Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
baycom_ser_hdx.c
Go to the documentation of this file.
1 /*****************************************************************************/
2 
3 /*
4  * baycom_ser_hdx.c -- baycom ser12 halfduplex 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  *
38  * Command line options (insmod command line)
39  *
40  * mode ser12 hardware DCD
41  * ser12* software DCD
42  * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware
43  * mutes audio input to the modem
44  * ser12+ hardware DCD, inverted signal at DCD pin
45  * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
46  * irq interrupt line of the port; common values are 4,3
47  *
48  *
49  * History:
50  * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface
51  * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user)
52  * 0.3 26.04.1997 init code/data tagged
53  * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints)
54  * 0.5 11.11.1997 ser12/par96 split into separate files
55  * 0.6 14.04.1998 cleanups
56  * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall
57  * 0.8 10.08.1999 use module_init/module_exit
58  * 0.9 12.02.2000 adapted to softnet driver interface
59  * 0.10 03.07.2000 fix interface name handling
60  */
61 
62 /*****************************************************************************/
63 
64 #include <linux/capability.h>
65 #include <linux/module.h>
66 #include <linux/ioport.h>
67 #include <linux/string.h>
68 #include <linux/init.h>
69 #include <linux/interrupt.h>
70 #include <asm/uaccess.h>
71 #include <asm/io.h>
72 #include <linux/hdlcdrv.h>
73 #include <linux/baycom.h>
74 #include <linux/jiffies.h>
75 
76 /* --------------------------------------------------------------------- */
77 
78 #define BAYCOM_DEBUG
79 
80 /* --------------------------------------------------------------------- */
81 
82 static const char bc_drvname[] = "baycom_ser_hdx";
83 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
84 "baycom_ser_hdx: version 0.10\n";
85 
86 /* --------------------------------------------------------------------- */
87 
88 #define NR_PORTS 4
89 
90 static struct net_device *baycom_device[NR_PORTS];
91 
92 /* --------------------------------------------------------------------- */
93 
94 #define RBR(iobase) (iobase+0)
95 #define THR(iobase) (iobase+0)
96 #define IER(iobase) (iobase+1)
97 #define IIR(iobase) (iobase+2)
98 #define FCR(iobase) (iobase+2)
99 #define LCR(iobase) (iobase+3)
100 #define MCR(iobase) (iobase+4)
101 #define LSR(iobase) (iobase+5)
102 #define MSR(iobase) (iobase+6)
103 #define SCR(iobase) (iobase+7)
104 #define DLL(iobase) (iobase+0)
105 #define DLM(iobase) (iobase+1)
106 
107 #define SER12_EXTENT 8
108 
109 /* ---------------------------------------------------------------------- */
110 /*
111  * Information that need to be kept for each board.
112  */
113 
114 struct baycom_state {
115  struct hdlcdrv_state hdrv;
116 
117  int opt_dcd;
118 
119  struct modem_state {
120  short arb_divider;
121  unsigned char flags;
122  unsigned int shreg;
123  struct modem_state_ser12 {
124  unsigned char tx_bit;
125  int dcd_sum0, dcd_sum1, dcd_sum2;
126  unsigned char last_sample;
127  unsigned char last_rxbit;
128  unsigned int dcd_shreg;
129  unsigned int dcd_time;
130  unsigned int bit_pll;
131  unsigned char interm_sample;
132  } ser12;
133  } modem;
134 
135 #ifdef BAYCOM_DEBUG
136  struct debug_vals {
137  unsigned long last_jiffies;
138  unsigned cur_intcnt;
139  unsigned last_intcnt;
140  int cur_pllcorr;
141  int last_pllcorr;
142  } debug_vals;
143 #endif /* BAYCOM_DEBUG */
144 };
145 
146 /* --------------------------------------------------------------------- */
147 
148 static inline void baycom_int_freq(struct baycom_state *bc)
149 {
150 #ifdef BAYCOM_DEBUG
151  unsigned long cur_jiffies = jiffies;
152  /*
153  * measure the interrupt frequency
154  */
155  bc->debug_vals.cur_intcnt++;
156  if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
157  bc->debug_vals.last_jiffies = cur_jiffies;
158  bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
159  bc->debug_vals.cur_intcnt = 0;
160  bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
161  bc->debug_vals.cur_pllcorr = 0;
162  }
163 #endif /* BAYCOM_DEBUG */
164 }
165 
166 /* --------------------------------------------------------------------- */
167 /*
168  * ===================== SER12 specific routines =========================
169  */
170 
171 static inline void ser12_set_divisor(struct net_device *dev,
172  unsigned char divisor)
173 {
174  outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */
175  outb(divisor, DLL(dev->base_addr));
176  outb(0, DLM(dev->base_addr));
177  outb(0x01, LCR(dev->base_addr)); /* word length = 6 */
178  /*
179  * make sure the next interrupt is generated;
180  * 0 must be used to power the modem; the modem draws its
181  * power from the TxD line
182  */
183  outb(0x00, THR(dev->base_addr));
184  /*
185  * it is important not to set the divider while transmitting;
186  * this reportedly makes some UARTs generating interrupts
187  * in the hundredthousands per second region
188  * Reported by: [email protected] (Ignacio Arenaza Nuno)
189  */
190 }
191 
192 /* --------------------------------------------------------------------- */
193 
194 /*
195  * must call the TX arbitrator every 10ms
196  */
197 #define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36)
198 
199 #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
200 
201 static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
202 {
203  /* one interrupt per channel bit */
204  ser12_set_divisor(dev, 12);
205  /*
206  * first output the last bit (!) then call HDLC transmitter,
207  * since this may take quite long
208  */
209  outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
210  if (bc->modem.shreg <= 1)
211  bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
212  bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
213  (bc->modem.shreg & 1));
214  bc->modem.shreg >>= 1;
215 }
216 
217 /* --------------------------------------------------------------------- */
218 
219 static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
220 {
221  unsigned char cur_s;
222  /*
223  * do demodulator
224  */
225  cur_s = inb(MSR(dev->base_addr)) & 0x10; /* the CTS line */
226  hdlcdrv_channelbit(&bc->hdrv, cur_s);
227  bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
228  (cur_s != bc->modem.ser12.last_sample);
229  bc->modem.ser12.last_sample = cur_s;
230  if(bc->modem.ser12.dcd_shreg & 1) {
231  if (!bc->opt_dcd) {
232  unsigned int dcdspos, dcdsneg;
233 
234  dcdspos = dcdsneg = 0;
235  dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
236  if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
237  dcdspos += 2;
238  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
239  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
240  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
241 
242  bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
243  } else
244  bc->modem.ser12.dcd_sum0--;
245  }
246  if(!bc->modem.ser12.dcd_time) {
247  hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
248  bc->modem.ser12.dcd_sum1 +
249  bc->modem.ser12.dcd_sum2) < 0);
250  bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
251  bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
252  /* offset to ensure DCD off on silent input */
253  bc->modem.ser12.dcd_sum0 = 2;
254  bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
255  }
256  bc->modem.ser12.dcd_time--;
257  if (!bc->opt_dcd) {
258  /*
259  * PLL code for the improved software DCD algorithm
260  */
261  if (bc->modem.ser12.interm_sample) {
262  /*
263  * intermediate sample; set timing correction to normal
264  */
265  ser12_set_divisor(dev, 4);
266  } else {
267  /*
268  * do PLL correction and call HDLC receiver
269  */
270  switch (bc->modem.ser12.dcd_shreg & 7) {
271  case 1: /* transition too late */
272  ser12_set_divisor(dev, 5);
273 #ifdef BAYCOM_DEBUG
274  bc->debug_vals.cur_pllcorr++;
275 #endif /* BAYCOM_DEBUG */
276  break;
277  case 4: /* transition too early */
278  ser12_set_divisor(dev, 3);
279 #ifdef BAYCOM_DEBUG
280  bc->debug_vals.cur_pllcorr--;
281 #endif /* BAYCOM_DEBUG */
282  break;
283  default:
284  ser12_set_divisor(dev, 4);
285  break;
286  }
287  bc->modem.shreg >>= 1;
288  if (bc->modem.ser12.last_sample ==
289  bc->modem.ser12.last_rxbit)
290  bc->modem.shreg |= 0x10000;
291  bc->modem.ser12.last_rxbit =
292  bc->modem.ser12.last_sample;
293  }
294  if (++bc->modem.ser12.interm_sample >= 3)
295  bc->modem.ser12.interm_sample = 0;
296  /*
297  * DCD stuff
298  */
299  if (bc->modem.ser12.dcd_shreg & 1) {
300  unsigned int dcdspos, dcdsneg;
301 
302  dcdspos = dcdsneg = 0;
303  dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
304  dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
305  << 1;
306  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
307  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
308  dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
309 
310  bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
311  }
312  } else {
313  /*
314  * PLL algorithm for the hardware squelch DCD algorithm
315  */
316  if (bc->modem.ser12.interm_sample) {
317  /*
318  * intermediate sample; set timing correction to normal
319  */
320  ser12_set_divisor(dev, 6);
321  } else {
322  /*
323  * do PLL correction and call HDLC receiver
324  */
325  switch (bc->modem.ser12.dcd_shreg & 3) {
326  case 1: /* transition too late */
327  ser12_set_divisor(dev, 7);
328 #ifdef BAYCOM_DEBUG
329  bc->debug_vals.cur_pllcorr++;
330 #endif /* BAYCOM_DEBUG */
331  break;
332  case 2: /* transition too early */
333  ser12_set_divisor(dev, 5);
334 #ifdef BAYCOM_DEBUG
335  bc->debug_vals.cur_pllcorr--;
336 #endif /* BAYCOM_DEBUG */
337  break;
338  default:
339  ser12_set_divisor(dev, 6);
340  break;
341  }
342  bc->modem.shreg >>= 1;
343  if (bc->modem.ser12.last_sample ==
344  bc->modem.ser12.last_rxbit)
345  bc->modem.shreg |= 0x10000;
346  bc->modem.ser12.last_rxbit =
347  bc->modem.ser12.last_sample;
348  }
349  bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
350  /*
351  * DCD stuff
352  */
353  bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
354  }
355  outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
356  if (bc->modem.shreg & 1) {
357  hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
358  bc->modem.shreg = 0x10000;
359  }
360  if(!bc->modem.ser12.dcd_time) {
361  if (bc->opt_dcd & 1)
362  hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
363  else
364  hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
365  bc->modem.ser12.dcd_sum1 +
366  bc->modem.ser12.dcd_sum2) < 0);
367  bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
368  bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
369  /* offset to ensure DCD off on silent input */
370  bc->modem.ser12.dcd_sum0 = 2;
371  bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
372  }
373  bc->modem.ser12.dcd_time--;
374 }
375 
376 /* --------------------------------------------------------------------- */
377 
378 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
379 {
380  struct net_device *dev = (struct net_device *)dev_id;
381  struct baycom_state *bc = netdev_priv(dev);
382  unsigned char iir;
383 
384  if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
385  return IRQ_NONE;
386  /* fast way out */
387  if ((iir = inb(IIR(dev->base_addr))) & 1)
388  return IRQ_NONE;
389  baycom_int_freq(bc);
390  do {
391  switch (iir & 6) {
392  case 6:
393  inb(LSR(dev->base_addr));
394  break;
395 
396  case 4:
397  inb(RBR(dev->base_addr));
398  break;
399 
400  case 2:
401  /*
402  * check if transmitter active
403  */
404  if (hdlcdrv_ptt(&bc->hdrv))
405  ser12_tx(dev, bc);
406  else {
407  ser12_rx(dev, bc);
408  bc->modem.arb_divider--;
409  }
410  outb(0x00, THR(dev->base_addr));
411  break;
412 
413  default:
414  inb(MSR(dev->base_addr));
415  break;
416  }
417  iir = inb(IIR(dev->base_addr));
418  } while (!(iir & 1));
419  if (bc->modem.arb_divider <= 0) {
420  bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
421  local_irq_enable();
422  hdlcdrv_arbitrate(dev, &bc->hdrv);
423  }
424  local_irq_enable();
425  hdlcdrv_transmitter(dev, &bc->hdrv);
426  hdlcdrv_receiver(dev, &bc->hdrv);
427  local_irq_disable();
428  return IRQ_HANDLED;
429 }
430 
431 /* --------------------------------------------------------------------- */
432 
433 enum uart { c_uart_unknown, c_uart_8250,
434  c_uart_16450, c_uart_16550, c_uart_16550A};
435 static const char *uart_str[] = {
436  "unknown", "8250", "16450", "16550", "16550A"
437 };
438 
439 static enum uart ser12_check_uart(unsigned int iobase)
440 {
441  unsigned char b1,b2,b3;
442  enum uart u;
443  enum uart uart_tab[] =
444  { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
445 
446  b1 = inb(MCR(iobase));
447  outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
448  b2 = inb(MSR(iobase));
449  outb(0x1a, MCR(iobase));
450  b3 = inb(MSR(iobase)) & 0xf0;
451  outb(b1, MCR(iobase)); /* restore old values */
452  outb(b2, MSR(iobase));
453  if (b3 != 0x90)
454  return c_uart_unknown;
455  inb(RBR(iobase));
456  inb(RBR(iobase));
457  outb(0x01, FCR(iobase)); /* enable FIFOs */
458  u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
459  if (u == c_uart_16450) {
460  outb(0x5a, SCR(iobase));
461  b1 = inb(SCR(iobase));
462  outb(0xa5, SCR(iobase));
463  b2 = inb(SCR(iobase));
464  if ((b1 != 0x5a) || (b2 != 0xa5))
465  u = c_uart_8250;
466  }
467  return u;
468 }
469 
470 /* --------------------------------------------------------------------- */
471 
472 static int ser12_open(struct net_device *dev)
473 {
474  struct baycom_state *bc = netdev_priv(dev);
475  enum uart u;
476 
477  if (!dev || !bc)
478  return -ENXIO;
479  if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
480  dev->irq < 2 || dev->irq > 15)
481  return -ENXIO;
482  if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12"))
483  return -EACCES;
484  memset(&bc->modem, 0, sizeof(bc->modem));
485  bc->hdrv.par.bitrate = 1200;
486  if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) {
487  release_region(dev->base_addr, SER12_EXTENT);
488  return -EIO;
489  }
490  outb(0, FCR(dev->base_addr)); /* disable FIFOs */
491  outb(0x0d, MCR(dev->base_addr));
492  outb(0, IER(dev->base_addr));
493  if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
494  "baycom_ser12", dev)) {
495  release_region(dev->base_addr, SER12_EXTENT);
496  return -EBUSY;
497  }
498  /*
499  * enable transmitter empty interrupt
500  */
501  outb(2, IER(dev->base_addr));
502  /*
503  * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
504  * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
505  * depending on the usage of the software DCD routine
506  */
507  ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
508  printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n",
509  bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
510  return 0;
511 }
512 
513 /* --------------------------------------------------------------------- */
514 
515 static int ser12_close(struct net_device *dev)
516 {
517  struct baycom_state *bc = netdev_priv(dev);
518 
519  if (!dev || !bc)
520  return -EINVAL;
521  /*
522  * disable interrupts
523  */
524  outb(0, IER(dev->base_addr));
525  outb(1, MCR(dev->base_addr));
526  free_irq(dev->irq, dev);
527  release_region(dev->base_addr, SER12_EXTENT);
528  printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
529  bc_drvname, dev->base_addr, dev->irq);
530  return 0;
531 }
532 
533 /* --------------------------------------------------------------------- */
534 /*
535  * ===================== hdlcdrv driver interface =========================
536  */
537 
538 /* --------------------------------------------------------------------- */
539 
540 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
541  struct hdlcdrv_ioctl *hi, int cmd);
542 
543 /* --------------------------------------------------------------------- */
544 
545 static struct hdlcdrv_ops ser12_ops = {
546  .drvname = bc_drvname,
547  .drvinfo = bc_drvinfo,
548  .open = ser12_open,
549  .close = ser12_close,
550  .ioctl = baycom_ioctl,
551 };
552 
553 /* --------------------------------------------------------------------- */
554 
555 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
556 {
557  if (strchr(modestr, '*'))
558  bc->opt_dcd = 0;
559  else if (strchr(modestr, '+'))
560  bc->opt_dcd = -1;
561  else if (strchr(modestr, '@'))
562  bc->opt_dcd = -2;
563  else
564  bc->opt_dcd = 1;
565  return 0;
566 }
567 
568 /* --------------------------------------------------------------------- */
569 
570 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
571  struct hdlcdrv_ioctl *hi, int cmd)
572 {
573  struct baycom_state *bc;
574  struct baycom_ioctl bi;
575 
576  if (!dev)
577  return -EINVAL;
578 
579  bc = netdev_priv(dev);
580  BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
581 
582  if (cmd != SIOCDEVPRIVATE)
583  return -ENOIOCTLCMD;
584  switch (hi->cmd) {
585  default:
586  break;
587 
588  case HDLCDRVCTL_GETMODE:
589  strcpy(hi->data.modename, "ser12");
590  if (bc->opt_dcd <= 0)
591  strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
592  if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
593  return -EFAULT;
594  return 0;
595 
596  case HDLCDRVCTL_SETMODE:
597  if (netif_running(dev) || !capable(CAP_NET_ADMIN))
598  return -EACCES;
599  hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
600  return baycom_setmode(bc, hi->data.modename);
601 
602  case HDLCDRVCTL_MODELIST:
603  strcpy(hi->data.modename, "ser12");
604  if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
605  return -EFAULT;
606  return 0;
607 
608  case HDLCDRVCTL_MODEMPARMASK:
609  return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
610 
611  }
612 
613  if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
614  return -EFAULT;
615  switch (bi.cmd) {
616  default:
617  return -ENOIOCTLCMD;
618 
619 #ifdef BAYCOM_DEBUG
620  case BAYCOMCTL_GETDEBUG:
621  bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
622  bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
623  bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
624  break;
625 #endif /* BAYCOM_DEBUG */
626 
627  }
628  if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
629  return -EFAULT;
630  return 0;
631 
632 }
633 
634 /* --------------------------------------------------------------------- */
635 
636 /*
637  * command line settable parameters
638  */
639 static char *mode[NR_PORTS] = { "ser12*", };
640 static int iobase[NR_PORTS] = { 0x3f8, };
641 static int irq[NR_PORTS] = { 4, };
642 
643 module_param_array(mode, charp, NULL, 0);
644 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
645 module_param_array(iobase, int, NULL, 0);
646 MODULE_PARM_DESC(iobase, "baycom io base address");
647 module_param_array(irq, int, NULL, 0);
648 MODULE_PARM_DESC(irq, "baycom irq number");
649 
650 MODULE_AUTHOR("Thomas M. Sailer, [email protected], [email protected]");
651 MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
652 MODULE_LICENSE("GPL");
653 
654 /* --------------------------------------------------------------------- */
655 
656 static int __init init_baycomserhdx(void)
657 {
658  int i, found = 0;
659  char set_hw = 1;
660 
661  printk(bc_drvinfo);
662  /*
663  * register net devices
664  */
665  for (i = 0; i < NR_PORTS; i++) {
666  struct net_device *dev;
667  struct baycom_state *bc;
668  char ifname[IFNAMSIZ];
669 
670  sprintf(ifname, "bcsh%d", i);
671 
672  if (!mode[i])
673  set_hw = 0;
674  if (!set_hw)
675  iobase[i] = irq[i] = 0;
676 
677  dev = hdlcdrv_register(&ser12_ops,
678  sizeof(struct baycom_state),
679  ifname, iobase[i], irq[i], 0);
680  if (IS_ERR(dev))
681  break;
682 
683  bc = netdev_priv(dev);
684  if (set_hw && baycom_setmode(bc, mode[i]))
685  set_hw = 0;
686  found++;
687  baycom_device[i] = dev;
688  }
689 
690  if (!found)
691  return -ENXIO;
692  return 0;
693 }
694 
695 static void __exit cleanup_baycomserhdx(void)
696 {
697  int i;
698 
699  for(i = 0; i < NR_PORTS; i++) {
700  struct net_device *dev = baycom_device[i];
701 
702  if (dev)
703  hdlcdrv_unregister(dev);
704  }
705 }
706 
707 module_init(init_baycomserhdx);
708 module_exit(cleanup_baycomserhdx);
709 
710 /* --------------------------------------------------------------------- */
711 
712 #ifndef MODULE
713 
714 /*
715  * format: baycom_ser_hdx=io,irq,mode
716  * mode: ser12 hardware DCD
717  * ser12* software DCD
718  * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware
719  * mutes audio input to the modem
720  * ser12+ hardware DCD, inverted signal at DCD pin
721  */
722 
723 static int __init baycom_ser_hdx_setup(char *str)
724 {
725  static unsigned nr_dev;
726  int ints[3];
727 
728  if (nr_dev >= NR_PORTS)
729  return 0;
730  str = get_options(str, 3, ints);
731  if (ints[0] < 2)
732  return 0;
733  mode[nr_dev] = str;
734  iobase[nr_dev] = ints[1];
735  irq[nr_dev] = ints[2];
736  nr_dev++;
737  return 1;
738 }
739 
740 __setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
741 
742 #endif /* MODULE */
743 /* --------------------------------------------------------------------- */
Generated on Thu Jan 10 2013 14:06:28 for Linux Kernel by   doxygen 1.8.2