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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*****************************************************************************/
3
4/*
5 * baycom_ser_fdx.c -- baycom ser12 fullduplex radio modem driver.
6 *
7 * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * Please note that the GPL allows you to use the driver, NOT the radio.
10 * In order to use the radio, you need a license from the communications
11 * authority of your country.
12 *
13 * Supported modems
14 *
15 * ser12: This is a very simple 1200 baud AFSK modem. The modem consists only
16 * of a modulator/demodulator chip, usually a TI TCM3105. The computer
17 * is responsible for regenerating the receiver bit clock, as well as
18 * for handling the HDLC protocol. The modem connects to a serial port,
19 * hence the name. Since the serial port is not used as an async serial
20 * port, the kernel driver for serial ports cannot be used, and this
21 * driver only supports standard serial hardware (8250, 16450, 16550A)
22 *
23 * This modem usually draws its supply current out of the otherwise unused
24 * TXD pin of the serial port. Thus a contiguous stream of 0x00-bytes
25 * is transmitted to achieve a positive supply voltage.
26 *
27 * hsk: This is a 4800 baud FSK modem, designed for TNC use. It works fine
28 * in 'baycom-mode' :-) In contrast to the TCM3105 modem, power is
29 * externally supplied. So there's no need to provide the 0x00-byte-stream
30 * when receiving or idle, which drastically reduces interrupt load.
31 *
32 * Command line options (insmod command line)
33 *
34 * mode ser# hardware DCD
35 * ser#* software DCD
36 * ser#+ hardware DCD, inverted signal at DCD pin
37 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
38 * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
39 * baud baud rate (between 300 and 4800)
40 * irq interrupt line of the port; common values are 4,3
41 *
42 * History:
43 * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface
44 * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user)
45 * 0.3 26.04.1997 init code/data tagged
46 * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints)
47 * 0.5 11.11.1997 ser12/par96 split into separate files
48 * 0.6 24.01.1998 Thorsten Kranzkowski, dl8bcu and Thomas Sailer:
49 * reduced interrupt load in transmit case
50 * reworked receiver
51 * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall
52 * 0.8 10.08.1999 use module_init/module_exit
53 * 0.9 12.02.2000 adapted to softnet driver interface
54 * 0.10 03.07.2000 fix interface name handling
55 */
56
57/*****************************************************************************/
58
59#include <linux/capability.h>
60#include <linux/module.h>
61#include <linux/ioport.h>
62#include <linux/string.h>
63#include <linux/init.h>
64#include <linux/interrupt.h>
65#include <linux/hdlcdrv.h>
66#include <linux/baycom.h>
67#include <linux/jiffies.h>
68#include <linux/time64.h>
69
70#include <linux/uaccess.h>
71#include <asm/io.h>
72#include <asm/irq.h>
73
74/* --------------------------------------------------------------------- */
75
76#define BAYCOM_DEBUG
77
78/* --------------------------------------------------------------------- */
79
80static const char bc_drvname[] = "baycom_ser_fdx";
81static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
82"baycom_ser_fdx: version 0.10\n";
83
84/* --------------------------------------------------------------------- */
85
86#define NR_PORTS 4
87
88static 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
112struct baycom_state {
113 struct hdlcdrv_state hdrv;
114
115 unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
116 int opt_dcd;
117
118 struct modem_state {
119 unsigned char flags;
120 unsigned char ptt;
121 unsigned int shreg;
122 struct modem_state_ser12 {
123 unsigned char tx_bit;
124 unsigned char last_rxbit;
125 int dcd_sum0, dcd_sum1, dcd_sum2;
126 int dcd_time;
127 unsigned int pll_time;
128 unsigned int txshreg;
129 } ser12;
130 } modem;
131
132#ifdef BAYCOM_DEBUG
133 struct debug_vals {
134 unsigned long last_jiffies;
135 unsigned cur_intcnt;
136 unsigned last_intcnt;
137 int cur_pllcorr;
138 int last_pllcorr;
139 } debug_vals;
140#endif /* BAYCOM_DEBUG */
141};
142
143/* --------------------------------------------------------------------- */
144
145static inline void baycom_int_freq(struct baycom_state *bc)
146{
147#ifdef BAYCOM_DEBUG
148 unsigned long cur_jiffies = jiffies;
149 /*
150 * measure the interrupt frequency
151 */
152 bc->debug_vals.cur_intcnt++;
153 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
154 bc->debug_vals.last_jiffies = cur_jiffies;
155 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
156 bc->debug_vals.cur_intcnt = 0;
157 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
158 bc->debug_vals.cur_pllcorr = 0;
159 }
160#endif /* BAYCOM_DEBUG */
161}
162
163/* --------------------------------------------------------------------- */
164/*
165 * ===================== SER12 specific routines =========================
166 */
167
168/* --------------------------------------------------------------------- */
169
170static inline void ser12_set_divisor(struct net_device *dev,
171 unsigned int divisor)
172{
173 outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */
174 outb(divisor, DLL(dev->base_addr));
175 outb(divisor >> 8, DLM(dev->base_addr));
176 outb(0x01, LCR(dev->base_addr)); /* word length = 6 */
177 /*
178 * make sure the next interrupt is generated;
179 * 0 must be used to power the modem; the modem draws its
180 * power from the TxD line
181 */
182 outb(0x00, THR(dev->base_addr));
183 /*
184 * it is important not to set the divider while transmitting;
185 * this reportedly makes some UARTs generating interrupts
186 * in the hundredthousands per second region
187 * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
188 */
189}
190
191static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
192{
193 int timediff;
194 int bdus8 = bc->baud_us >> 3;
195 int bdus4 = bc->baud_us >> 2;
196 int bdus2 = bc->baud_us >> 1;
197
198 timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
199 bc->modem.ser12.pll_time;
200 while (timediff >= 500000)
201 timediff -= 1000000;
202 while (timediff >= bdus2) {
203 timediff -= bc->baud_us;
204 bc->modem.ser12.pll_time += bc->baud_us;
205 bc->modem.ser12.dcd_time--;
206 /* first check if there is room to add a bit */
207 if (bc->modem.shreg & 1) {
208 hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
209 bc->modem.shreg = 0x10000;
210 }
211 /* add a one bit */
212 bc->modem.shreg >>= 1;
213 }
214 if (bc->modem.ser12.dcd_time <= 0) {
215 if (!bc->opt_dcd)
216 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
217 bc->modem.ser12.dcd_sum1 +
218 bc->modem.ser12.dcd_sum2) < 0);
219 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
220 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
221 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
222 bc->modem.ser12.dcd_time += 120;
223 }
224 if (bc->modem.ser12.last_rxbit != curs) {
225 bc->modem.ser12.last_rxbit = curs;
226 bc->modem.shreg |= 0x10000;
227 /* adjust the PLL */
228 if (timediff > 0)
229 bc->modem.ser12.pll_time += bdus8;
230 else
231 bc->modem.ser12.pll_time += 1000000 - bdus8;
232 /* update DCD */
233 if (abs(timediff) > bdus4)
234 bc->modem.ser12.dcd_sum0 += 4;
235 else
236 bc->modem.ser12.dcd_sum0--;
237#ifdef BAYCOM_DEBUG
238 bc->debug_vals.cur_pllcorr = timediff;
239#endif /* BAYCOM_DEBUG */
240 }
241 while (bc->modem.ser12.pll_time >= 1000000)
242 bc->modem.ser12.pll_time -= 1000000;
243}
244
245/* --------------------------------------------------------------------- */
246
247static irqreturn_t ser12_interrupt(int irq, void *dev_id)
248{
249 struct net_device *dev = (struct net_device *)dev_id;
250 struct baycom_state *bc = netdev_priv(dev);
251 struct timespec64 ts;
252 unsigned char iir, msr;
253 unsigned int txcount = 0;
254
255 if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
256 return IRQ_NONE;
257 /* fast way out for shared irq */
258 if ((iir = inb(IIR(dev->base_addr))) & 1)
259 return IRQ_NONE;
260 /* get current time */
261 ktime_get_ts64(&ts);
262 msr = inb(MSR(dev->base_addr));
263 /* delta DCD */
264 if ((msr & 8) && bc->opt_dcd)
265 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
266 do {
267 switch (iir & 6) {
268 case 6:
269 inb(LSR(dev->base_addr));
270 break;
271
272 case 4:
273 inb(RBR(dev->base_addr));
274 break;
275
276 case 2:
277 /*
278 * make sure the next interrupt is generated;
279 * 0 must be used to power the modem; the modem draws its
280 * power from the TxD line
281 */
282 outb(0x00, THR(dev->base_addr));
283 baycom_int_freq(bc);
284 txcount++;
285 /*
286 * first output the last bit (!) then call HDLC transmitter,
287 * since this may take quite long
288 */
289 if (bc->modem.ptt)
290 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
291 else
292 outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
293 break;
294
295 default:
296 msr = inb(MSR(dev->base_addr));
297 /* delta DCD */
298 if ((msr & 8) && bc->opt_dcd)
299 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
300 break;
301 }
302 iir = inb(IIR(dev->base_addr));
303 } while (!(iir & 1));
304 ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
305 if (bc->modem.ptt && txcount) {
306 if (bc->modem.ser12.txshreg <= 1) {
307 bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
308 if (!hdlcdrv_ptt(&bc->hdrv)) {
309 ser12_set_divisor(dev, 115200/100/8);
310 bc->modem.ptt = 0;
311 goto end_transmit;
312 }
313 }
314 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
315 bc->modem.ser12.txshreg >>= 1;
316 }
317 end_transmit:
318 local_irq_enable();
319 if (!bc->modem.ptt && txcount) {
320 hdlcdrv_arbitrate(dev, &bc->hdrv);
321 if (hdlcdrv_ptt(&bc->hdrv)) {
322 ser12_set_divisor(dev, bc->baud_uartdiv);
323 bc->modem.ser12.txshreg = 1;
324 bc->modem.ptt = 1;
325 }
326 }
327 hdlcdrv_transmitter(dev, &bc->hdrv);
328 hdlcdrv_receiver(dev, &bc->hdrv);
329 local_irq_disable();
330 return IRQ_HANDLED;
331}
332
333/* --------------------------------------------------------------------- */
334
335enum uart { c_uart_unknown, c_uart_8250,
336 c_uart_16450, c_uart_16550, c_uart_16550A};
337static const char *uart_str[] = {
338 "unknown", "8250", "16450", "16550", "16550A"
339};
340
341static enum uart ser12_check_uart(unsigned int iobase)
342{
343 unsigned char b1,b2,b3;
344 enum uart u;
345 enum uart uart_tab[] =
346 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
347
348 b1 = inb(MCR(iobase));
349 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
350 b2 = inb(MSR(iobase));
351 outb(0x1a, MCR(iobase));
352 b3 = inb(MSR(iobase)) & 0xf0;
353 outb(b1, MCR(iobase)); /* restore old values */
354 outb(b2, MSR(iobase));
355 if (b3 != 0x90)
356 return c_uart_unknown;
357 inb(RBR(iobase));
358 inb(RBR(iobase));
359 outb(0x01, FCR(iobase)); /* enable FIFOs */
360 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
361 if (u == c_uart_16450) {
362 outb(0x5a, SCR(iobase));
363 b1 = inb(SCR(iobase));
364 outb(0xa5, SCR(iobase));
365 b2 = inb(SCR(iobase));
366 if ((b1 != 0x5a) || (b2 != 0xa5))
367 u = c_uart_8250;
368 }
369 return u;
370}
371
372/* --------------------------------------------------------------------- */
373
374static int ser12_open(struct net_device *dev)
375{
376 struct baycom_state *bc = netdev_priv(dev);
377 enum uart u;
378
379 if (!dev || !bc)
380 return -ENXIO;
381 if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
382 dev->irq < 2 || dev->irq > nr_irqs) {
383 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
384 "or irq (2 <= irq <= %d)\n",
385 0xffff-SER12_EXTENT, nr_irqs);
386 return -ENXIO;
387 }
388 if (bc->baud < 300 || bc->baud > 4800) {
389 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
390 "(300...4800)\n");
391 return -EINVAL;
392 }
393 if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
394 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
395 dev->base_addr);
396 return -EACCES;
397 }
398 memset(&bc->modem, 0, sizeof(bc->modem));
399 bc->hdrv.par.bitrate = bc->baud;
400 bc->baud_us = 1000000/bc->baud;
401 bc->baud_uartdiv = (115200/8)/bc->baud;
402 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
403 release_region(dev->base_addr, SER12_EXTENT);
404 return -EIO;
405 }
406 outb(0, FCR(dev->base_addr)); /* disable FIFOs */
407 outb(0x0d, MCR(dev->base_addr));
408 outb(0, IER(dev->base_addr));
409 if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED,
410 "baycom_ser_fdx", dev)) {
411 release_region(dev->base_addr, SER12_EXTENT);
412 return -EBUSY;
413 }
414 /*
415 * set the SIO to 6 Bits/character; during receive,
416 * the baud rate is set to produce 100 ints/sec
417 * to feed the channel arbitration process,
418 * during transmit to baud ints/sec to run
419 * the transmitter
420 */
421 ser12_set_divisor(dev, 115200/100/8);
422 /*
423 * enable transmitter empty interrupt and modem status interrupt
424 */
425 outb(0x0a, IER(dev->base_addr));
426 /*
427 * make sure the next interrupt is generated;
428 * 0 must be used to power the modem; the modem draws its
429 * power from the TxD line
430 */
431 outb(0x00, THR(dev->base_addr));
432 hdlcdrv_setdcd(&bc->hdrv, 0);
433 printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
434 bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
435 return 0;
436}
437
438/* --------------------------------------------------------------------- */
439
440static int ser12_close(struct net_device *dev)
441{
442 struct baycom_state *bc = netdev_priv(dev);
443
444 if (!dev || !bc)
445 return -EINVAL;
446 /*
447 * disable interrupts
448 */
449 outb(0, IER(dev->base_addr));
450 outb(1, MCR(dev->base_addr));
451 free_irq(dev->irq, dev);
452 release_region(dev->base_addr, SER12_EXTENT);
453 printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
454 bc_drvname, dev->base_addr, dev->irq);
455 return 0;
456}
457
458/* --------------------------------------------------------------------- */
459/*
460 * ===================== hdlcdrv driver interface =========================
461 */
462
463/* --------------------------------------------------------------------- */
464
465static int baycom_ioctl(struct net_device *dev, void __user *data,
466 struct hdlcdrv_ioctl *hi, int cmd);
467
468/* --------------------------------------------------------------------- */
469
470static const struct hdlcdrv_ops ser12_ops = {
471 .drvname = bc_drvname,
472 .drvinfo = bc_drvinfo,
473 .open = ser12_open,
474 .close = ser12_close,
475 .ioctl = baycom_ioctl,
476};
477
478/* --------------------------------------------------------------------- */
479
480static int baycom_setmode(struct baycom_state *bc, const char *modestr)
481{
482 unsigned int baud;
483
484 if (!strncmp(modestr, "ser", 3)) {
485 baud = simple_strtoul(modestr+3, NULL, 10);
486 if (baud >= 3 && baud <= 48)
487 bc->baud = baud*100;
488 }
489 if (strchr(modestr, '*'))
490 bc->opt_dcd = 0;
491 else if (strchr(modestr, '+'))
492 bc->opt_dcd = -1;
493 else
494 bc->opt_dcd = 1;
495 return 0;
496}
497
498/* --------------------------------------------------------------------- */
499
500static int baycom_ioctl(struct net_device *dev, void __user *data,
501 struct hdlcdrv_ioctl *hi, int cmd)
502{
503 struct baycom_state *bc;
504 struct baycom_ioctl bi;
505
506 if (!dev)
507 return -EINVAL;
508
509 bc = netdev_priv(dev);
510 BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
511
512 if (cmd != SIOCDEVPRIVATE)
513 return -ENOIOCTLCMD;
514 switch (hi->cmd) {
515 default:
516 break;
517
518 case HDLCDRVCTL_GETMODE:
519 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
520 if (bc->opt_dcd <= 0)
521 strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
522 if (copy_to_user(data, hi, sizeof(struct hdlcdrv_ioctl)))
523 return -EFAULT;
524 return 0;
525
526 case HDLCDRVCTL_SETMODE:
527 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
528 return -EACCES;
529 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
530 return baycom_setmode(bc, hi->data.modename);
531
532 case HDLCDRVCTL_MODELIST:
533 strcpy(hi->data.modename, "ser12,ser3,ser24");
534 if (copy_to_user(data, hi, sizeof(struct hdlcdrv_ioctl)))
535 return -EFAULT;
536 return 0;
537
538 case HDLCDRVCTL_MODEMPARMASK:
539 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
540
541 }
542
543 if (copy_from_user(&bi, data, sizeof(bi)))
544 return -EFAULT;
545 switch (bi.cmd) {
546 default:
547 return -ENOIOCTLCMD;
548
549#ifdef BAYCOM_DEBUG
550 case BAYCOMCTL_GETDEBUG:
551 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
552 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
553 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
554 break;
555#endif /* BAYCOM_DEBUG */
556
557 }
558 if (copy_to_user(data, &bi, sizeof(bi)))
559 return -EFAULT;
560 return 0;
561
562}
563
564/* --------------------------------------------------------------------- */
565
566/*
567 * command line settable parameters
568 */
569static char *mode[NR_PORTS] = { "ser12*", };
570static int iobase[NR_PORTS] = { 0x3f8, };
571static int irq[NR_PORTS] = { 4, };
572static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
573
574module_param_array(mode, charp, NULL, 0);
575MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
576module_param_hw_array(iobase, int, ioport, NULL, 0);
577MODULE_PARM_DESC(iobase, "baycom io base address");
578module_param_hw_array(irq, int, irq, NULL, 0);
579MODULE_PARM_DESC(irq, "baycom irq number");
580module_param_array(baud, int, NULL, 0);
581MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
582
583MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
584MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
585MODULE_LICENSE("GPL");
586
587/* --------------------------------------------------------------------- */
588
589static int __init init_baycomserfdx(void)
590{
591 int i, found = 0;
592 char set_hw = 1;
593
594 printk(bc_drvinfo);
595 /*
596 * register net devices
597 */
598 for (i = 0; i < NR_PORTS; i++) {
599 struct net_device *dev;
600 struct baycom_state *bc;
601 char ifname[IFNAMSIZ];
602
603 sprintf(ifname, "bcsf%d", i);
604
605 if (!mode[i])
606 set_hw = 0;
607 if (!set_hw)
608 iobase[i] = irq[i] = 0;
609
610 dev = hdlcdrv_register(&ser12_ops,
611 sizeof(struct baycom_state),
612 ifname, iobase[i], irq[i], 0);
613 if (IS_ERR(dev))
614 break;
615
616 bc = netdev_priv(dev);
617 if (set_hw && baycom_setmode(bc, mode[i]))
618 set_hw = 0;
619 bc->baud = baud[i];
620 found++;
621 baycom_device[i] = dev;
622 }
623
624 if (!found)
625 return -ENXIO;
626 return 0;
627}
628
629static void __exit cleanup_baycomserfdx(void)
630{
631 int i;
632
633 for(i = 0; i < NR_PORTS; i++) {
634 struct net_device *dev = baycom_device[i];
635 if (dev)
636 hdlcdrv_unregister(dev);
637 }
638}
639
640module_init(init_baycomserfdx);
641module_exit(cleanup_baycomserfdx);
642
643/* --------------------------------------------------------------------- */
644
645#ifndef MODULE
646
647/*
648 * format: baycom_ser_fdx=io,irq,mode
649 * mode: ser# hardware DCD
650 * ser#* software DCD
651 * ser#+ hardware DCD, inverted signal at DCD pin
652 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
653 */
654
655static int __init baycom_ser_fdx_setup(char *str)
656{
657 static unsigned nr_dev;
658 int ints[4];
659
660 if (nr_dev >= NR_PORTS)
661 return 0;
662 str = get_options(str, 4, ints);
663 if (ints[0] < 2)
664 return 0;
665 mode[nr_dev] = str;
666 iobase[nr_dev] = ints[1];
667 irq[nr_dev] = ints[2];
668 if (ints[0] >= 3)
669 baud[nr_dev] = ints[3];
670 nr_dev++;
671 return 1;
672}
673
674__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
675
676#endif /* MODULE */
677/* --------------------------------------------------------------------- */
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
95static const char bc_drvname[] = "baycom_ser_fdx";
96static 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
103static 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
127struct 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
160static 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
185static 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
209static inline unsigned int hweight16(unsigned int w)
210 __attribute__ ((unused));
211static inline unsigned int hweight8(unsigned int w)
212 __attribute__ ((unused));
213
214static 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
222static 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
232static __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
288static 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
376enum uart { c_uart_unknown, c_uart_8250,
377 c_uart_16450, c_uart_16550, c_uart_16550A};
378static const char *uart_str[] = {
379 "unknown", "8250", "16450", "16550", "16550A"
380};
381
382static 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
415static 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
481static 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
506static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
507 struct hdlcdrv_ioctl *hi, int cmd);
508
509/* --------------------------------------------------------------------- */
510
511static 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
521static 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
541static 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 */
610static char *mode[NR_PORTS] = { "ser12*", };
611static int iobase[NR_PORTS] = { 0x3f8, };
612static int irq[NR_PORTS] = { 4, };
613static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
614
615module_param_array(mode, charp, NULL, 0);
616MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
617module_param_array(iobase, int, NULL, 0);
618MODULE_PARM_DESC(iobase, "baycom io base address");
619module_param_array(irq, int, NULL, 0);
620MODULE_PARM_DESC(irq, "baycom irq number");
621module_param_array(baud, int, NULL, 0);
622MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
623
624MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
625MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
626MODULE_LICENSE("GPL");
627
628/* --------------------------------------------------------------------- */
629
630static 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
670static 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
681module_init(init_baycomserfdx);
682module_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
696static 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/* --------------------------------------------------------------------- */