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baycom_ser_fdx.c
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1 /*****************************************************************************/
2 
3 /*
4  * baycom_ser_fdx.c -- baycom ser12 fullduplex radio modem driver.
5  *
6  * Copyright (C) 1996-2000 Thomas Sailer ([email protected])
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: [email protected] (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, [email protected], [email protected]");
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 /* --------------------------------------------------------------------- */
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