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
80 static const char bc_drvname[] = "baycom_ser_fdx";
81 static 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
88 static 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
112 struct 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
baycom_int_freq(struct baycom_state * bc)145 static 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
ser12_set_divisor(struct net_device * dev,unsigned int divisor)170 static 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
ser12_rx(struct net_device * dev,struct baycom_state * bc,struct timespec64 * ts,unsigned char curs)191 static __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
ser12_interrupt(int irq,void * dev_id)247 static 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
335 enum uart { c_uart_unknown, c_uart_8250,
336 c_uart_16450, c_uart_16550, c_uart_16550A};
337 static const char *uart_str[] = {
338 "unknown", "8250", "16450", "16550", "16550A"
339 };
340
ser12_check_uart(unsigned int iobase)341 static 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
ser12_open(struct net_device * dev)374 static 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
ser12_close(struct net_device * dev)440 static 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
465 static int baycom_ioctl(struct net_device *dev, void __user *data,
466 struct hdlcdrv_ioctl *hi, int cmd);
467
468 /* --------------------------------------------------------------------- */
469
470 static 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
baycom_setmode(struct baycom_state * bc,const char * modestr)480 static 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
baycom_ioctl(struct net_device * dev,void __user * data,struct hdlcdrv_ioctl * hi,int cmd)500 static 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 */
569 static char *mode[NR_PORTS] = { "ser12*", };
570 static int iobase[NR_PORTS] = { 0x3f8, };
571 static int irq[NR_PORTS] = { 4, };
572 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
573
574 module_param_array(mode, charp, NULL, 0);
575 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
576 module_param_hw_array(iobase, int, ioport, NULL, 0);
577 MODULE_PARM_DESC(iobase, "baycom io base address");
578 module_param_hw_array(irq, int, irq, NULL, 0);
579 MODULE_PARM_DESC(irq, "baycom irq number");
580 module_param_array(baud, int, NULL, 0);
581 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
582
583 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
584 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
585 MODULE_LICENSE("GPL");
586
587 /* --------------------------------------------------------------------- */
588
init_baycomserfdx(void)589 static 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
cleanup_baycomserfdx(void)629 static 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
640 module_init(init_baycomserfdx);
641 module_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
baycom_ser_fdx_setup(char * str)655 static 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 /* --------------------------------------------------------------------- */
678