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