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[linux-2.6-block.git] / drivers / net / hamradio / baycom_ser_fdx.c
CommitLineData
1da177e4
LT		 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
af901ca1 38 * TXD pin of the serial port. Thus a contiguous stream of 0x00-bytes
1da177e4
LT		 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
d43c36dc 74#include <linux/capability.h>
1da177e4
LT		 75#include <linux/module.h>
76#include <linux/ioport.h>
77#include <linux/string.h>
78#include <linux/init.h>
a6b7a407 79#include <linux/interrupt.h>
1da177e4
LT		 80#include <linux/hdlcdrv.h>
81#include <linux/baycom.h>
cd8749b4 82#include <linux/jiffies.h>
e6515203 83#include <linux/time64.h>
1da177e4 84
7c0f6ba6 85#include <linux/uaccess.h>
5efb764c
AM		 86#include <asm/io.h>
87#include <asm/irq.h>
88
1da177e4
LT		 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"
c1afba3c 97"baycom_ser_fdx: version 0.10\n";
1da177e4
LT		 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++;
cd8749b4 168 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
1da177e4
LT		 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
e6515203 206static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timespec64 *ts, unsigned char curs)
1da177e4
LT		 207{
208 int timediff;
209 int bdus8 = bc->baud_us >> 3;
210 int bdus4 = bc->baud_us >> 2;
211 int bdus2 = bc->baud_us >> 1;
212
e6515203
AKC		 213 timediff = 1000000 + ts->tv_nsec / NSEC_PER_USEC -
214 bc->modem.ser12.pll_time;
1da177e4
LT		 215 while (timediff >= 500000)
216 timediff -= 1000000;
217 while (timediff >= bdus2) {
218 timediff -= bc->baud_us;
219 bc->modem.ser12.pll_time += bc->baud_us;
220 bc->modem.ser12.dcd_time--;
221 /* first check if there is room to add a bit */
222 if (bc->modem.shreg & 1) {
223 hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
224 bc->modem.shreg = 0x10000;
225 }
226 /* add a one bit */
227 bc->modem.shreg >>= 1;
228 }
229 if (bc->modem.ser12.dcd_time <= 0) {
230 if (!bc->opt_dcd)
231 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
232 bc->modem.ser12.dcd_sum1 +
233 bc->modem.ser12.dcd_sum2) < 0);
234 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
235 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
236 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
237 bc->modem.ser12.dcd_time += 120;
238 }
239 if (bc->modem.ser12.last_rxbit != curs) {
240 bc->modem.ser12.last_rxbit = curs;
241 bc->modem.shreg |= 0x10000;
242 /* adjust the PLL */
243 if (timediff > 0)
244 bc->modem.ser12.pll_time += bdus8;
245 else
246 bc->modem.ser12.pll_time += 1000000 - bdus8;
247 /* update DCD */
248 if (abs(timediff) > bdus4)
249 bc->modem.ser12.dcd_sum0 += 4;
250 else
251 bc->modem.ser12.dcd_sum0--;
252#ifdef BAYCOM_DEBUG
253 bc->debug_vals.cur_pllcorr = timediff;
254#endif /* BAYCOM_DEBUG */
255 }
256 while (bc->modem.ser12.pll_time >= 1000000)
257 bc->modem.ser12.pll_time -= 1000000;
258}
259
260/* --------------------------------------------------------------------- */
261
7d12e780 262static irqreturn_t ser12_interrupt(int irq, void *dev_id)
1da177e4
LT		 263{
264 struct net_device *dev = (struct net_device *)dev_id;
265 struct baycom_state *bc = netdev_priv(dev);
e6515203 266 struct timespec64 ts;
1da177e4
LT		 267 unsigned char iir, msr;
268 unsigned int txcount = 0;
269
270 if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
271 return IRQ_NONE;
272 /* fast way out for shared irq */
273 if ((iir = inb(IIR(dev->base_addr))) & 1)
274 return IRQ_NONE;
275 /* get current time */
e6515203 276 ktime_get_ts64(&ts);
1da177e4
LT		 277 msr = inb(MSR(dev->base_addr));
278 /* delta DCD */
279 if ((msr & 8) && bc->opt_dcd)
280 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
281 do {
282 switch (iir & 6) {
283 case 6:
284 inb(LSR(dev->base_addr));
285 break;
286
287 case 4:
288 inb(RBR(dev->base_addr));
289 break;
290
291 case 2:
292 /*
293 * make sure the next interrupt is generated;
294 * 0 must be used to power the modem; the modem draws its
295 * power from the TxD line
296 */
297 outb(0x00, THR(dev->base_addr));
298 baycom_int_freq(bc);
299 txcount++;
300 /*
301 * first output the last bit (!) then call HDLC transmitter,
302 * since this may take quite long
303 */
304 if (bc->modem.ptt)
305 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
306 else
307 outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
308 break;
309
310 default:
311 msr = inb(MSR(dev->base_addr));
312 /* delta DCD */
313 if ((msr & 8) && bc->opt_dcd)
314 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
315 break;
316 }
317 iir = inb(IIR(dev->base_addr));
318 } while (!(iir & 1));
e6515203 319 ser12_rx(dev, bc, &ts, msr & 0x10); /* CTS */
1da177e4
LT		 320 if (bc->modem.ptt && txcount) {
321 if (bc->modem.ser12.txshreg <= 1) {
322 bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
323 if (!hdlcdrv_ptt(&bc->hdrv)) {
324 ser12_set_divisor(dev, 115200/100/8);
325 bc->modem.ptt = 0;
326 goto end_transmit;
327 }
328 }
329 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
330 bc->modem.ser12.txshreg >>= 1;
331 }
332 end_transmit:
333 local_irq_enable();
334 if (!bc->modem.ptt && txcount) {
335 hdlcdrv_arbitrate(dev, &bc->hdrv);
336 if (hdlcdrv_ptt(&bc->hdrv)) {
337 ser12_set_divisor(dev, bc->baud_uartdiv);
338 bc->modem.ser12.txshreg = 1;
339 bc->modem.ptt = 1;
340 }
341 }
342 hdlcdrv_transmitter(dev, &bc->hdrv);
343 hdlcdrv_receiver(dev, &bc->hdrv);
344 local_irq_disable();
345 return IRQ_HANDLED;
346}
347
348/* --------------------------------------------------------------------- */
349
350enum uart { c_uart_unknown, c_uart_8250,
351 c_uart_16450, c_uart_16550, c_uart_16550A};
352static const char *uart_str[] = {
353 "unknown", "8250", "16450", "16550", "16550A"
354};
355
356static enum uart ser12_check_uart(unsigned int iobase)
357{
358 unsigned char b1,b2,b3;
359 enum uart u;
360 enum uart uart_tab[] =
361 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
362
363 b1 = inb(MCR(iobase));
364 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
365 b2 = inb(MSR(iobase));
366 outb(0x1a, MCR(iobase));
367 b3 = inb(MSR(iobase)) & 0xf0;
368 outb(b1, MCR(iobase)); /* restore old values */
369 outb(b2, MSR(iobase));
370 if (b3 != 0x90)
371 return c_uart_unknown;
372 inb(RBR(iobase));
373 inb(RBR(iobase));
374 outb(0x01, FCR(iobase)); /* enable FIFOs */
375 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
376 if (u == c_uart_16450) {
377 outb(0x5a, SCR(iobase));
378 b1 = inb(SCR(iobase));
379 outb(0xa5, SCR(iobase));
380 b2 = inb(SCR(iobase));
381 if ((b1 != 0x5a) || (b2 != 0xa5))
382 u = c_uart_8250;
383 }
384 return u;
385}
386
387/* --------------------------------------------------------------------- */
388
389static int ser12_open(struct net_device *dev)
390{
391 struct baycom_state *bc = netdev_priv(dev);
392 enum uart u;
393
394 if (!dev || !bc)
395 return -ENXIO;
939456ac 396 if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
60e4ad7a 397 dev->irq < 2 || dev->irq > nr_irqs) {
939456ac
FH		 398 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
399 "or irq (2 <= irq <= %d)\n",
60e4ad7a 400 0xffff-SER12_EXTENT, nr_irqs);
1da177e4 401 return -ENXIO;
939456ac
FH		 402 }
403 if (bc->baud < 300 || bc->baud > 4800) {
404 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
405 "(300...4800)\n");
1da177e4 406 return -EINVAL;
939456ac 407 }
1da177e4 408 if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
2381a55c 409 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy\n",
1da177e4
LT		 410 dev->base_addr);
411 return -EACCES;
412 }
413 memset(&bc->modem, 0, sizeof(bc->modem));
414 bc->hdrv.par.bitrate = bc->baud;
415 bc->baud_us = 1000000/bc->baud;
416 bc->baud_uartdiv = (115200/8)/bc->baud;
417 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
418 release_region(dev->base_addr, SER12_EXTENT);
419 return -EIO;
420 }
421 outb(0, FCR(dev->base_addr)); /* disable FIFOs */
422 outb(0x0d, MCR(dev->base_addr));
423 outb(0, IER(dev->base_addr));
44a504c7 424 if (request_irq(dev->irq, ser12_interrupt, IRQF_SHARED,
1da177e4
LT		 425 "baycom_ser_fdx", dev)) {
426 release_region(dev->base_addr, SER12_EXTENT);
427 return -EBUSY;
428 }
429 /*
430 * set the SIO to 6 Bits/character; during receive,
431 * the baud rate is set to produce 100 ints/sec
432 * to feed the channel arbitration process,
433 * during transmit to baud ints/sec to run
434 * the transmitter
435 */
436 ser12_set_divisor(dev, 115200/100/8);
437 /*
438 * enable transmitter empty interrupt and modem status interrupt
439 */
440 outb(0x0a, IER(dev->base_addr));
441 /*
442 * make sure the next interrupt is generated;
443 * 0 must be used to power the modem; the modem draws its
444 * power from the TxD line
445 */
446 outb(0x00, THR(dev->base_addr));
447 hdlcdrv_setdcd(&bc->hdrv, 0);
448 printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
449 bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
450 return 0;
451}
452
453/* --------------------------------------------------------------------- */
454
455static int ser12_close(struct net_device *dev)
456{
457 struct baycom_state *bc = netdev_priv(dev);
458
459 if (!dev || !bc)
460 return -EINVAL;
461 /*
462 * disable interrupts
463 */
464 outb(0, IER(dev->base_addr));
465 outb(1, MCR(dev->base_addr));
466 free_irq(dev->irq, dev);
467 release_region(dev->base_addr, SER12_EXTENT);
468 printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
469 bc_drvname, dev->base_addr, dev->irq);
470 return 0;
471}
472
473/* --------------------------------------------------------------------- */
474/*
475 * ===================== hdlcdrv driver interface =========================
476 */
477
478/* --------------------------------------------------------------------- */
479
480static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
481 struct hdlcdrv_ioctl *hi, int cmd);
482
483/* --------------------------------------------------------------------- */
484
511aeaf4 485static const struct hdlcdrv_ops ser12_ops = {
1da177e4
LT		 486 .drvname = bc_drvname,
487 .drvinfo = bc_drvinfo,
488 .open = ser12_open,
489 .close = ser12_close,
490 .ioctl = baycom_ioctl,
491};
492
493/* --------------------------------------------------------------------- */
494
495static int baycom_setmode(struct baycom_state *bc, const char *modestr)
496{
497 unsigned int baud;
498
499 if (!strncmp(modestr, "ser", 3)) {
500 baud = simple_strtoul(modestr+3, NULL, 10);
501 if (baud >= 3 && baud <= 48)
502 bc->baud = baud*100;
503 }
504 if (strchr(modestr, '*'))
505 bc->opt_dcd = 0;
506 else if (strchr(modestr, '+'))
507 bc->opt_dcd = -1;
508 else
509 bc->opt_dcd = 1;
510 return 0;
511}
512
513/* --------------------------------------------------------------------- */
514
515static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
516 struct hdlcdrv_ioctl *hi, int cmd)
517{
518 struct baycom_state *bc;
519 struct baycom_ioctl bi;
520
521 if (!dev)
522 return -EINVAL;
523
524 bc = netdev_priv(dev);
525 BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
526
527 if (cmd != SIOCDEVPRIVATE)
528 return -ENOIOCTLCMD;
529 switch (hi->cmd) {
530 default:
531 break;
532
533 case HDLCDRVCTL_GETMODE:
534 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
535 if (bc->opt_dcd <= 0)
536 strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
537 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
538 return -EFAULT;
539 return 0;
540
541 case HDLCDRVCTL_SETMODE:
542 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
543 return -EACCES;
544 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
545 return baycom_setmode(bc, hi->data.modename);
546
547 case HDLCDRVCTL_MODELIST:
548 strcpy(hi->data.modename, "ser12,ser3,ser24");
549 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
550 return -EFAULT;
551 return 0;
552
553 case HDLCDRVCTL_MODEMPARMASK:
554 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
555
556 }
557
558 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
559 return -EFAULT;
560 switch (bi.cmd) {
561 default:
562 return -ENOIOCTLCMD;
563
564#ifdef BAYCOM_DEBUG
565 case BAYCOMCTL_GETDEBUG:
566 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
567 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
568 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
569 break;
570#endif /* BAYCOM_DEBUG */
571
572 }
573 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
574 return -EFAULT;
575 return 0;
576
577}
578
579/* --------------------------------------------------------------------- */
580
581/*
582 * command line settable parameters
583 */
584static char *mode[NR_PORTS] = { "ser12*", };
585static int iobase[NR_PORTS] = { 0x3f8, };
586static int irq[NR_PORTS] = { 4, };
587static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
588
589module_param_array(mode, charp, NULL, 0);
590MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
b658e5d8 591module_param_hw_array(iobase, int, ioport, NULL, 0);
1da177e4 592MODULE_PARM_DESC(iobase, "baycom io base address");
b658e5d8 593module_param_hw_array(irq, int, irq, NULL, 0);
1da177e4
LT		 594MODULE_PARM_DESC(irq, "baycom irq number");
595module_param_array(baud, int, NULL, 0);
596MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
597
598MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
599MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
600MODULE_LICENSE("GPL");
601
602/* --------------------------------------------------------------------- */
603
604static int __init init_baycomserfdx(void)
605{
606 int i, found = 0;
607 char set_hw = 1;
608
609 printk(bc_drvinfo);
610 /*
611 * register net devices
612 */
613 for (i = 0; i < NR_PORTS; i++) {
614 struct net_device *dev;
615 struct baycom_state *bc;
616 char ifname[IFNAMSIZ];
617
618 sprintf(ifname, "bcsf%d", i);
619
620 if (!mode[i])
621 set_hw = 0;
622 if (!set_hw)
623 iobase[i] = irq[i] = 0;
624
625 dev = hdlcdrv_register(&ser12_ops,
626 sizeof(struct baycom_state),
627 ifname, iobase[i], irq[i], 0);
628 if (IS_ERR(dev))
629 break;
630
631 bc = netdev_priv(dev);
632 if (set_hw && baycom_setmode(bc, mode[i]))
633 set_hw = 0;
634 bc->baud = baud[i];
635 found++;
636 baycom_device[i] = dev;
637 }
638
639 if (!found)
640 return -ENXIO;
641 return 0;
642}
643
644static void __exit cleanup_baycomserfdx(void)
645{
646 int i;
647
648 for(i = 0; i < NR_PORTS; i++) {
649 struct net_device *dev = baycom_device[i];
650 if (dev)
651 hdlcdrv_unregister(dev);
652 }
653}
654
655module_init(init_baycomserfdx);
656module_exit(cleanup_baycomserfdx);
657
658/* --------------------------------------------------------------------- */
659
660#ifndef MODULE
661
662/*
663 * format: baycom_ser_fdx=io,irq,mode
664 * mode: ser# hardware DCD
665 * ser#* software DCD
666 * ser#+ hardware DCD, inverted signal at DCD pin
667 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
668 */
669
670static int __init baycom_ser_fdx_setup(char *str)
671{
672 static unsigned nr_dev;
673 int ints[4];
674
675 if (nr_dev >= NR_PORTS)
676 return 0;
677 str = get_options(str, 4, ints);
678 if (ints[0] < 2)
679 return 0;
680 mode[nr_dev] = str;
681 iobase[nr_dev] = ints[1];
682 irq[nr_dev] = ints[2];
683 if (ints[0] >= 3)
684 baud[nr_dev] = ints[3];
685 nr_dev++;
686 return 1;
687}
688
689__setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
690
691#endif /* MODULE */
692/* --------------------------------------------------------------------- */
Linux 6.x block layer and io_uring tree(s)