summaryrefslogtreecommitdiffstats
path: root/drivers/net/hamradio/baycom_ser_fdx.c
blob: ebc06822fd4d658f9259752a1d370cd3417b60a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
/*****************************************************************************/

/*
 *	baycom_ser_fdx.c  -- baycom ser12 fullduplex radio modem driver.
 *
 *	Copyright (C) 1996-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Please note that the GPL allows you to use the driver, NOT the radio.
 *  In order to use the radio, you need a license from the communications
 *  authority of your country.
 *
 *
 *  Supported modems
 *
 *  ser12:  This is a very simple 1200 baud AFSK modem. The modem consists only
 *          of a modulator/demodulator chip, usually a TI TCM3105. The computer
 *          is responsible for regenerating the receiver bit clock, as well as
 *          for handling the HDLC protocol. The modem connects to a serial port,
 *          hence the name. Since the serial port is not used as an async serial
 *          port, the kernel driver for serial ports cannot be used, and this
 *          driver only supports standard serial hardware (8250, 16450, 16550A)
 *
 *          This modem usually draws its supply current out of the otherwise unused
 *          TXD pin of the serial port. Thus a contiguous stream of 0x00-bytes
 *          is transmitted to achieve a positive supply voltage.
 *
 *  hsk:    This is a 4800 baud FSK modem, designed for TNC use. It works fine
 *          in 'baycom-mode' :-)  In contrast to the TCM3105 modem, power is
 *          externally supplied. So there's no need to provide the 0x00-byte-stream
 *          when receiving or idle, which drastically reduces interrupt load.
 *
 *  Command line options (insmod command line)
 *
 *  mode     ser#    hardware DCD
 *           ser#*   software DCD
 *           ser#+   hardware DCD, inverted signal at DCD pin
 *           '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 *  iobase   base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
 *  baud     baud rate (between 300 and 4800)
 *  irq      interrupt line of the port; common values are 4,3
 *
 *
 *  History:
 *   0.1  26.06.1996  Adapted from baycom.c and made network driver interface
 *        18.10.1996  Changed to new user space access routines (copy_{to,from}_user)
 *   0.3  26.04.1997  init code/data tagged
 *   0.4  08.07.1997  alternative ser12 decoding algorithm (uses delta CTS ints)
 *   0.5  11.11.1997  ser12/par96 split into separate files
 *   0.6  24.01.1998  Thorsten Kranzkowski, dl8bcu and Thomas Sailer:
 *                    reduced interrupt load in transmit case
 *                    reworked receiver
 *   0.7  03.08.1999  adapt to Linus' new __setup/__initcall
 *   0.8  10.08.1999  use module_init/module_exit
 *   0.9  12.02.2000  adapted to softnet driver interface
 *   0.10 03.07.2000  fix interface name handling
 */

/*****************************************************************************/

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/hdlcdrv.h>
#include <linux/baycom.h>
#include <linux/jiffies.h>
#include <linux/time64.h>

#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>

/* --------------------------------------------------------------------- */

#define BAYCOM_DEBUG

/* --------------------------------------------------------------------- */

static const char bc_drvname[] = "baycom_ser_fdx";
static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
"baycom_ser_fdx: version 0.10\n";

/* --------------------------------------------------------------------- */

#define NR_PORTS 4

static struct net_device *baycom_device[NR_PORTS];

/* --------------------------------------------------------------------- */

#define RBR(iobase) (iobase+0)
#define THR(iobase) (iobase+0)
#define IER(iobase) (iobase+1)
#define IIR(iobase) (iobase+2)
#define FCR(iobase) (iobase+2)
#define LCR(iobase) (iobase+3)
#define MCR(iobase) (iobase+4)
#define LSR(iobase) (iobase+5)
#define MSR(iobase) (iobase+6)
#define SCR(iobase) (iobase+7)
#define DLL(iobase) (iobase+0)
#define DLM(iobase) (iobase+1)

#define SER12_EXTENT 8

/* ---------------------------------------------------------------------- */
/*
 * Information that need to be kept for each board.
 */

struct baycom_state {
	struct hdlcdrv_state hdrv;

	unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
	int opt_dcd;

	struct modem_state {
		unsigned char flags;
		unsigned char ptt;
		unsigned int shreg;
		struct modem_state_ser12 {
			unsigned char tx_bit;
			unsigned char last_rxbit;
			int dcd_sum0, dcd_sum1, dcd_sum2;
			int dcd_time;
			unsigned int pll_time;
			unsigned int txshreg;
		} ser12;
	} modem;

#ifdef BAYCOM_DEBUG
	struct debug_vals {
		unsigned long last_jiffies;
		unsigned cur_intcnt;
		unsigned last_intcnt;
		int cur_pllcorr;
		int last_pllcorr;
	} debug_vals;
#endif /* BAYCOM_DEBUG */
};

/* --------------------------------------------------------------------- */

static inline void baycom_int_freq(struct baycom_state *bc)
{
#ifdef BAYCOM_DEBUG
	unsigned long cur_jiffies = jiffies;
	/*
	 * measure the interrupt frequency
	 */
	bc->debug_vals.cur_intcnt++;
	if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
		bc->debug_vals.last_jiffies = cur_jiffies;
		bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
		bc->debug_vals.cur_intcnt = 0;
		bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
		bc->debug_vals.cur_pllcorr = 0;
	}
#endif /* BAYCOM_DEBUG */
}

/* --------------------------------------------------------------------- */
/*
 * ===================== SER12 specific routines =========================
 */

/* --------------------------------------------------------------------- */

static inline void ser12_set_divisor(struct net_device *dev,
                                     unsigned int divisor)
{
        outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
        outb(divisor, DLL(dev->base_addr));
        outb(divisor >> 8, DLM(dev->base_addr));
        outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
        /*
         * make sure the next interrupt is generated;
         * 0 must be used to power the modem; the modem draws its
         * power from the TxD line
         */
        outb(0x00, THR(dev->base_addr));
        /*
         * it is important not to set the divider while transmitting;
         * this reportedly makes some UARTs generating interrupts
         * in the hundredthousands per second region
         * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
         */
}

/* --------------------------------------------------------------------- */

#if 0
static inline unsigned int hweight16(unsigned int w)
        __attribute__ ((unused));
static inline unsigned int hweight8(unsigned int w)
        __attribute__ ((unused));

static inline unsigned int hweight16(unsigned int w)
{
        unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
        res = (res & 0x3333) + ((res >> 2) & 0x3333);
        res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
        return (res & 0x00FF) + ((res >> 8) & 0x00FF);
}

static inline unsigned int hweight8(unsigned int w)
{
        unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
        res = (res & 0x33) + ((res >> 2) & 0x33);
        return (res & 0x0F) + ((res >> 4) & 0x0F);
}
#endif

/* --------------------------------------------------------------------- */

static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
{
	int timediff;
	int bdus8 = bc->baud_us >> 3;
	int bdus4 = bc->baud_us >> 2;
	int bdus2 = bc->baud_us >> 1;

	timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
					bc->modem.ser12.pll_time;
	while (timediff >= 500000)
		timediff -= 1000000;
	while (timediff >= bdus2) {
		timediff -= bc->baud_us;
		bc->modem.ser12.pll_time += bc->baud_us;
		bc->modem.ser12.dcd_time--;
		/* first check if there is room to add a bit */
		if (bc->modem.shreg & 1) {
			hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
			bc->modem.shreg = 0x10000;
		}
		/* add a one bit */
		bc->modem.shreg >>= 1;
	}
	if (bc->modem.ser12.dcd_time <= 0) {
		if (!bc->opt_dcd)
			hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 + 
						   bc->modem.ser12.dcd_sum1 + 
						   bc->modem.ser12.dcd_sum2) < 0);
		bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
		bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
		bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
		bc->modem.ser12.dcd_time += 120;
	}
	if (bc->modem.ser12.last_rxbit != curs) {
		bc->modem.ser12.last_rxbit = curs;
		bc->modem.shreg |= 0x10000;
		/* adjust the PLL */
		if (timediff > 0)
			bc->modem.ser12.pll_time += bdus8;
		else
			bc->modem.ser12.pll_time += 1000000 - bdus8;
		/* update DCD */
		if (abs(timediff) > bdus4)
			bc->modem.ser12.dcd_sum0 += 4;
		else
			bc->modem.ser12.dcd_sum0--;
#ifdef BAYCOM_DEBUG
		bc->debug_vals.cur_pllcorr = timediff;
#endif /* BAYCOM_DEBUG */
	}
	while (bc->modem.ser12.pll_time >= 1000000)
		bc->modem.ser12.pll_time -= 1000000;
}

/* --------------------------------------------------------------------- */

static irqreturn_t ser12_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct baycom_state *bc = netdev_priv(dev);
	struct timespec64 ts;
	unsigned char iir, msr;
	unsigned int txcount = 0;

	if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
		return IRQ_NONE;
	/* fast way out for shared irq */
	if ((iir = inb(IIR(dev->base_addr))) & 1) 	
		return IRQ_NONE;
	/* get current time */
	ktime_get_ts64(&ts);
	msr = inb(MSR(dev->base_addr));
	/* delta DCD */
	if ((msr & 8) && bc->opt_dcd)
		hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
	do {
		switch (iir & 6) {
		case 6:
			inb(LSR(dev->base_addr));
			break;
			
		case 4:
			inb(RBR(dev->base_addr));
			break;
			
		case 2:
			/*
			 * make sure the next interrupt is generated;
			 * 0 must be used to power the modem; the modem draws its
			 * power from the TxD line
			 */
			outb(0x00, THR(dev->base_addr));
			baycom_int_freq(bc);
			txcount++;
			/*
			 * first output the last bit (!) then call HDLC transmitter,
			 * since this may take quite long
			 */
			if (bc->modem.ptt)
				outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
			else
				outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
			break;
			
		default:
			msr = inb(MSR(dev->base_addr));
			/* delta DCD */
			if ((msr & 8) && bc->opt_dcd) 
				hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
			break;
		}
		iir = inb(IIR(dev->base_addr));
	} while (!(iir & 1));
	ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
	if (bc->modem.ptt && txcount) {
		if (bc->modem.ser12.txshreg <= 1) {
			bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
			if (!hdlcdrv_ptt(&bc->hdrv)) {
				ser12_set_divisor(dev, 115200/100/8);
				bc->modem.ptt = 0;
				goto end_transmit;
			}
		}
		bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
		bc->modem.ser12.txshreg >>= 1;
	}
 end_transmit:
	local_irq_enable();
	if (!bc->modem.ptt && txcount) {
		hdlcdrv_arbitrate(dev, &bc->hdrv);
		if (hdlcdrv_ptt(&bc->hdrv)) {
			ser12_set_divisor(dev, bc->baud_uartdiv);
			bc->modem.ser12.txshreg = 1;
			bc->modem.ptt = 1;
		}
	}
	hdlcdrv_transmitter(dev, &bc->hdrv);
	hdlcdrv_receiver(dev, &bc->hdrv);
	local_irq_disable();
	return IRQ_HANDLED;
}

/* --------------------------------------------------------------------- */

enum uart { c_uart_unknown, c_uart_8250,
	    c_uart_16450, c_uart_16550, c_uart_16550A};
static const char *uart_str[] = { 
	"unknown", "8250", "16450", "16550", "16550A" 
};

static enum uart ser12_check_uart(unsigned int iobase)
{
	unsigned char b1,b2,b3;
	enum uart u;
	enum uart uart_tab[] =
		{ c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };

	b1 = inb(MCR(iobase));
	outb(b1 | 0x10, MCR(iobase));	/* loopback mode */
	b2 = inb(MSR(iobase));
	outb(0x1a, MCR(iobase));
	b3 = inb(MSR(iobase)) & 0xf0;
	outb(b1, MCR(iobase));			/* restore old values */
	outb(b2, MSR(iobase));
	if (b3 != 0x90)
		return c_uart_unknown;
	inb(RBR(iobase));
	inb(RBR(iobase));
	outb(0x01, FCR(iobase));		/* enable FIFOs */
	u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
	if (u == c_uart_16450) {
		outb(0x5a, SCR(iobase));
		b1 = inb(SCR(iobase));
		outb(0xa5, SCR(iobase));
		b2 = inb(SCR(iobase));
		if ((b1 != 0x5a) || (b2 != 0xa5))
			u = c_uart_8250;
	}
	return u;
}

/* --------------------------------------------------------------------- */

static int ser12_open(struct net_device *dev)
{
	struct baycom_state *bc = netdev_priv(dev);
	enum uart u;

	if (!dev || !bc)
		return -ENXIO;
	if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
	    dev->irq < 2 || dev->irq > nr_irqs) {
		printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
				"or irq (2 <= irq <= %d)\n",
				0xffff-SER12_EXTENT, nr_irqs);
		return -ENXIO;
	}
	if (bc->baud < 300 || bc->baud > 4800) {
		printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
				"(300...4800)\n");
		return -EINVAL;
	}
	if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
		printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
		       dev->base_addr);
		return -EACCES;
	}
	memset(&bc->modem, 0, sizeof(bc->modem));
	bc->hdrv.par.bitrate = bc->baud;
	bc->baud_us = 1000000/bc->baud;
	bc->baud_uartdiv = (115200/8)/bc->baud;
	if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
		release_region(dev->base_addr, SER12_EXTENT);
		return -EIO;
	}
	outb(0, FCR(dev->base_addr));  /* disable FIFOs */
	outb(0x0d, MCR(dev->base_addr));
	outb(0, IER(dev->base_addr));
	if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED,
			"baycom_ser_fdx", dev)) {
		release_region(dev->base_addr, SER12_EXTENT);
		return -EBUSY;
	}
	/*
	 * set the SIO to 6 Bits/character; during receive,
	 * the baud rate is set to produce 100 ints/sec
	 * to feed the channel arbitration process,
	 * during transmit to baud ints/sec to run
	 * the transmitter
	 */
	ser12_set_divisor(dev, 115200/100/8);
	/*
	 * enable transmitter empty interrupt and modem status interrupt
	 */
	outb(0x0a, IER(dev->base_addr));
	/*
	 * make sure the next interrupt is generated;
	 * 0 must be used to power the modem; the modem draws its
	 * power from the TxD line
	 */
	outb(0x00, THR(dev->base_addr));
	hdlcdrv_setdcd(&bc->hdrv, 0);
	printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
	       bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
	return 0;
}

/* --------------------------------------------------------------------- */

static int ser12_close(struct net_device *dev)
{
	struct baycom_state *bc = netdev_priv(dev);

	if (!dev || !bc)
		return -EINVAL;
	/*
	 * disable interrupts
	 */
	outb(0, IER(dev->base_addr));
	outb(1, MCR(dev->base_addr));
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, SER12_EXTENT);
	printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
	       bc_drvname, dev->base_addr, dev->irq);
	return 0;
}

/* --------------------------------------------------------------------- */
/*
 * ===================== hdlcdrv driver interface =========================
 */

/* --------------------------------------------------------------------- */

static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
			struct hdlcdrv_ioctl *hi, int cmd);

/* --------------------------------------------------------------------- */

static struct hdlcdrv_ops ser12_ops = {
	.drvname = bc_drvname,
	.drvinfo = bc_drvinfo,
	.open    = ser12_open,
	.close   = ser12_close,
	.ioctl   = baycom_ioctl,
};

/* --------------------------------------------------------------------- */

static int baycom_setmode(struct baycom_state *bc, const char *modestr)
{
	unsigned int baud;

	if (!strncmp(modestr, "ser", 3)) {
		baud = simple_strtoul(modestr+3, NULL, 10);
		if (baud >= 3 && baud <= 48)
			bc->baud = baud*100;
	}
	if (strchr(modestr, '*'))
		bc->opt_dcd = 0;
	else if (strchr(modestr, '+'))
		bc->opt_dcd = -1;
	else
		bc->opt_dcd = 1;
	return 0;
}

/* --------------------------------------------------------------------- */

static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
			struct hdlcdrv_ioctl *hi, int cmd)
{
	struct baycom_state *bc;
	struct baycom_ioctl bi;

	if (!dev)
		return -EINVAL;

	bc = netdev_priv(dev);
	BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);

	if (cmd != SIOCDEVPRIVATE)
		return -ENOIOCTLCMD;
	switch (hi->cmd) {
	default:
		break;

	case HDLCDRVCTL_GETMODE:
		sprintf(hi->data.modename, "ser%u", bc->baud / 100);
		if (bc->opt_dcd <= 0)
			strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
			return -EFAULT;
		return 0;

	case HDLCDRVCTL_SETMODE:
		if (netif_running(dev) || !capable(CAP_NET_ADMIN))
			return -EACCES;
		hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
		return baycom_setmode(bc, hi->data.modename);

	case HDLCDRVCTL_MODELIST:
		strcpy(hi->data.modename, "ser12,ser3,ser24");
		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
			return -EFAULT;
		return 0;

	case HDLCDRVCTL_MODEMPARMASK:
		return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;

	}

	if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
		return -EFAULT;
	switch (bi.cmd) {
	default:
		return -ENOIOCTLCMD;

#ifdef BAYCOM_DEBUG
	case BAYCOMCTL_GETDEBUG:
		bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
		bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
		bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
		break;
#endif /* BAYCOM_DEBUG */

	}
	if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
		return -EFAULT;
	return 0;

}

/* --------------------------------------------------------------------- */

/*
 * command line settable parameters
 */
static char *mode[NR_PORTS] = { "ser12*", };
static int iobase[NR_PORTS] = { 0x3f8, };
static int irq[NR_PORTS] = { 4, };
static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };

module_param_array(mode, charp, NULL, 0);
MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
module_param_array(iobase, int, NULL, 0);
MODULE_PARM_DESC(iobase, "baycom io base address");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "baycom irq number");
module_param_array(baud, int, NULL, 0);
MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");

MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
MODULE_LICENSE("GPL");

/* --------------------------------------------------------------------- */

static int __init init_baycomserfdx(void)
{
	int i, found = 0;
	char set_hw = 1;

	printk(bc_drvinfo);
	/*
	 * register net devices
	 */
	for (i = 0; i < NR_PORTS; i++) {
		struct net_device *dev;
		struct baycom_state *bc;
		char ifname[IFNAMSIZ];

		sprintf(ifname, "bcsf%d", i);

		if (!mode[i])
			set_hw = 0;
		if (!set_hw)
			iobase[i] = irq[i] = 0;

		dev = hdlcdrv_register(&ser12_ops, 
				       sizeof(struct baycom_state),
				       ifname, iobase[i], irq[i], 0);
		if (IS_ERR(dev)) 
			break;

		bc = netdev_priv(dev);
		if (set_hw && baycom_setmode(bc, mode[i]))
			set_hw = 0;
		bc->baud = baud[i];
		found++;
		baycom_device[i] = dev;
	}

	if (!found)
		return -ENXIO;
	return 0;
}

static void __exit cleanup_baycomserfdx(void)
{
	int i;

	for(i = 0; i < NR_PORTS; i++) {
		struct net_device *dev = baycom_device[i];
		if (dev) 
			hdlcdrv_unregister(dev);
	}
}

module_init(init_baycomserfdx);
module_exit(cleanup_baycomserfdx);

/* --------------------------------------------------------------------- */

#ifndef MODULE

/*
 * format: baycom_ser_fdx=io,irq,mode
 * mode: ser#    hardware DCD
 *       ser#*   software DCD
 *       ser#+   hardware DCD, inverted signal at DCD pin
 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
 */

static int __init baycom_ser_fdx_setup(char *str)
{
        static unsigned nr_dev;
        int ints[4];

        if (nr_dev >= NR_PORTS)
                return 0;
        str = get_options(str, 4, ints);
        if (ints[0] < 2)
                return 0;
        mode[nr_dev] = str;
        iobase[nr_dev] = ints[1];
        irq[nr_dev] = ints[2];
	if (ints[0] >= 3)
		baud[nr_dev] = ints[3];
	nr_dev++;
	return 1;
}

__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);

#endif /* MODULE */
/* --------------------------------------------------------------------- */