baycom_ser_fdx.c revision af901ca181d92aac3a7dc265144a9081a86d8f39
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/hdlcdrv.h>
80#include <linux/baycom.h>
81#include <linux/jiffies.h>
82
83#include <asm/uaccess.h>
84#include <asm/io.h>
85#include <asm/irq.h>
86
87/* --------------------------------------------------------------------- */
88
89#define BAYCOM_DEBUG
90
91/* --------------------------------------------------------------------- */
92
93static const char bc_drvname[] = "baycom_ser_fdx";
94static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
95"baycom_ser_fdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
96
97/* --------------------------------------------------------------------- */
98
99#define NR_PORTS 4
100
101static struct net_device *baycom_device[NR_PORTS];
102
103/* --------------------------------------------------------------------- */
104
105#define RBR(iobase) (iobase+0)
106#define THR(iobase) (iobase+0)
107#define IER(iobase) (iobase+1)
108#define IIR(iobase) (iobase+2)
109#define FCR(iobase) (iobase+2)
110#define LCR(iobase) (iobase+3)
111#define MCR(iobase) (iobase+4)
112#define LSR(iobase) (iobase+5)
113#define MSR(iobase) (iobase+6)
114#define SCR(iobase) (iobase+7)
115#define DLL(iobase) (iobase+0)
116#define DLM(iobase) (iobase+1)
117
118#define SER12_EXTENT 8
119
120/* ---------------------------------------------------------------------- */
121/*
122 * Information that need to be kept for each board.
123 */
124
125struct baycom_state {
126	struct hdlcdrv_state hdrv;
127
128	unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
129	int opt_dcd;
130
131	struct modem_state {
132		unsigned char flags;
133		unsigned char ptt;
134		unsigned int shreg;
135		struct modem_state_ser12 {
136			unsigned char tx_bit;
137			unsigned char last_rxbit;
138			int dcd_sum0, dcd_sum1, dcd_sum2;
139			int dcd_time;
140			unsigned int pll_time;
141			unsigned int txshreg;
142		} ser12;
143	} modem;
144
145#ifdef BAYCOM_DEBUG
146	struct debug_vals {
147		unsigned long last_jiffies;
148		unsigned cur_intcnt;
149		unsigned last_intcnt;
150		int cur_pllcorr;
151		int last_pllcorr;
152	} debug_vals;
153#endif /* BAYCOM_DEBUG */
154};
155
156/* --------------------------------------------------------------------- */
157
158static inline void baycom_int_freq(struct baycom_state *bc)
159{
160#ifdef BAYCOM_DEBUG
161	unsigned long cur_jiffies = jiffies;
162	/*
163	 * measure the interrupt frequency
164	 */
165	bc->debug_vals.cur_intcnt++;
166	if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
167		bc->debug_vals.last_jiffies = cur_jiffies;
168		bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
169		bc->debug_vals.cur_intcnt = 0;
170		bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
171		bc->debug_vals.cur_pllcorr = 0;
172	}
173#endif /* BAYCOM_DEBUG */
174}
175
176/* --------------------------------------------------------------------- */
177/*
178 * ===================== SER12 specific routines =========================
179 */
180
181/* --------------------------------------------------------------------- */
182
183static inline void ser12_set_divisor(struct net_device *dev,
184                                     unsigned int divisor)
185{
186        outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
187        outb(divisor, DLL(dev->base_addr));
188        outb(divisor >> 8, DLM(dev->base_addr));
189        outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
190        /*
191         * make sure the next interrupt is generated;
192         * 0 must be used to power the modem; the modem draws its
193         * power from the TxD line
194         */
195        outb(0x00, THR(dev->base_addr));
196        /*
197         * it is important not to set the divider while transmitting;
198         * this reportedly makes some UARTs generating interrupts
199         * in the hundredthousands per second region
200         * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
201         */
202}
203
204/* --------------------------------------------------------------------- */
205
206#if 0
207static inline unsigned int hweight16(unsigned int w)
208        __attribute__ ((unused));
209static inline unsigned int hweight8(unsigned int w)
210        __attribute__ ((unused));
211
212static inline unsigned int hweight16(unsigned int w)
213{
214        unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
215        res = (res & 0x3333) + ((res >> 2) & 0x3333);
216        res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
217        return (res & 0x00FF) + ((res >> 8) & 0x00FF);
218}
219
220static inline unsigned int hweight8(unsigned int w)
221{
222        unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
223        res = (res & 0x33) + ((res >> 2) & 0x33);
224        return (res & 0x0F) + ((res >> 4) & 0x0F);
225}
226#endif
227
228/* --------------------------------------------------------------------- */
229
230static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
231{
232	int timediff;
233	int bdus8 = bc->baud_us >> 3;
234	int bdus4 = bc->baud_us >> 2;
235	int bdus2 = bc->baud_us >> 1;
236
237	timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
238	while (timediff >= 500000)
239		timediff -= 1000000;
240	while (timediff >= bdus2) {
241		timediff -= bc->baud_us;
242		bc->modem.ser12.pll_time += bc->baud_us;
243		bc->modem.ser12.dcd_time--;
244		/* first check if there is room to add a bit */
245		if (bc->modem.shreg & 1) {
246			hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
247			bc->modem.shreg = 0x10000;
248		}
249		/* add a one bit */
250		bc->modem.shreg >>= 1;
251	}
252	if (bc->modem.ser12.dcd_time <= 0) {
253		if (!bc->opt_dcd)
254			hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
255						   bc->modem.ser12.dcd_sum1 +
256						   bc->modem.ser12.dcd_sum2) < 0);
257		bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
258		bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
259		bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
260		bc->modem.ser12.dcd_time += 120;
261	}
262	if (bc->modem.ser12.last_rxbit != curs) {
263		bc->modem.ser12.last_rxbit = curs;
264		bc->modem.shreg |= 0x10000;
265		/* adjust the PLL */
266		if (timediff > 0)
267			bc->modem.ser12.pll_time += bdus8;
268		else
269			bc->modem.ser12.pll_time += 1000000 - bdus8;
270		/* update DCD */
271		if (abs(timediff) > bdus4)
272			bc->modem.ser12.dcd_sum0 += 4;
273		else
274			bc->modem.ser12.dcd_sum0--;
275#ifdef BAYCOM_DEBUG
276		bc->debug_vals.cur_pllcorr = timediff;
277#endif /* BAYCOM_DEBUG */
278	}
279	while (bc->modem.ser12.pll_time >= 1000000)
280		bc->modem.ser12.pll_time -= 1000000;
281}
282
283/* --------------------------------------------------------------------- */
284
285static irqreturn_t ser12_interrupt(int irq, void *dev_id)
286{
287	struct net_device *dev = (struct net_device *)dev_id;
288	struct baycom_state *bc = netdev_priv(dev);
289	struct timeval tv;
290	unsigned char iir, msr;
291	unsigned int txcount = 0;
292
293	if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
294		return IRQ_NONE;
295	/* fast way out for shared irq */
296	if ((iir = inb(IIR(dev->base_addr))) & 1)
297		return IRQ_NONE;
298	/* get current time */
299	do_gettimeofday(&tv);
300	msr = inb(MSR(dev->base_addr));
301	/* delta DCD */
302	if ((msr & 8) && bc->opt_dcd)
303		hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
304	do {
305		switch (iir & 6) {
306		case 6:
307			inb(LSR(dev->base_addr));
308			break;
309
310		case 4:
311			inb(RBR(dev->base_addr));
312			break;
313
314		case 2:
315			/*
316			 * make sure the next interrupt is generated;
317			 * 0 must be used to power the modem; the modem draws its
318			 * power from the TxD line
319			 */
320			outb(0x00, THR(dev->base_addr));
321			baycom_int_freq(bc);
322			txcount++;
323			/*
324			 * first output the last bit (!) then call HDLC transmitter,
325			 * since this may take quite long
326			 */
327			if (bc->modem.ptt)
328				outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
329			else
330				outb(0x0d, MCR(dev->base_addr));       /* transmitter off */
331			break;
332
333		default:
334			msr = inb(MSR(dev->base_addr));
335			/* delta DCD */
336			if ((msr & 8) && bc->opt_dcd)
337				hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
338			break;
339		}
340		iir = inb(IIR(dev->base_addr));
341	} while (!(iir & 1));
342	ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
343	if (bc->modem.ptt && txcount) {
344		if (bc->modem.ser12.txshreg <= 1) {
345			bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
346			if (!hdlcdrv_ptt(&bc->hdrv)) {
347				ser12_set_divisor(dev, 115200/100/8);
348				bc->modem.ptt = 0;
349				goto end_transmit;
350			}
351		}
352		bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
353		bc->modem.ser12.txshreg >>= 1;
354	}
355 end_transmit:
356	local_irq_enable();
357	if (!bc->modem.ptt && txcount) {
358		hdlcdrv_arbitrate(dev, &bc->hdrv);
359		if (hdlcdrv_ptt(&bc->hdrv)) {
360			ser12_set_divisor(dev, bc->baud_uartdiv);
361			bc->modem.ser12.txshreg = 1;
362			bc->modem.ptt = 1;
363		}
364	}
365	hdlcdrv_transmitter(dev, &bc->hdrv);
366	hdlcdrv_receiver(dev, &bc->hdrv);
367	local_irq_disable();
368	return IRQ_HANDLED;
369}
370
371/* --------------------------------------------------------------------- */
372
373enum uart { c_uart_unknown, c_uart_8250,
374	    c_uart_16450, c_uart_16550, c_uart_16550A};
375static const char *uart_str[] = {
376	"unknown", "8250", "16450", "16550", "16550A"
377};
378
379static enum uart ser12_check_uart(unsigned int iobase)
380{
381	unsigned char b1,b2,b3;
382	enum uart u;
383	enum uart uart_tab[] =
384		{ c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
385
386	b1 = inb(MCR(iobase));
387	outb(b1 | 0x10, MCR(iobase));	/* loopback mode */
388	b2 = inb(MSR(iobase));
389	outb(0x1a, MCR(iobase));
390	b3 = inb(MSR(iobase)) & 0xf0;
391	outb(b1, MCR(iobase));			/* restore old values */
392	outb(b2, MSR(iobase));
393	if (b3 != 0x90)
394		return c_uart_unknown;
395	inb(RBR(iobase));
396	inb(RBR(iobase));
397	outb(0x01, FCR(iobase));		/* enable FIFOs */
398	u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
399	if (u == c_uart_16450) {
400		outb(0x5a, SCR(iobase));
401		b1 = inb(SCR(iobase));
402		outb(0xa5, SCR(iobase));
403		b2 = inb(SCR(iobase));
404		if ((b1 != 0x5a) || (b2 != 0xa5))
405			u = c_uart_8250;
406	}
407	return u;
408}
409
410/* --------------------------------------------------------------------- */
411
412static int ser12_open(struct net_device *dev)
413{
414	struct baycom_state *bc = netdev_priv(dev);
415	enum uart u;
416
417	if (!dev || !bc)
418		return -ENXIO;
419	if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
420	    dev->irq < 2 || dev->irq > nr_irqs) {
421		printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
422				"or irq (2 <= irq <= %d)\n",
423				0xffff-SER12_EXTENT, nr_irqs);
424		return -ENXIO;
425	}
426	if (bc->baud < 300 || bc->baud > 4800) {
427		printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
428				"(300...4800)\n");
429		return -EINVAL;
430	}
431	if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
432		printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy \n",
433		       dev->base_addr);
434		return -EACCES;
435	}
436	memset(&bc->modem, 0, sizeof(bc->modem));
437	bc->hdrv.par.bitrate = bc->baud;
438	bc->baud_us = 1000000/bc->baud;
439	bc->baud_uartdiv = (115200/8)/bc->baud;
440	if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
441		release_region(dev->base_addr, SER12_EXTENT);
442		return -EIO;
443	}
444	outb(0, FCR(dev->base_addr));  /* disable FIFOs */
445	outb(0x0d, MCR(dev->base_addr));
446	outb(0, IER(dev->base_addr));
447	if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
448			"baycom_ser_fdx", dev)) {
449		release_region(dev->base_addr, SER12_EXTENT);
450		return -EBUSY;
451	}
452	/*
453	 * set the SIO to 6 Bits/character; during receive,
454	 * the baud rate is set to produce 100 ints/sec
455	 * to feed the channel arbitration process,
456	 * during transmit to baud ints/sec to run
457	 * the transmitter
458	 */
459	ser12_set_divisor(dev, 115200/100/8);
460	/*
461	 * enable transmitter empty interrupt and modem status interrupt
462	 */
463	outb(0x0a, IER(dev->base_addr));
464	/*
465	 * make sure the next interrupt is generated;
466	 * 0 must be used to power the modem; the modem draws its
467	 * power from the TxD line
468	 */
469	outb(0x00, THR(dev->base_addr));
470	hdlcdrv_setdcd(&bc->hdrv, 0);
471	printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
472	       bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
473	return 0;
474}
475
476/* --------------------------------------------------------------------- */
477
478static int ser12_close(struct net_device *dev)
479{
480	struct baycom_state *bc = netdev_priv(dev);
481
482	if (!dev || !bc)
483		return -EINVAL;
484	/*
485	 * disable interrupts
486	 */
487	outb(0, IER(dev->base_addr));
488	outb(1, MCR(dev->base_addr));
489	free_irq(dev->irq, dev);
490	release_region(dev->base_addr, SER12_EXTENT);
491	printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
492	       bc_drvname, dev->base_addr, dev->irq);
493	return 0;
494}
495
496/* --------------------------------------------------------------------- */
497/*
498 * ===================== hdlcdrv driver interface =========================
499 */
500
501/* --------------------------------------------------------------------- */
502
503static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
504			struct hdlcdrv_ioctl *hi, int cmd);
505
506/* --------------------------------------------------------------------- */
507
508static struct hdlcdrv_ops ser12_ops = {
509	.drvname = bc_drvname,
510	.drvinfo = bc_drvinfo,
511	.open    = ser12_open,
512	.close   = ser12_close,
513	.ioctl   = baycom_ioctl,
514};
515
516/* --------------------------------------------------------------------- */
517
518static int baycom_setmode(struct baycom_state *bc, const char *modestr)
519{
520	unsigned int baud;
521
522	if (!strncmp(modestr, "ser", 3)) {
523		baud = simple_strtoul(modestr+3, NULL, 10);
524		if (baud >= 3 && baud <= 48)
525			bc->baud = baud*100;
526	}
527	if (strchr(modestr, '*'))
528		bc->opt_dcd = 0;
529	else if (strchr(modestr, '+'))
530		bc->opt_dcd = -1;
531	else
532		bc->opt_dcd = 1;
533	return 0;
534}
535
536/* --------------------------------------------------------------------- */
537
538static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
539			struct hdlcdrv_ioctl *hi, int cmd)
540{
541	struct baycom_state *bc;
542	struct baycom_ioctl bi;
543
544	if (!dev)
545		return -EINVAL;
546
547	bc = netdev_priv(dev);
548	BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
549
550	if (cmd != SIOCDEVPRIVATE)
551		return -ENOIOCTLCMD;
552	switch (hi->cmd) {
553	default:
554		break;
555
556	case HDLCDRVCTL_GETMODE:
557		sprintf(hi->data.modename, "ser%u", bc->baud / 100);
558		if (bc->opt_dcd <= 0)
559			strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
560		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
561			return -EFAULT;
562		return 0;
563
564	case HDLCDRVCTL_SETMODE:
565		if (netif_running(dev) || !capable(CAP_NET_ADMIN))
566			return -EACCES;
567		hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
568		return baycom_setmode(bc, hi->data.modename);
569
570	case HDLCDRVCTL_MODELIST:
571		strcpy(hi->data.modename, "ser12,ser3,ser24");
572		if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
573			return -EFAULT;
574		return 0;
575
576	case HDLCDRVCTL_MODEMPARMASK:
577		return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
578
579	}
580
581	if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
582		return -EFAULT;
583	switch (bi.cmd) {
584	default:
585		return -ENOIOCTLCMD;
586
587#ifdef BAYCOM_DEBUG
588	case BAYCOMCTL_GETDEBUG:
589		bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
590		bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
591		bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
592		break;
593#endif /* BAYCOM_DEBUG */
594
595	}
596	if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
597		return -EFAULT;
598	return 0;
599
600}
601
602/* --------------------------------------------------------------------- */
603
604/*
605 * command line settable parameters
606 */
607static char *mode[NR_PORTS] = { "ser12*", };
608static int iobase[NR_PORTS] = { 0x3f8, };
609static int irq[NR_PORTS] = { 4, };
610static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
611
612module_param_array(mode, charp, NULL, 0);
613MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
614module_param_array(iobase, int, NULL, 0);
615MODULE_PARM_DESC(iobase, "baycom io base address");
616module_param_array(irq, int, NULL, 0);
617MODULE_PARM_DESC(irq, "baycom irq number");
618module_param_array(baud, int, NULL, 0);
619MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
620
621MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
622MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
623MODULE_LICENSE("GPL");
624
625/* --------------------------------------------------------------------- */
626
627static int __init init_baycomserfdx(void)
628{
629	int i, found = 0;
630	char set_hw = 1;
631
632	printk(bc_drvinfo);
633	/*
634	 * register net devices
635	 */
636	for (i = 0; i < NR_PORTS; i++) {
637		struct net_device *dev;
638		struct baycom_state *bc;
639		char ifname[IFNAMSIZ];
640
641		sprintf(ifname, "bcsf%d", i);
642
643		if (!mode[i])
644			set_hw = 0;
645		if (!set_hw)
646			iobase[i] = irq[i] = 0;
647
648		dev = hdlcdrv_register(&ser12_ops,
649				       sizeof(struct baycom_state),
650				       ifname, iobase[i], irq[i], 0);
651		if (IS_ERR(dev))
652			break;
653
654		bc = netdev_priv(dev);
655		if (set_hw && baycom_setmode(bc, mode[i]))
656			set_hw = 0;
657		bc->baud = baud[i];
658		found++;
659		baycom_device[i] = dev;
660	}
661
662	if (!found)
663		return -ENXIO;
664	return 0;
665}
666
667static void __exit cleanup_baycomserfdx(void)
668{
669	int i;
670
671	for(i = 0; i < NR_PORTS; i++) {
672		struct net_device *dev = baycom_device[i];
673		if (dev)
674			hdlcdrv_unregister(dev);
675	}
676}
677
678module_init(init_baycomserfdx);
679module_exit(cleanup_baycomserfdx);
680
681/* --------------------------------------------------------------------- */
682
683#ifndef MODULE
684
685/*
686 * format: baycom_ser_fdx=io,irq,mode
687 * mode: ser#    hardware DCD
688 *       ser#*   software DCD
689 *       ser#+   hardware DCD, inverted signal at DCD pin
690 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
691 */
692
693static int __init baycom_ser_fdx_setup(char *str)
694{
695        static unsigned nr_dev;
696        int ints[4];
697
698        if (nr_dev >= NR_PORTS)
699                return 0;
700        str = get_options(str, 4, ints);
701        if (ints[0] < 2)
702                return 0;
703        mode[nr_dev] = str;
704        iobase[nr_dev] = ints[1];
705        irq[nr_dev] = ints[2];
706	if (ints[0] >= 3)
707		baud[nr_dev] = ints[3];
708	nr_dev++;
709	return 1;
710}
711
712__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
713
714#endif /* MODULE */
715/* --------------------------------------------------------------------- */
716