478 {
 479         struct baycom_state *bc = netdev_priv(dev);
 480
 481         if (!dev || !bc)
 482                 return -EINVAL;
 483         /*
 484          * disable interrupts
 485          */
 486         outb(0, IER(dev->base_addr));
 487         outb(1, MCR(dev->base_addr));
 488         free_irq(dev->irq, dev);
 489         release_region(dev->base_addr, SER12_EXTENT);
 490         printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
 491                bc_drvname, dev->base_addr, dev->irq);
 492         return 0;
 493 }
 494
 495 /* --------------------------------------------------------------------- */
 496 /*
 497  * ===================== hdlcdrv driver interface =========================
 498  */
 499
 500 /* --------------------------------------------------------------------- */
 501
 502 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 503                         struct hdlcdrv_ioctl *hi, int cmd);
 504
 505 /* --------------------------------------------------------------------- */
 506
 507 static struct hdlcdrv_ops ser12_ops = {
 508         .drvname = bc_drvname,
 509         .drvinfo = bc_drvinfo,
 510         .open    = ser12_open,
 511         .close   = ser12_close,
 512         .ioctl   = baycom_ioctl,
 513 };
 514
 515 /* --------------------------------------------------------------------- */
 516
 517 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 518 {
 519         unsigned int baud;
 520
 521         if (!strncmp(modestr, "ser", 3)) {
 522                 baud = simple_strtoul(modestr+3, NULL, 10);
 523                 if (baud >= 3 && baud <= 48)
 524                         bc->baud = baud*100;
 525         }
 526         if (strchr(modestr, '*'))
 527                 bc->opt_dcd = 0;
 528         else if (strchr(modestr, '+'))
 529                 bc->opt_dcd = -1;
 530         else
 531                 bc->opt_dcd = 1;
 532         return 0;
 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         struct baycom_state *bc;
 541         struct baycom_ioctl bi;
 542
 543         if (!dev)
 544                 return -EINVAL;
 545
 546         bc = netdev_priv(dev);
 547         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 548
 549         if (cmd != SIOCDEVPRIVATE)
 550                 return -ENOIOCTLCMD;
 551         switch (hi->cmd) {
 552         default:
 553                 break;
 554
 555         case HDLCDRVCTL_GETMODE:
 556                 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
 557                 if (bc->opt_dcd <= 0)
 558                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
 559                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 560                         return -EFAULT;
 561                 return 0;
 562
 563         case HDLCDRVCTL_SETMODE:
 564                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 565                         return -EACCES;
 566                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 567                 return baycom_setmode(bc, hi->data.modename);
 568
 569         case HDLCDRVCTL_MODELIST:
 570                 strcpy(hi->data.modename, "ser12,ser3,ser24");
 571                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 572                         return -EFAULT;
 573                 return 0;
 574
 575         case HDLCDRVCTL_MODEMPARMASK:
 576                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 577
 578         }
 579
 580         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 581                 return -EFAULT;
 582         switch (bi.cmd) {
 583         default:
 584                 return -ENOIOCTLCMD;
 585
 586 #ifdef BAYCOM_DEBUG
 587         case BAYCOMCTL_GETDEBUG:
 588                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 589                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 590                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 591                 break;
 592 #endif /* BAYCOM_DEBUG */
 593
 594         }
 595         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 596                 return -EFAULT;
 597         return 0;
 598
 599 }
 600
 601 /* --------------------------------------------------------------------- */
 602
 603 /*
 604  * command line settable parameters
 605  */
 606 static char *mode[NR_PORTS] = { "ser12*", };
 607 static int iobase[NR_PORTS] = { 0x3f8, };
 608 static int irq[NR_PORTS] = { 4, };
 609 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
 610
 611 module_param_array(mode, charp, NULL, 0);
 612 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 613 module_param_array(iobase, int, NULL, 0);
 614 MODULE_PARM_DESC(iobase, "baycom io base address");
 615 module_param_array(irq, int, NULL, 0);
 616 MODULE_PARM_DESC(irq, "baycom irq number");
 617 module_param_array(baud, int, NULL, 0);
 618 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
 619
 620 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 621 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
 622 MODULE_LICENSE("GPL");
 623
 624 /* --------------------------------------------------------------------- */
 625
 626 static int __init init_baycomserfdx(void)
 627 {
 628         int i, found = 0;
 629         char set_hw = 1;
 630
 631         printk(bc_drvinfo);
 632         /*
 633          * register net devices
 634          */
 635         for (i = 0; i < NR_PORTS; i++) {
 636                 struct net_device *dev;
 637                 struct baycom_state *bc;
 638                 char ifname[IFNAMSIZ];
 639
 640                 sprintf(ifname, "bcsf%d", i);
 641
 642                 if (!mode[i])
 643                         set_hw = 0;
 644                 if (!set_hw)
 645                         iobase[i] = irq[i] = 0;
 646
 647                 dev = hdlcdrv_register(&ser12_ops,
 648                                        sizeof(struct baycom_state),
 649                                        ifname, iobase[i], irq[i], 0);
 650                 if (IS_ERR(dev))
 651                         break;
 652
 653                 bc = netdev_priv(dev);
 654                 if (set_hw && baycom_setmode(bc, mode[i]))
 655                         set_hw = 0;
 656                 bc->baud = baud[i];
 657                 found++;
 658                 baycom_device[i] = dev;
 659         }
 660
 661         if (!found)
 662                 return -ENXIO;
 663         return 0;
 664 }
 665
 666 static void __exit cleanup_baycomserfdx(void)
 667 {
 668         int i;
 669
 670         for(i = 0; i < NR_PORTS; i++) {
 671                 struct net_device *dev = baycom_device[i];
 672                 if (dev)
 673                         hdlcdrv_unregister(dev);
 674         }
 675 }
 676
 677 module_init(init_baycomserfdx);
 678 module_exit(cleanup_baycomserfdx);
 679
 680 /* --------------------------------------------------------------------- */
 681
 682 #ifndef MODULE
 683
 684 /*
 685  * format: baycom_ser_fdx=io,irq,mode
 686  * mode: ser#    hardware DCD
 687  *       ser#*   software DCD
 688  *       ser#+   hardware DCD, inverted signal at DCD pin
 689  * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 690  */
 691
 692 static int __init baycom_ser_fdx_setup(char *str)
 693 {
 694         static unsigned nr_dev;
 695         int ints[4];
 696
 697         if (nr_dev >= NR_PORTS)
 698                 return 0;
 699         str = get_options(str, 4, ints);
 700         if (ints[0] < 2)
 701                 return 0;
 702         mode[nr_dev] = str;
 703         iobase[nr_dev] = ints[1];
 704         irq[nr_dev] = ints[2];
 705         if (ints[0] >= 3)
 706                 baud[nr_dev] = ints[3];
 707         nr_dev++;
 708         return 1;
 709 }
 710
 711 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
 712
 713 #endif /* MODULE */
 714 /* --------------------------------------------------------------------- */