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