File: /usr/src/linux/drivers/net/hamradio/baycom_ser_hdx.c
1 /*****************************************************************************/
2
3 /*
4 * baycom_ser_hdx.c -- baycom ser12 halfduplex 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 *
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/version.h>
65 #include <linux/module.h>
66 #include <linux/ioport.h>
67 #include <linux/string.h>
68 #include <linux/init.h>
69 #include <asm/uaccess.h>
70 #include <asm/io.h>
71 #include <linux/hdlcdrv.h>
72 #include <linux/baycom.h>
73
74 /* --------------------------------------------------------------------- */
75
76 #define BAYCOM_DEBUG
77
78 /* --------------------------------------------------------------------- */
79
80 static const char bc_drvname[] = "baycom_ser_hdx";
81 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
82 KERN_INFO "baycom_ser_hdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
83
84 /* --------------------------------------------------------------------- */
85
86 #define NR_PORTS 4
87
88 static struct net_device baycom_device[NR_PORTS];
89
90 /* --------------------------------------------------------------------- */
91
92 #define RBR(iobase) (iobase+0)
93 #define THR(iobase) (iobase+0)
94 #define IER(iobase) (iobase+1)
95 #define IIR(iobase) (iobase+2)
96 #define FCR(iobase) (iobase+2)
97 #define LCR(iobase) (iobase+3)
98 #define MCR(iobase) (iobase+4)
99 #define LSR(iobase) (iobase+5)
100 #define MSR(iobase) (iobase+6)
101 #define SCR(iobase) (iobase+7)
102 #define DLL(iobase) (iobase+0)
103 #define DLM(iobase) (iobase+1)
104
105 #define SER12_EXTENT 8
106
107 /* ---------------------------------------------------------------------- */
108 /*
109 * Information that need to be kept for each board.
110 */
111
112 struct baycom_state {
113 struct hdlcdrv_state hdrv;
114
115 int opt_dcd;
116
117 struct modem_state {
118 short arb_divider;
119 unsigned char flags;
120 unsigned int shreg;
121 struct modem_state_ser12 {
122 unsigned char tx_bit;
123 int dcd_sum0, dcd_sum1, dcd_sum2;
124 unsigned char last_sample;
125 unsigned char last_rxbit;
126 unsigned int dcd_shreg;
127 unsigned int dcd_time;
128 unsigned int bit_pll;
129 unsigned char interm_sample;
130 } ser12;
131 } modem;
132
133 #ifdef BAYCOM_DEBUG
134 struct debug_vals {
135 unsigned long last_jiffies;
136 unsigned cur_intcnt;
137 unsigned last_intcnt;
138 int cur_pllcorr;
139 int last_pllcorr;
140 } debug_vals;
141 #endif /* BAYCOM_DEBUG */
142 };
143
144 /* --------------------------------------------------------------------- */
145
146 static void inline baycom_int_freq(struct baycom_state *bc)
147 {
148 #ifdef BAYCOM_DEBUG
149 unsigned long cur_jiffies = jiffies;
150 /*
151 * measure the interrupt frequency
152 */
153 bc->debug_vals.cur_intcnt++;
154 if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
155 bc->debug_vals.last_jiffies = cur_jiffies;
156 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
157 bc->debug_vals.cur_intcnt = 0;
158 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
159 bc->debug_vals.cur_pllcorr = 0;
160 }
161 #endif /* BAYCOM_DEBUG */
162 }
163
164 /* --------------------------------------------------------------------- */
165 /*
166 * ===================== SER12 specific routines =========================
167 */
168
169 static void inline ser12_set_divisor(struct net_device *dev,
170 unsigned char divisor)
171 {
172 outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */
173 outb(divisor, DLL(dev->base_addr));
174 outb(0, DLM(dev->base_addr));
175 outb(0x01, LCR(dev->base_addr)); /* word length = 6 */
176 /*
177 * make sure the next interrupt is generated;
178 * 0 must be used to power the modem; the modem draws its
179 * power from the TxD line
180 */
181 outb(0x00, THR(dev->base_addr));
182 /*
183 * it is important not to set the divider while transmitting;
184 * this reportedly makes some UARTs generating interrupts
185 * in the hundredthousands per second region
186 * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
187 */
188 }
189
190 /* --------------------------------------------------------------------- */
191
192 /*
193 * must call the TX arbitrator every 10ms
194 */
195 #define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36)
196
197 #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
198
199 static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
200 {
201 /* one interrupt per channel bit */
202 ser12_set_divisor(dev, 12);
203 /*
204 * first output the last bit (!) then call HDLC transmitter,
205 * since this may take quite long
206 */
207 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
208 if (bc->modem.shreg <= 1)
209 bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
210 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
211 (bc->modem.shreg & 1));
212 bc->modem.shreg >>= 1;
213 }
214
215 /* --------------------------------------------------------------------- */
216
217 static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
218 {
219 unsigned char cur_s;
220 /*
221 * do demodulator
222 */
223 cur_s = inb(MSR(dev->base_addr)) & 0x10; /* the CTS line */
224 hdlcdrv_channelbit(&bc->hdrv, cur_s);
225 bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
226 (cur_s != bc->modem.ser12.last_sample);
227 bc->modem.ser12.last_sample = cur_s;
228 if(bc->modem.ser12.dcd_shreg & 1) {
229 if (!bc->opt_dcd) {
230 unsigned int dcdspos, dcdsneg;
231
232 dcdspos = dcdsneg = 0;
233 dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
234 if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
235 dcdspos += 2;
236 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
237 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
238 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
239
240 bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
241 } else
242 bc->modem.ser12.dcd_sum0--;
243 }
244 if(!bc->modem.ser12.dcd_time) {
245 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
246 bc->modem.ser12.dcd_sum1 +
247 bc->modem.ser12.dcd_sum2) < 0);
248 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
249 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
250 /* offset to ensure DCD off on silent input */
251 bc->modem.ser12.dcd_sum0 = 2;
252 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
253 }
254 bc->modem.ser12.dcd_time--;
255 if (!bc->opt_dcd) {
256 /*
257 * PLL code for the improved software DCD algorithm
258 */
259 if (bc->modem.ser12.interm_sample) {
260 /*
261 * intermediate sample; set timing correction to normal
262 */
263 ser12_set_divisor(dev, 4);
264 } else {
265 /*
266 * do PLL correction and call HDLC receiver
267 */
268 switch (bc->modem.ser12.dcd_shreg & 7) {
269 case 1: /* transition too late */
270 ser12_set_divisor(dev, 5);
271 #ifdef BAYCOM_DEBUG
272 bc->debug_vals.cur_pllcorr++;
273 #endif /* BAYCOM_DEBUG */
274 break;
275 case 4: /* transition too early */
276 ser12_set_divisor(dev, 3);
277 #ifdef BAYCOM_DEBUG
278 bc->debug_vals.cur_pllcorr--;
279 #endif /* BAYCOM_DEBUG */
280 break;
281 default:
282 ser12_set_divisor(dev, 4);
283 break;
284 }
285 bc->modem.shreg >>= 1;
286 if (bc->modem.ser12.last_sample ==
287 bc->modem.ser12.last_rxbit)
288 bc->modem.shreg |= 0x10000;
289 bc->modem.ser12.last_rxbit =
290 bc->modem.ser12.last_sample;
291 }
292 if (++bc->modem.ser12.interm_sample >= 3)
293 bc->modem.ser12.interm_sample = 0;
294 /*
295 * DCD stuff
296 */
297 if (bc->modem.ser12.dcd_shreg & 1) {
298 unsigned int dcdspos, dcdsneg;
299
300 dcdspos = dcdsneg = 0;
301 dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
302 dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
303 << 1;
304 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
305 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
306 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
307
308 bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
309 }
310 } else {
311 /*
312 * PLL algorithm for the hardware squelch DCD algorithm
313 */
314 if (bc->modem.ser12.interm_sample) {
315 /*
316 * intermediate sample; set timing correction to normal
317 */
318 ser12_set_divisor(dev, 6);
319 } else {
320 /*
321 * do PLL correction and call HDLC receiver
322 */
323 switch (bc->modem.ser12.dcd_shreg & 3) {
324 case 1: /* transition too late */
325 ser12_set_divisor(dev, 7);
326 #ifdef BAYCOM_DEBUG
327 bc->debug_vals.cur_pllcorr++;
328 #endif /* BAYCOM_DEBUG */
329 break;
330 case 2: /* transition too early */
331 ser12_set_divisor(dev, 5);
332 #ifdef BAYCOM_DEBUG
333 bc->debug_vals.cur_pllcorr--;
334 #endif /* BAYCOM_DEBUG */
335 break;
336 default:
337 ser12_set_divisor(dev, 6);
338 break;
339 }
340 bc->modem.shreg >>= 1;
341 if (bc->modem.ser12.last_sample ==
342 bc->modem.ser12.last_rxbit)
343 bc->modem.shreg |= 0x10000;
344 bc->modem.ser12.last_rxbit =
345 bc->modem.ser12.last_sample;
346 }
347 bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
348 /*
349 * DCD stuff
350 */
351 bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
352 }
353 outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
354 if (bc->modem.shreg & 1) {
355 hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
356 bc->modem.shreg = 0x10000;
357 }
358 if(!bc->modem.ser12.dcd_time) {
359 if (bc->opt_dcd & 1)
360 hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
361 else
362 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
363 bc->modem.ser12.dcd_sum1 +
364 bc->modem.ser12.dcd_sum2) < 0);
365 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
366 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
367 /* offset to ensure DCD off on silent input */
368 bc->modem.ser12.dcd_sum0 = 2;
369 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
370 }
371 bc->modem.ser12.dcd_time--;
372 }
373
374 /* --------------------------------------------------------------------- */
375
376 static void ser12_interrupt(int irq, void *dev_id, struct pt_regs *regs)
377 {
378 struct net_device *dev = (struct net_device *)dev_id;
379 struct baycom_state *bc = (struct baycom_state *)dev->priv;
380 unsigned char iir;
381
382 if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
383 return;
384 /* fast way out */
385 if ((iir = inb(IIR(dev->base_addr))) & 1)
386 return;
387 baycom_int_freq(bc);
388 do {
389 switch (iir & 6) {
390 case 6:
391 inb(LSR(dev->base_addr));
392 break;
393
394 case 4:
395 inb(RBR(dev->base_addr));
396 break;
397
398 case 2:
399 /*
400 * check if transmitter active
401 */
402 if (hdlcdrv_ptt(&bc->hdrv))
403 ser12_tx(dev, bc);
404 else {
405 ser12_rx(dev, bc);
406 bc->modem.arb_divider--;
407 }
408 outb(0x00, THR(dev->base_addr));
409 break;
410
411 default:
412 inb(MSR(dev->base_addr));
413 break;
414 }
415 iir = inb(IIR(dev->base_addr));
416 } while (!(iir & 1));
417 if (bc->modem.arb_divider <= 0) {
418 bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
419 __sti();
420 hdlcdrv_arbitrate(dev, &bc->hdrv);
421 }
422 __sti();
423 hdlcdrv_transmitter(dev, &bc->hdrv);
424 hdlcdrv_receiver(dev, &bc->hdrv);
425 __cli();
426 }
427
428 /* --------------------------------------------------------------------- */
429
430 enum uart { c_uart_unknown, c_uart_8250,
431 c_uart_16450, c_uart_16550, c_uart_16550A};
432 static const char *uart_str[] = {
433 "unknown", "8250", "16450", "16550", "16550A"
434 };
435
436 static enum uart ser12_check_uart(unsigned int iobase)
437 {
438 unsigned char b1,b2,b3;
439 enum uart u;
440 enum uart uart_tab[] =
441 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
442
443 b1 = inb(MCR(iobase));
444 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
445 b2 = inb(MSR(iobase));
446 outb(0x1a, MCR(iobase));
447 b3 = inb(MSR(iobase)) & 0xf0;
448 outb(b1, MCR(iobase)); /* restore old values */
449 outb(b2, MSR(iobase));
450 if (b3 != 0x90)
451 return c_uart_unknown;
452 inb(RBR(iobase));
453 inb(RBR(iobase));
454 outb(0x01, FCR(iobase)); /* enable FIFOs */
455 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
456 if (u == c_uart_16450) {
457 outb(0x5a, SCR(iobase));
458 b1 = inb(SCR(iobase));
459 outb(0xa5, SCR(iobase));
460 b2 = inb(SCR(iobase));
461 if ((b1 != 0x5a) || (b2 != 0xa5))
462 u = c_uart_8250;
463 }
464 return u;
465 }
466
467 /* --------------------------------------------------------------------- */
468
469 static int ser12_open(struct net_device *dev)
470 {
471 struct baycom_state *bc = (struct baycom_state *)dev->priv;
472 enum uart u;
473
474 if (!dev || !bc)
475 return -ENXIO;
476 if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
477 dev->irq < 2 || dev->irq > 15)
478 return -ENXIO;
479 if (check_region(dev->base_addr, SER12_EXTENT))
480 return -EACCES;
481 memset(&bc->modem, 0, sizeof(bc->modem));
482 bc->hdrv.par.bitrate = 1200;
483 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown)
484 return -EIO;
485 outb(0, FCR(dev->base_addr)); /* disable FIFOs */
486 outb(0x0d, MCR(dev->base_addr));
487 outb(0, IER(dev->base_addr));
488 if (request_irq(dev->irq, ser12_interrupt, SA_INTERRUPT | SA_SHIRQ,
489 "baycom_ser12", dev))
490 return -EBUSY;
491 request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12");
492 /*
493 * enable transmitter empty interrupt
494 */
495 outb(2, IER(dev->base_addr));
496 /*
497 * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
498 * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
499 * depending on the usage of the software DCD routine
500 */
501 ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
502 printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n",
503 bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
504 MOD_INC_USE_COUNT;
505 return 0;
506 }
507
508 /* --------------------------------------------------------------------- */
509
510 static int ser12_close(struct net_device *dev)
511 {
512 struct baycom_state *bc = (struct baycom_state *)dev->priv;
513
514 if (!dev || !bc)
515 return -EINVAL;
516 /*
517 * disable interrupts
518 */
519 outb(0, IER(dev->base_addr));
520 outb(1, MCR(dev->base_addr));
521 free_irq(dev->irq, dev);
522 release_region(dev->base_addr, SER12_EXTENT);
523 printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
524 bc_drvname, dev->base_addr, dev->irq);
525 MOD_DEC_USE_COUNT;
526 return 0;
527 }
528
529 /* --------------------------------------------------------------------- */
530 /*
531 * ===================== hdlcdrv driver interface =========================
532 */
533
534 /* --------------------------------------------------------------------- */
535
536 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
537 struct hdlcdrv_ioctl *hi, int cmd);
538
539 /* --------------------------------------------------------------------- */
540
541 static struct hdlcdrv_ops ser12_ops = {
542 bc_drvname,
543 bc_drvinfo,
544 ser12_open,
545 ser12_close,
546 baycom_ioctl
547 };
548
549 /* --------------------------------------------------------------------- */
550
551 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
552 {
553 if (strchr(modestr, '*'))
554 bc->opt_dcd = 0;
555 else if (strchr(modestr, '+'))
556 bc->opt_dcd = -1;
557 else if (strchr(modestr, '@'))
558 bc->opt_dcd = -2;
559 else
560 bc->opt_dcd = 1;
561 return 0;
562 }
563
564 /* --------------------------------------------------------------------- */
565
566 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
567 struct hdlcdrv_ioctl *hi, int cmd)
568 {
569 struct baycom_state *bc;
570 struct baycom_ioctl bi;
571 int cmd2;
572
573 if (!dev || !dev->priv ||
574 ((struct baycom_state *)dev->priv)->hdrv.magic != HDLCDRV_MAGIC) {
575 printk(KERN_ERR "bc_ioctl: invalid device struct\n");
576 return -EINVAL;
577 }
578 bc = (struct baycom_state *)dev->priv;
579
580 if (cmd != SIOCDEVPRIVATE)
581 return -ENOIOCTLCMD;
582 if (get_user(cmd2, (int *)ifr->ifr_data))
583 return -EFAULT;
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_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
644 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
645 MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
646 MODULE_PARM_DESC(iobase, "baycom io base address");
647 MODULE_PARM(irq, "1-" __MODULE_STRING(NR_PORTS) "i");
648 MODULE_PARM_DESC(irq, "baycom irq number");
649
650 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
651 MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
652
653 /* --------------------------------------------------------------------- */
654
655 static int __init init_baycomserhdx(void)
656 {
657 int i, j, found = 0;
658 char set_hw = 1;
659 struct baycom_state *bc;
660
661 printk(bc_drvinfo);
662 /*
663 * register net devices
664 */
665 for (i = 0; i < NR_PORTS; i++) {
666 struct net_device *dev = baycom_device+i;
667 char ifname[IFNAMSIZ];
668
669 sprintf(ifname, "bcsh%d", i);
670 if (!mode[i])
671 set_hw = 0;
672 if (!set_hw)
673 iobase[i] = irq[i] = 0;
674 j = hdlcdrv_register_hdlcdrv(dev, &ser12_ops, sizeof(struct baycom_state),
675 ifname, iobase[i], irq[i], 0);
676 if (!j) {
677 bc = (struct baycom_state *)dev->priv;
678 if (set_hw && baycom_setmode(bc, mode[i]))
679 set_hw = 0;
680 found++;
681 } else {
682 printk(KERN_WARNING "%s: cannot register net device\n",
683 bc_drvname);
684 }
685 }
686 if (!found)
687 return -ENXIO;
688 return 0;
689 }
690
691 static void __exit cleanup_baycomserhdx(void)
692 {
693 int i;
694
695 for(i = 0; i < NR_PORTS; i++) {
696 struct net_device *dev = baycom_device+i;
697 struct baycom_state *bc = (struct baycom_state *)dev->priv;
698
699 if (bc) {
700 if (bc->hdrv.magic != HDLCDRV_MAGIC)
701 printk(KERN_ERR "baycom: invalid magic in "
702 "cleanup_module\n");
703 else
704 hdlcdrv_unregister_hdlcdrv(dev);
705 }
706 }
707 }
708
709 module_init(init_baycomserhdx);
710 module_exit(cleanup_baycomserhdx);
711
712 /* --------------------------------------------------------------------- */
713
714 #ifndef MODULE
715
716 /*
717 * format: baycom_ser_hdx=io,irq,mode
718 * mode: ser12 hardware DCD
719 * ser12* software DCD
720 * ser12@ hardware/software DCD, i.e. no explicit DCD signal but hardware
721 * mutes audio input to the modem
722 * ser12+ hardware DCD, inverted signal at DCD pin
723 */
724
725 static int __init baycom_ser_hdx_setup(char *str)
726 {
727 static unsigned nr_dev;
728 int ints[3];
729
730 if (nr_dev >= NR_PORTS)
731 return 0;
732 str = get_options(str, 3, ints);
733 if (ints[0] < 2)
734 return 0;
735 mode[nr_dev] = str;
736 iobase[nr_dev] = ints[1];
737 irq[nr_dev] = ints[2];
738 nr_dev++;
739 return 1;
740 }
741
742 __setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
743
744 #endif /* MODULE */
745 /* --------------------------------------------------------------------- */
746