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 #include <linux/time64.h>
  84
  85 #include <linux/uaccess.h>
  86 #include <asm/io.h>
  87 #include <asm/irq.h>
  88
  89 /* --------------------------------------------------------------------- */
  90
  91 #define BAYCOM_DEBUG
  92
  93 /* --------------------------------------------------------------------- */
  94
  95 static const char bc_drvname[] = "baycom_ser_fdx";
  96 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  97 "baycom_ser_fdx: version 0.10\n";
  98
  99 /* --------------------------------------------------------------------- */
 100
 101 #define NR_PORTS 4
 102
 103 static struct net_device *baycom_device[NR_PORTS];
 104
 105 /* --------------------------------------------------------------------- */
 106
 107 #define RBR(iobase) (iobase+0)
 108 #define THR(iobase) (iobase+0)
 109 #define IER(iobase) (iobase+1)
 110 #define IIR(iobase) (iobase+2)
 111 #define FCR(iobase) (iobase+2)
 112 #define LCR(iobase) (iobase+3)
 113 #define MCR(iobase) (iobase+4)
 114 #define LSR(iobase) (iobase+5)
 115 #define MSR(iobase) (iobase+6)
 116 #define SCR(iobase) (iobase+7)
 117 #define DLL(iobase) (iobase+0)
 118 #define DLM(iobase) (iobase+1)
 119
 120 #define SER12_EXTENT 8
 121
 122 /* ---------------------------------------------------------------------- */
 123 /*
 124  * Information that need to be kept for each board.
 125  */
 126
 127 struct baycom_state {
 128         struct hdlcdrv_state hdrv;
 129
 130         unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
 131         int opt_dcd;
 132
 133         struct modem_state {
 134                 unsigned char flags;
 135                 unsigned char ptt;
 136                 unsigned int shreg;
 137                 struct modem_state_ser12 {
 138                         unsigned char tx_bit;
 139                         unsigned char last_rxbit;
 140                         int dcd_sum0, dcd_sum1, dcd_sum2;
 141                         int dcd_time;
 142                         unsigned int pll_time;
 143                         unsigned int txshreg;
 144                 } ser12;
 145         } modem;
 146
 147 #ifdef BAYCOM_DEBUG
 148         struct debug_vals {
 149                 unsigned long last_jiffies;
 150                 unsigned cur_intcnt;
 151                 unsigned last_intcnt;
 152                 int cur_pllcorr;
 153                 int last_pllcorr;
 154         } debug_vals;
 155 #endif /* BAYCOM_DEBUG */
 156 };
 157
 158 /* --------------------------------------------------------------------- */
 159
 160 static inline void baycom_int_freq(struct baycom_state *bc)
 161 {
 162 #ifdef BAYCOM_DEBUG
 163         unsigned long cur_jiffies = jiffies;
 164         /*
 165          * measure the interrupt frequency
 166          */
 167         bc->debug_vals.cur_intcnt++;
 168         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 169                 bc->debug_vals.last_jiffies = cur_jiffies;
 170                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 171                 bc->debug_vals.cur_intcnt = 0;
 172                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 173                 bc->debug_vals.cur_pllcorr = 0;
 174         }
 175 #endif /* BAYCOM_DEBUG */
 176 }
 177
 178 /* --------------------------------------------------------------------- */
 179 /*
 180  * ===================== SER12 specific routines =========================
 181  */
 182
 183 /* --------------------------------------------------------------------- */
 184
 185 static inline void ser12_set_divisor(struct net_device *dev,
 186                                      unsigned int divisor)
 187 {
 188         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
 189         outb(divisor, DLL(dev->base_addr));
 190         outb(divisor >> 8, DLM(dev->base_addr));
 191         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
 192         /*
 193          * make sure the next interrupt is generated;
 194          * 0 must be used to power the modem; the modem draws its
 195          * power from the TxD line
 196          */
 197         outb(0x00, THR(dev->base_addr));
 198         /*
 199          * it is important not to set the divider while transmitting;
 200          * this reportedly makes some UARTs generating interrupts
 201          * in the hundredthousands per second region
 202          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
 203          */
 204 }
 205
 206 /* --------------------------------------------------------------------- */
 207
 208 #if 0
 209 static inline unsigned int hweight16(unsigned int w)
 210         __attribute__ ((unused));
 211 static inline unsigned int hweight8(unsigned int w)
 212         __attribute__ ((unused));
 213
 214 static inline unsigned int hweight16(unsigned int w)
 215 {
 216         unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
 217         res = (res & 0x3333) + ((res >> 2) & 0x3333);
 218         res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
 219         return (res & 0x00FF) + ((res >> 8) & 0x00FF);
 220 }
 221
 222 static inline unsigned int hweight8(unsigned int w)
 223 {
 224         unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
 225         res = (res & 0x33) + ((res >> 2) & 0x33);
 226         return (res & 0x0F) + ((res >> 4) & 0x0F);
 227 }
 228 #endif
 229
 230 /* --------------------------------------------------------------------- */
 231
 232 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
 233 {
 234         int timediff;
 235         int bdus8 = bc->baud_us >> 3;
 236         int bdus4 = bc->baud_us >> 2;
 237         int bdus2 = bc->baud_us >> 1;
 238
 239         timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
 240                                         bc->modem.ser12.pll_time;
 241         while (timediff >= 500000)
 242                 timediff -= 1000000;
 243         while (timediff >= bdus2) {
 244                 timediff -= bc->baud_us;
 245                 bc->modem.ser12.pll_time += bc->baud_us;
 246                 bc->modem.ser12.dcd_time--;
 247                 /* first check if there is room to add a bit */
 248                 if (bc->modem.shreg & 1) {
 249                         hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
 250                         bc->modem.shreg = 0x10000;
 251                 }
 252                 /* add a one bit */
 253                 bc->modem.shreg >>= 1;
 254         }
 255         if (bc->modem.ser12.dcd_time <= 0) {
 256                 if (!bc->opt_dcd)
 257                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
 258                                                    bc->modem.ser12.dcd_sum1 +
 259                                                    bc->modem.ser12.dcd_sum2) < 0);
 260                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
 261                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
 262                 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
 263                 bc->modem.ser12.dcd_time += 120;
 264         }
 265         if (bc->modem.ser12.last_rxbit != curs) {
 266                 bc->modem.ser12.last_rxbit = curs;
 267                 bc->modem.shreg |= 0x10000;
 268                 /* adjust the PLL */
 269                 if (timediff > 0)
 270                         bc->modem.ser12.pll_time += bdus8;
 271                 else
 272                         bc->modem.ser12.pll_time += 1000000 - bdus8;
 273                 /* update DCD */
 274                 if (abs(timediff) > bdus4)
 275                         bc->modem.ser12.dcd_sum0 += 4;
 276                 else
 277                         bc->modem.ser12.dcd_sum0--;
 278 #ifdef BAYCOM_DEBUG
 279                 bc->debug_vals.cur_pllcorr = timediff;
 280 #endif /* BAYCOM_DEBUG */
 281         }
 282         while (bc->modem.ser12.pll_time >= 1000000)
 283                 bc->modem.ser12.pll_time -= 1000000;
 284 }
 285
 286 /* --------------------------------------------------------------------- */
 287
 288 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
 289 {
 290         struct net_device *dev = (struct net_device *)dev_id;
 291         struct baycom_state *bc = netdev_priv(dev);
 292         struct timespec64 ts;
 293         unsigned char iir, msr;
 294         unsigned int txcount = 0;
 295
 296         if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
 297                 return IRQ_NONE;
 298         /* fast way out for shared irq */
 299         if ((iir = inb(IIR(dev->base_addr))) & 1)
 300                 return IRQ_NONE;
 301         /* get current time */
 302         ktime_get_ts64(&ts);
 303         msr = inb(MSR(dev->base_addr));
 304         /* delta DCD */
 305         if ((msr & 8) && bc->opt_dcd)
 306                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 307         do {
 308                 switch (iir & 6) {
 309                 case 6:
 310                         inb(LSR(dev->base_addr));
 311                         break;
 312
 313                 case 4:
 314                         inb(RBR(dev->base_addr));
 315                         break;
 316
 317                 case 2:
 318                         /*
 319                          * make sure the next interrupt is generated;
 320                          * 0 must be used to power the modem; the modem draws its
 321                          * power from the TxD line
 322                          */
 323                         outb(0x00, THR(dev->base_addr));
 324                         baycom_int_freq(bc);
 325                         txcount++;
 326                         /*
 327                          * first output the last bit (!) then call HDLC transmitter,
 328                          * since this may take quite long
 329                          */
 330                         if (bc->modem.ptt)
 331                                 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
 332                         else
 333                                 outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
 334                         break;
 335
 336                 default:
 337                         msr = inb(MSR(dev->base_addr));
 338                         /* delta DCD */
 339                         if ((msr & 8) && bc->opt_dcd)
 340                                 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
 341                         break;
 342                 }
 343                 iir = inb(IIR(dev->base_addr));
 344         } while (!(iir & 1));
 345         ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
 346         if (bc->modem.ptt && txcount) {
 347                 if (bc->modem.ser12.txshreg <= 1) {
 348                         bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
 349                         if (!hdlcdrv_ptt(&bc->hdrv)) {
 350                                 ser12_set_divisor(dev, 115200/100/8);
 351                                 bc->modem.ptt = 0;
 352                                 goto end_transmit;
 353                         }
 354                 }
 355                 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
 356                 bc->modem.ser12.txshreg >>= 1;
 357         }
 358  end_transmit:
 359         local_irq_enable();
 360         if (!bc->modem.ptt && txcount) {
 361                 hdlcdrv_arbitrate(dev, &bc->hdrv);
 362                 if (hdlcdrv_ptt(&bc->hdrv)) {
 363                         ser12_set_divisor(dev, bc->baud_uartdiv);
 364                         bc->modem.ser12.txshreg = 1;
 365                         bc->modem.ptt = 1;
 366                 }
 367         }
 368         hdlcdrv_transmitter(dev, &bc->hdrv);
 369         hdlcdrv_receiver(dev, &bc->hdrv);
 370         local_irq_disable();
 371         return IRQ_HANDLED;
 372 }
 373
 374 /* --------------------------------------------------------------------- */
 375
 376 enum uart { c_uart_unknown, c_uart_8250,
 377             c_uart_16450, c_uart_16550, c_uart_16550A};
 378 static const char *uart_str[] = {
 379         "unknown", "8250", "16450", "16550", "16550A"
 380 };
 381
 382 static enum uart ser12_check_uart(unsigned int iobase)
 383 {
 384         unsigned char b1,b2,b3;
 385         enum uart u;
 386         enum uart uart_tab[] =
 387                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
 388
 389         b1 = inb(MCR(iobase));
 390         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 391         b2 = inb(MSR(iobase));
 392         outb(0x1a, MCR(iobase));
 393         b3 = inb(MSR(iobase)) & 0xf0;
 394         outb(b1, MCR(iobase));                  /* restore old values */
 395         outb(b2, MSR(iobase));
 396         if (b3 != 0x90)
 397                 return c_uart_unknown;
 398         inb(RBR(iobase));
 399         inb(RBR(iobase));
 400         outb(0x01, FCR(iobase));                /* enable FIFOs */
 401         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 402         if (u == c_uart_16450) {
 403                 outb(0x5a, SCR(iobase));
 404                 b1 = inb(SCR(iobase));
 405                 outb(0xa5, SCR(iobase));
 406                 b2 = inb(SCR(iobase));
 407                 if ((b1 != 0x5a) || (b2 != 0xa5))
 408                         u = c_uart_8250;
 409         }
 410         return u;
 411 }
 412
 413 /* --------------------------------------------------------------------- */
 414
 415 static int ser12_open(struct net_device *dev)
 416 {
 417         struct baycom_state *bc = netdev_priv(dev);
 418         enum uart u;
 419
 420         if (!dev || !bc)
 421                 return -ENXIO;
 422         if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
 423             dev->irq < 2 || dev->irq > nr_irqs) {
 424                 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
 425                                 "or irq (2 <= irq <= %d)\n",
 426                                 0xffff-SER12_EXTENT, nr_irqs);
 427                 return -ENXIO;
 428         }
 429         if (bc->baud < 300 || bc->baud > 4800) {
 430                 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
 431                                 "(300...4800)\n");
 432                 return -EINVAL;
 433         }
 434         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
 435                 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
 436                        dev->base_addr);
 437                 return -EACCES;
 438         }
 439         memset(&bc->modem, 0, sizeof(bc->modem));
 440         bc->hdrv.par.bitrate = bc->baud;
 441         bc->baud_us = 1000000/bc->baud;
 442         bc->baud_uartdiv = (115200/8)/bc->baud;
 443         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
 444                 release_region(dev->base_addr, SER12_EXTENT);
 445                 return -EIO;
 446         }
 447         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
 448         outb(0x0d, MCR(dev->base_addr));
 449         outb(0, IER(dev->base_addr));
 450         if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED,
 451                         "baycom_ser_fdx", dev)) {
 452                 release_region(dev->base_addr, SER12_EXTENT);
 453                 return -EBUSY;
 454         }
 455         /*
 456          * set the SIO to 6 Bits/character; during receive,
 457          * the baud rate is set to produce 100 ints/sec
 458          * to feed the channel arbitration process,
 459          * during transmit to baud ints/sec to run
 460          * the transmitter
 461          */
 462         ser12_set_divisor(dev, 115200/100/8);
 463         /*
 464          * enable transmitter empty interrupt and modem status interrupt
 465          */
 466         outb(0x0a, IER(dev->base_addr));
 467         /*
 468          * make sure the next interrupt is generated;
 469          * 0 must be used to power the modem; the modem draws its
 470          * power from the TxD line
 471          */
 472         outb(0x00, THR(dev->base_addr));
 473         hdlcdrv_setdcd(&bc->hdrv, 0);
 474         printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
 475                bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
 476         return 0;
 477 }
 478
 479 /* --------------------------------------------------------------------- */
 480
 481 static int ser12_close(struct net_device *dev)
 482 {
 483         struct baycom_state *bc = netdev_priv(dev);
 484
 485         if (!dev || !bc)
 486                 return -EINVAL;
 487         /*
 488          * disable interrupts
 489          */
 490         outb(0, IER(dev->base_addr));
 491         outb(1, MCR(dev->base_addr));
 492         free_irq(dev->irq, dev);
 493         release_region(dev->base_addr, SER12_EXTENT);
 494         printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
 495                bc_drvname, dev->base_addr, dev->irq);
 496         return 0;
 497 }
 498
 499 /* --------------------------------------------------------------------- */
 500 /*
 501  * ===================== hdlcdrv driver interface =========================
 502  */
 503
 504 /* --------------------------------------------------------------------- */
 505
 506 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 507                         struct hdlcdrv_ioctl *hi, int cmd);
 508
 509 /* --------------------------------------------------------------------- */
 510
 511 static struct hdlcdrv_ops ser12_ops = {
 512         .drvname = bc_drvname,
 513         .drvinfo = bc_drvinfo,
 514         .open    = ser12_open,
 515         .close   = ser12_close,
 516         .ioctl   = baycom_ioctl,
 517 };
 518
 519 /* --------------------------------------------------------------------- */
 520
 521 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 522 {
 523         unsigned int baud;
 524
 525         if (!strncmp(modestr, "ser", 3)) {
 526                 baud = simple_strtoul(modestr+3, NULL, 10);
 527                 if (baud >= 3 && baud <= 48)
 528                         bc->baud = baud*100;
 529         }
 530         if (strchr(modestr, '*'))
 531                 bc->opt_dcd = 0;
 532         else if (strchr(modestr, '+'))
 533                 bc->opt_dcd = -1;
 534         else
 535                 bc->opt_dcd = 1;
 536         return 0;
 537 }
 538
 539 /* --------------------------------------------------------------------- */
 540
 541 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
 542                         struct hdlcdrv_ioctl *hi, int cmd)
 543 {
 544         struct baycom_state *bc;
 545         struct baycom_ioctl bi;
 546
 547         if (!dev)
 548                 return -EINVAL;
 549
 550         bc = netdev_priv(dev);
 551         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
 552
 553         if (cmd != SIOCDEVPRIVATE)
 554                 return -ENOIOCTLCMD;
 555         switch (hi->cmd) {
 556         default:
 557                 break;
 558
 559         case HDLCDRVCTL_GETMODE:
 560                 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
 561                 if (bc->opt_dcd <= 0)
 562                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
 563                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 564                         return -EFAULT;
 565                 return 0;
 566
 567         case HDLCDRVCTL_SETMODE:
 568                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
 569                         return -EACCES;
 570                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
 571                 return baycom_setmode(bc, hi->data.modename);
 572
 573         case HDLCDRVCTL_MODELIST:
 574                 strcpy(hi->data.modename, "ser12,ser3,ser24");
 575                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
 576                         return -EFAULT;
 577                 return 0;
 578
 579         case HDLCDRVCTL_MODEMPARMASK:
 580                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
 581
 582         }
 583
 584         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
 585                 return -EFAULT;
 586         switch (bi.cmd) {
 587         default:
 588                 return -ENOIOCTLCMD;
 589
 590 #ifdef BAYCOM_DEBUG
 591         case BAYCOMCTL_GETDEBUG:
 592                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
 593                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
 594                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
 595                 break;
 596 #endif /* BAYCOM_DEBUG */
 597
 598         }
 599         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
 600                 return -EFAULT;
 601         return 0;
 602
 603 }
 604
 605 /* --------------------------------------------------------------------- */
 606
 607 /*
 608  * command line settable parameters
 609  */
 610 static char *mode[NR_PORTS] = { "ser12*", };
 611 static int iobase[NR_PORTS] = { 0x3f8, };
 612 static int irq[NR_PORTS] = { 4, };
 613 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
 614
 615 module_param_array(mode, charp, NULL, 0);
 616 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
 617 module_param_array(iobase, int, NULL, 0);
 618 MODULE_PARM_DESC(iobase, "baycom io base address");
 619 module_param_array(irq, int, NULL, 0);
 620 MODULE_PARM_DESC(irq, "baycom irq number");
 621 module_param_array(baud, int, NULL, 0);
 622 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
 623
 624 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
 625 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
 626 MODULE_LICENSE("GPL");
 627
 628 /* --------------------------------------------------------------------- */
 629
 630 static int __init init_baycomserfdx(void)
 631 {
 632         int i, found = 0;
 633         char set_hw = 1;
 634
 635         printk(bc_drvinfo);
 636         /*
 637          * register net devices
 638          */
 639         for (i = 0; i < NR_PORTS; i++) {
 640                 struct net_device *dev;
 641                 struct baycom_state *bc;
 642                 char ifname[IFNAMSIZ];
 643
 644                 sprintf(ifname, "bcsf%d", i);
 645
 646                 if (!mode[i])
 647                         set_hw = 0;
 648                 if (!set_hw)
 649                         iobase[i] = irq[i] = 0;
 650
 651                 dev = hdlcdrv_register(&ser12_ops,
 652                                        sizeof(struct baycom_state),
 653                                        ifname, iobase[i], irq[i], 0);
 654                 if (IS_ERR(dev))
 655                         break;
 656
 657                 bc = netdev_priv(dev);
 658                 if (set_hw && baycom_setmode(bc, mode[i]))
 659                         set_hw = 0;
 660                 bc->baud = baud[i];
 661                 found++;
 662                 baycom_device[i] = dev;
 663         }
 664
 665         if (!found)
 666                 return -ENXIO;
 667         return 0;
 668 }
 669
 670 static void __exit cleanup_baycomserfdx(void)
 671 {
 672         int i;
 673
 674         for(i = 0; i < NR_PORTS; i++) {
 675                 struct net_device *dev = baycom_device[i];
 676                 if (dev)
 677                         hdlcdrv_unregister(dev);
 678         }
 679 }
 680
 681 module_init(init_baycomserfdx);
 682 module_exit(cleanup_baycomserfdx);
 683
 684 /* --------------------------------------------------------------------- */
 685
 686 #ifndef MODULE
 687
 688 /*
 689  * format: baycom_ser_fdx=io,irq,mode
 690  * mode: ser#    hardware DCD
 691  *       ser#*   software DCD
 692  *       ser#+   hardware DCD, inverted signal at DCD pin
 693  * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 694  */
 695
 696 static int __init baycom_ser_fdx_setup(char *str)
 697 {
 698         static unsigned nr_dev;
 699         int ints[4];
 700
 701         if (nr_dev >= NR_PORTS)
 702                 return 0;
 703         str = get_options(str, 4, ints);
 704         if (ints[0] < 2)
 705                 return 0;
 706         mode[nr_dev] = str;
 707         iobase[nr_dev] = ints[1];
 708         irq[nr_dev] = ints[2];
 709         if (ints[0] >= 3)
 710                 baud[nr_dev] = ints[3];
 711         nr_dev++;
 712         return 1;
 713 }
 714
 715 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
 716
 717 #endif /* MODULE */
 718 /* --------------------------------------------------------------------- */