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 contiguous 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/capability.h>
  75 #include <linux/module.h>
  76 #include <linux/ioport.h>
  77 #include <linux/string.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/hdlcdrv.h>
  81 #include <linux/baycom.h>
  82 #include <linux/jiffies.h>
  83
  84 #include <asm/uaccess.h>
  85 #include <asm/io.h>
  86 #include <asm/irq.h>
  87
  88 /* --------------------------------------------------------------------- */
  89
  90 #define BAYCOM_DEBUG
  91
  92 /* --------------------------------------------------------------------- */
  93
  94 static const char bc_drvname[] = "baycom_ser_fdx";
  95 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  96 "baycom_ser_fdx: version 0.10\n";
  97
  98 /* --------------------------------------------------------------------- */
  99
 100 #define NR_PORTS 4
 101
 102 static struct net_device *baycom_device[NR_PORTS];
 103
 104 /* --------------------------------------------------------------------- */
 105
 106 #define RBR(iobase) (iobase+0)
 107 #define THR(iobase) (iobase+0)
 108 #define IER(iobase) (iobase+1)
 109 #define IIR(iobase) (iobase+2)
 110 #define FCR(iobase) (iobase+2)
 111 #define LCR(iobase) (iobase+3)
 112 #define MCR(iobase) (iobase+4)
 113 #define LSR(iobase) (iobase+5)
 114 #define MSR(iobase) (iobase+6)
 115 #define SCR(iobase) (iobase+7)
 116 #define DLL(iobase) (iobase+0)
 117 #define DLM(iobase) (iobase+1)
 118
 119 #define SER12_EXTENT 8
 120
 121 /* ---------------------------------------------------------------------- */
 122 /*
 123  * Information that need to be kept for each board.
 124  */
 125
 126 struct baycom_state {
 127         struct hdlcdrv_state hdrv;
 128
 129         unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
 130         int opt_dcd;
 131
 132         struct modem_state {
 133                 unsigned char flags;
 134                 unsigned char ptt;
 135                 unsigned int shreg;
 136                 struct modem_state_ser12 {
 137                         unsigned char tx_bit;
 138                         unsigned char last_rxbit;
 139                         int dcd_sum0, dcd_sum1, dcd_sum2;
 140                         int dcd_time;
 141                         unsigned int pll_time;
 142                         unsigned int txshreg;
 143                 } ser12;
 144         } modem;
 145
 146 #ifdef BAYCOM_DEBUG
 147         struct debug_vals {
 148                 unsigned long last_jiffies;
 149                 unsigned cur_intcnt;
 150                 unsigned last_intcnt;
 151                 int cur_pllcorr;
 152                 int last_pllcorr;
 153         } debug_vals;
 154 #endif /* BAYCOM_DEBUG */
 155 };
 156
 157 /* --------------------------------------------------------------------- */
 158
 159 static inline void baycom_int_freq(struct baycom_state *bc)
 160 {
 161 #ifdef BAYCOM_DEBUG
 162         unsigned long cur_jiffies = jiffies;
 163         /*
 164          * measure the interrupt frequency
 165          */
 166         bc->debug_vals.cur_intcnt++;
 167         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 168                 bc->debug_vals.last_jiffies = cur_jiffies;
 169                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 170                 bc->debug_vals.cur_intcnt = 0;
 171                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 172                 bc->debug_vals.cur_pllcorr = 0;
 173         }
 174 #endif /* BAYCOM_DEBUG */
 175 }
 176
 177 /* --------------------------------------------------------------------- */
 178 /*
 179  * ===================== SER12 specific routines =========================
 180  */
 181
 182 /* --------------------------------------------------------------------- */
 183
 184 static inline void ser12_set_divisor(struct net_device *dev,
 185                                      unsigned int divisor)
 186 {
 187         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 188         outb(divisor, DLL(dev->base_addr));
 189         outb(divisor >> 8, DLM(dev->base_addr));
 190         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 191         /*
 192          * make sure the next interrupt is generated;
 193          * 0 must be used to power the modem; the modem draws its
 194          * power from the TxD line
 195          */
 196         outb(0x00, THR(dev->base_addr));
 197         /*
 198          * it is important not to set the divider while transmitting;
 199          * this reportedly makes some UARTs generating interrupts
 200          * in the hundredthousands per second region
 201          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 202          */
 203 }
 204
 205 /* --------------------------------------------------------------------- */
 206
 207 #if 0
 208 static inline unsigned int hweight16(unsigned int w)
 209         __attribute__ ((unused));
 210 static inline unsigned int hweight8(unsigned int w)
 211         __attribute__ ((unused));
 212
 213 static inline unsigned int hweight16(unsigned int w)
 214 {
 215         unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
 216         res = (res & 0x3333) + ((res >> 2) & 0x3333);
 217         res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
 218         return (res & 0x00FF) + ((res >> 8) & 0x00FF);
 219 }
 220
 221 static inline unsigned int hweight8(unsigned int w)
 222 {
 223         unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
 224         res = (res & 0x33) + ((res >> 2) & 0x33);
 225         return (res & 0x0F) + ((res >> 4) & 0x0F);
 226 }
 227 #endif
 228
 229 /* --------------------------------------------------------------------- */
 230
 231 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
 232 {
 233         int timediff;
 234         int bdus8 = bc->baud_us >> 3;
 235         int bdus4 = bc->baud_us >> 2;
 236         int bdus2 = bc->baud_us >> 1;
 237
 238         timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
 239         while (timediff >= 500000)
 240                 timediff -= 1000000;
 241         while (timediff >= bdus2) {
 242                 timediff -= bc->baud_us;
 243                 bc->modem.ser12.pll_time += bc->baud_us;
 244                 bc->modem.ser12.dcd_time--;
 245                 /* first check if there is room to add a bit */
 246                 if (bc->modem.shreg & 1) {
 247                         hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
 248                         bc->modem.shreg = 0x10000;
 249                 }
 250                 /* add a one bit */
 251                 bc->modem.shreg >>= 1;
 252         }
 253         if (bc->modem.ser12.dcd_time <= 0) {
 254                 if (!bc->opt_dcd)
 255                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 256                                                    bc->modem.ser12.dcd_sum1 +
 257                                                    bc->modem.ser12.dcd_sum2) < 0);
 258                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 259                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 260                 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
 261                 bc->modem.ser12.dcd_time += 120;
 262         }
 263         if (bc->modem.ser12.last_rxbit != curs) {
 264                 bc->modem.ser12.last_rxbit = curs;
 265                 bc->modem.shreg |= 0x10000;
 266                 /* adjust the PLL */
 267                 if (timediff > 0)
 268                         bc->modem.ser12.pll_time += bdus8;
 269                 else
 270                         bc->modem.ser12.pll_time += 1000000 - bdus8;
 271                 /* update DCD */
 272                 if (abs(timediff) > bdus4)
 273                         bc->modem.ser12.dcd_sum0 += 4;
 274                 else
 275                         bc->modem.ser12.dcd_sum0--;
 276 #ifdef BAYCOM_DEBUG
 277                 bc->debug_vals.cur_pllcorr = timediff;
 278 #endif /* BAYCOM_DEBUG */
 279         }
 280         while (bc->modem.ser12.pll_time >= 1000000)
 281                 bc->modem.ser12.pll_time -= 1000000;
 282 }
 283
 284 /* --------------------------------------------------------------------- */
 285
 286 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
 287 {
 288         struct net_device *dev = (struct net_device *)dev_id;
 289         struct baycom_state *bc = netdev_priv(dev);
 290         struct timeval tv;
 291         unsigned char iir, msr;
 292         unsigned int txcount = 0;
 293
 294         if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 295                 return IRQ_NONE;
 296         /* fast way out for shared irq */
 297         if ((iir = inb(IIR(dev->base_addr))) & 1)
 298                 return IRQ_NONE;
 299         /* get current time */
 300         do_gettimeofday(&tv);
 301         msr = inb(MSR(dev->base_addr));
 302         /* delta DCD */
 303         if ((msr & 8) && bc->opt_dcd)
 304                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 305         do {
 306                 switch (iir & 6) {
 307                 case 6:
 308                         inb(LSR(dev->base_addr));
 309                         break;
 310
 311                 case 4:
 312                         inb(RBR(dev->base_addr));
 313                         break;
 314
 315                 case 2:
 316                         /*
 317                          * make sure the next interrupt is generated;
 318                          * 0 must be used to power the modem; the modem draws its
 319                          * power from the TxD line
 320                          */
 321                         outb(0x00, THR(dev->base_addr));
 322                         baycom_int_freq(bc);
 323                         txcount++;
 324                         /*
 325                          * first output the last bit (!) then call HDLC transmitter,
 326                          * since this may take quite long
 327                          */
 328                         if (bc->modem.ptt)
 329                                 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 330                         else
 331                                 outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
 332                         break;
 333
 334                 default:
 335                         msr = inb(MSR(dev->base_addr));
 336                         /* delta DCD */
 337                         if ((msr & 8) && bc->opt_dcd)
 338                                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 339                         break;
 340                 }
 341                 iir = inb(IIR(dev->base_addr));
 342         } while (!(iir & 1));
 343         ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
 344         if (bc->modem.ptt && txcount) {
 345                 if (bc->modem.ser12.txshreg <= 1) {
 346                         bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 347                         if (!hdlcdrv_ptt(&bc->hdrv)) {
 348                                 ser12_set_divisor(dev, 115200/100/8);
 349                                 bc->modem.ptt = 0;
 350                                 goto end_transmit;
 351                         }
 352                 }
 353                 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
 354                 bc->modem.ser12.txshreg >>= 1;
 355         }
 356  end_transmit:
 357         local_irq_enable();
 358         if (!bc->modem.ptt && txcount) {
 359                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 360                 if (hdlcdrv_ptt(&bc->hdrv)) {
 361                         ser12_set_divisor(dev, bc->baud_uartdiv);
 362                         bc->modem.ser12.txshreg = 1;
 363                         bc->modem.ptt = 1;
 364                 }
 365         }
 366         hdlcdrv_transmitter(dev, &bc->hdrv);
 367         hdlcdrv_receiver(dev, &bc->hdrv);
 368         local_irq_disable();
 369         return IRQ_HANDLED;
 370 }
 371
 372 /* --------------------------------------------------------------------- */
 373
 374 enum uart { c_uart_unknown, c_uart_8250,
 375             c_uart_16450, c_uart_16550, c_uart_16550A};
 376 static const char *uart_str[] = {
 377         "unknown", "8250", "16450", "16550", "16550A"
 378 };
 379
 380 static enum uart ser12_check_uart(unsigned int iobase)
 381 {
 382         unsigned char b1,b2,b3;
 383         enum uart u;
 384         enum uart uart_tab[] =
 385                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 386
 387         b1 = inb(MCR(iobase));
 388         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 389         b2 = inb(MSR(iobase));
 390         outb(0x1a, MCR(iobase));
 391         b3 = inb(MSR(iobase)) & 0xf0;
 392         outb(b1, MCR(iobase));                  /* restore old values */
 393         outb(b2, MSR(iobase));
 394         if (b3 != 0x90)
 395                 return c_uart_unknown;
 396         inb(RBR(iobase));
 397         inb(RBR(iobase));
 398         outb(0x01, FCR(iobase));                /* enable FIFOs */
 399         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 400         if (u == c_uart_16450) {
 401                 outb(0x5a, SCR(iobase));
 402                 b1 = inb(SCR(iobase));
 403                 outb(0xa5, SCR(iobase));
 404                 b2 = inb(SCR(iobase));
 405                 if ((b1 != 0x5a) || (b2 != 0xa5))
 406                         u = c_uart_8250;
 407         }
 408         return u;
 409 }
 410
 411 /* --------------------------------------------------------------------- */
 412
 413 static int ser12_open(struct net_device *dev)
 414 {
 415         struct baycom_state *bc = netdev_priv(dev);
 416         enum uart u;
 417
 418         if (!dev || !bc)
 419                 return -ENXIO;
 420         if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
 421             dev->irq < 2 || dev->irq > nr_irqs) {
 422                 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
 423                                 "or irq (2 <= irq <= %d)\n",
 424                                 0xffff-SER12_EXTENT, nr_irqs);
 425                 return -ENXIO;
 426         }
 427         if (bc->baud < 300 || bc->baud > 4800) {
 428                 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
 429                                 "(300...4800)\n");
 430                 return -EINVAL;
 431         }
 432         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
 433                 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
 434                        dev->base_addr);
 435                 return -EACCES;
 436         }
 437         memset(&bc->modem, 0, sizeof(bc->modem));
 438         bc->hdrv.par.bitrate = bc->baud;
 439         bc->baud_us = 1000000/bc->baud;
 440         bc->baud_uartdiv = (115200/8)/bc->baud;
 441         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
 442                 release_region(dev->base_addr, SER12_EXTENT);
 443                 return -EIO;
 444         }
 445         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 446         outb(0x0d, MCR(dev->base_addr));
 447         outb(0, IER(dev->base_addr));
 448         if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
 449                         "baycom_ser_fdx", dev)) {
 450                 release_region(dev->base_addr, SER12_EXTENT);
 451                 return -EBUSY;
 452         }
 453         /*
 454          * set the SIO to 6 Bits/character; during receive,
 455          * the baud rate is set to produce 100 ints/sec
 456          * to feed the channel arbitration process,
 457          * during transmit to baud ints/sec to run
 458          * the transmitter
 459          */
 460         ser12_set_divisor(dev, 115200/100/8);
 461         /*
 462          * enable transmitter empty interrupt and modem status interrupt
 463          */
 464         outb(0x0a, IER(dev->base_addr));
 465         /*
 466          * make sure the next interrupt is generated;
 467          * 0 must be used to power the modem; the modem draws its
 468          * power from the TxD line
 469          */
 470         outb(0x00, THR(dev->base_addr));
 471         hdlcdrv_setdcd(&bc->hdrv, 0);
 472         printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
 473                bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
 474         return 0;
 475 }
 476
 477 /* --------------------------------------------------------------------- */
 478
 479 static int ser12_close(struct net_device *dev)
 480 {
 481         struct baycom_state *bc = netdev_priv(dev);
 482
 483         if (!dev || !bc)
 484                 return -EINVAL;
 485         /*
 486          * disable interrupts
 487          */
 488         outb(0, IER(dev->base_addr));
 489         outb(1, MCR(dev->base_addr));
 490         free_irq(dev->irq, dev);
 491         release_region(dev->base_addr, SER12_EXTENT);
 492         printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
 493                bc_drvname, dev->base_addr, dev->irq);
 494         return 0;
 495 }
 496
 497 /* --------------------------------------------------------------------- */
 498 /*
 499  * ===================== hdlcdrv driver interface =========================
 500  */
 501
 502 /* --------------------------------------------------------------------- */
 503
 504 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 505                         struct hdlcdrv_ioctl *hi, int cmd);
 506
 507 /* --------------------------------------------------------------------- */
 508
 509 static struct hdlcdrv_ops ser12_ops = {
 510         .drvname = bc_drvname,
 511         .drvinfo = bc_drvinfo,
 512         .open    = ser12_open,
 513         .close   = ser12_close,
 514         .ioctl   = baycom_ioctl,
 515 };
 516
 517 /* --------------------------------------------------------------------- */
 518
 519 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 520 {
 521         unsigned int baud;
 522
 523         if (!strncmp(modestr, "ser", 3)) {
 524                 baud = simple_strtoul(modestr+3, NULL, 10);
 525                 if (baud >= 3 && baud <= 48)
 526                         bc->baud = baud*100;
 527         }
 528         if (strchr(modestr, '*'))
 529                 bc->opt_dcd = 0;
 530         else if (strchr(modestr, '+'))
 531                 bc->opt_dcd = -1;
 532         else
 533                 bc->opt_dcd = 1;
 534         return 0;
 535 }
 536
 537 /* --------------------------------------------------------------------- */
 538
 539 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 540                         struct hdlcdrv_ioctl *hi, int cmd)
 541 {
 542         struct baycom_state *bc;
 543         struct baycom_ioctl bi;
 544
 545         if (!dev)
 546                 return -EINVAL;
 547
 548         bc = netdev_priv(dev);
 549         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 550
 551         if (cmd != SIOCDEVPRIVATE)
 552                 return -ENOIOCTLCMD;
 553         switch (hi->cmd) {
 554         default:
 555                 break;
 556
 557         case HDLCDRVCTL_GETMODE:
 558                 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
 559                 if (bc->opt_dcd <= 0)
 560                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
 561                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 562                         return -EFAULT;
 563                 return 0;
 564
 565         case HDLCDRVCTL_SETMODE:
 566                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 567                         return -EACCES;
 568                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 569                 return baycom_setmode(bc, hi->data.modename);
 570
 571         case HDLCDRVCTL_MODELIST:
 572                 strcpy(hi->data.modename, "ser12,ser3,ser24");
 573                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 574                         return -EFAULT;
 575                 return 0;
 576
 577         case HDLCDRVCTL_MODEMPARMASK:
 578                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 579
 580         }
 581
 582         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 583                 return -EFAULT;
 584         switch (bi.cmd) {
 585         default:
 586                 return -ENOIOCTLCMD;
 587
 588 #ifdef BAYCOM_DEBUG
 589         case BAYCOMCTL_GETDEBUG:
 590                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 591                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 592                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 593                 break;
 594 #endif /* BAYCOM_DEBUG */
 595
 596         }
 597         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 598                 return -EFAULT;
 599         return 0;
 600
 601 }
 602
 603 /* --------------------------------------------------------------------- */
 604
 605 /*
 606  * command line settable parameters
 607  */
 608 static char *mode[NR_PORTS] = { "ser12*", };
 609 static int iobase[NR_PORTS] = { 0x3f8, };
 610 static int irq[NR_PORTS] = { 4, };
 611 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
 612
 613 module_param_array(mode, charp, NULL, 0);
 614 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 615 module_param_array(iobase, int, NULL, 0);
 616 MODULE_PARM_DESC(iobase, "baycom io base address");
 617 module_param_array(irq, int, NULL, 0);
 618 MODULE_PARM_DESC(irq, "baycom irq number");
 619 module_param_array(baud, int, NULL, 0);
 620 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
 621
 622 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 623 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
 624 MODULE_LICENSE("GPL");
 625
 626 /* --------------------------------------------------------------------- */
 627
 628 static int __init init_baycomserfdx(void)
 629 {
 630         int i, found = 0;
 631         char set_hw = 1;
 632
 633         printk(bc_drvinfo);
 634         /*
 635          * register net devices
 636          */
 637         for (i = 0; i < NR_PORTS; i++) {
 638                 struct net_device *dev;
 639                 struct baycom_state *bc;
 640                 char ifname[IFNAMSIZ];
 641
 642                 sprintf(ifname, "bcsf%d", i);
 643
 644                 if (!mode[i])
 645                         set_hw = 0;
 646                 if (!set_hw)
 647                         iobase[i] = irq[i] = 0;
 648
 649                 dev = hdlcdrv_register(&ser12_ops,
 650                                        sizeof(struct baycom_state),
 651                                        ifname, iobase[i], irq[i], 0);
 652                 if (IS_ERR(dev))
 653                         break;
 654
 655                 bc = netdev_priv(dev);
 656                 if (set_hw && baycom_setmode(bc, mode[i]))
 657                         set_hw = 0;
 658                 bc->baud = baud[i];
 659                 found++;
 660                 baycom_device[i] = dev;
 661         }
 662
 663         if (!found)
 664                 return -ENXIO;
 665         return 0;
 666 }
 667
 668 static void __exit cleanup_baycomserfdx(void)
 669 {
 670         int i;
 671
 672         for(i = 0; i < NR_PORTS; i++) {
 673                 struct net_device *dev = baycom_device[i];
 674                 if (dev)
 675                         hdlcdrv_unregister(dev);
 676         }
 677 }
 678
 679 module_init(init_baycomserfdx);
 680 module_exit(cleanup_baycomserfdx);
 681
 682 /* --------------------------------------------------------------------- */
 683
 684 #ifndef MODULE
 685
 686 /*
 687  * format: baycom_ser_fdx=io,irq,mode
 688  * mode: ser#    hardware DCD
 689  *       ser#*   software DCD
 690  *       ser#+   hardware DCD, inverted signal at DCD pin
 691  * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 692  */
 693
 694 static int __init baycom_ser_fdx_setup(char *str)
 695 {
 696         static unsigned nr_dev;
 697         int ints[4];
 698
 699         if (nr_dev >= NR_PORTS)
 700                 return 0;
 701         str = get_options(str, 4, ints);
 702         if (ints[0] < 2)
 703                 return 0;
 704         mode[nr_dev] = str;
 705         iobase[nr_dev] = ints[1];
 706         irq[nr_dev] = ints[2];
 707         if (ints[0] >= 3)
 708                 baud[nr_dev] = ints[3];
 709         nr_dev++;
 710         return 1;
 711 }
 712
 713 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
 714
 715 #endif /* MODULE */
 716 /* --------------------------------------------------------------------- */