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 <asm/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 /* --------------------------------------------------------------------- */
719