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OMAP3 PM: CPUFreq driver for OMAP3
[linux-ginger.git] / drivers / net / hamradio / baycom_ser_fdx.c
blobed60fd664273e4a089c3e39c2c4c7a91d1022803
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 contignuous stream of 0x00-bytes
39 * is transmitted to achieve a positive supply voltage.
40 *
41 * hsk: This is a 4800 baud FSK modem, designed for TNC use. It works fine
42 * in 'baycom-mode' :-) In contrast to the TCM3105 modem, power is
43 * externally supplied. So there's no need to provide the 0x00-byte-stream
44 * when receiving or idle, which drastically reduces interrupt load.
45 *
46 * Command line options (insmod command line)
47 *
48 * mode ser# hardware DCD
49 * ser#* software DCD
50 * ser#+ hardware DCD, inverted signal at DCD pin
51 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
52 * iobase base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
53 * baud baud rate (between 300 and 4800)
54 * irq interrupt line of the port; common values are 4,3
55 *
56 *
57 * History:
58 * 0.1 26.06.1996 Adapted from baycom.c and made network driver interface
59 * 18.10.1996 Changed to new user space access routines (copy_{to,from}_user)
60 * 0.3 26.04.1997 init code/data tagged
61 * 0.4 08.07.1997 alternative ser12 decoding algorithm (uses delta CTS ints)
62 * 0.5 11.11.1997 ser12/par96 split into separate files
63 * 0.6 24.01.1998 Thorsten Kranzkowski, dl8bcu and Thomas Sailer:
64 * reduced interrupt load in transmit case
65 * reworked receiver
66 * 0.7 03.08.1999 adapt to Linus' new __setup/__initcall
67 * 0.8 10.08.1999 use module_init/module_exit
68 * 0.9 12.02.2000 adapted to softnet driver interface
69 * 0.10 03.07.2000 fix interface name handling
70 */
71
72 /*****************************************************************************/
73
74 #include <linux/capability.h>
75 #include <linux/module.h>
76 #include <linux/ioport.h>
77 #include <linux/string.h>
78 #include <linux/init.h>
79 #include <linux/hdlcdrv.h>
80 #include <linux/baycom.h>
81 #include <linux/jiffies.h>
82
83 #include <asm/uaccess.h>
84 #include <asm/io.h>
85 #include <asm/irq.h>
86
87 /* --------------------------------------------------------------------- */
88
89 #define BAYCOM_DEBUG
90
91 /* --------------------------------------------------------------------- */
92
93 static const char bc_drvname[] = "baycom_ser_fdx";
94 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_fdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
95 "baycom_ser_fdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
96
97 /* --------------------------------------------------------------------- */
98
99 #define NR_PORTS 4
100
101 static struct net_device *baycom_device[NR_PORTS];
102
103 /* --------------------------------------------------------------------- */
104
105 #define RBR(iobase) (iobase+0)
106 #define THR(iobase) (iobase+0)
107 #define IER(iobase) (iobase+1)
108 #define IIR(iobase) (iobase+2)
109 #define FCR(iobase) (iobase+2)
110 #define LCR(iobase) (iobase+3)
111 #define MCR(iobase) (iobase+4)
112 #define LSR(iobase) (iobase+5)
113 #define MSR(iobase) (iobase+6)
114 #define SCR(iobase) (iobase+7)
115 #define DLL(iobase) (iobase+0)
116 #define DLM(iobase) (iobase+1)
117
118 #define SER12_EXTENT 8
119
120 /* ---------------------------------------------------------------------- */
121 /*
122 * Information that need to be kept for each board.
123 */
124
125 struct baycom_state {
126 struct hdlcdrv_state hdrv;
127
128 unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout;
129 int opt_dcd;
130
131 struct modem_state {
132 unsigned char flags;
133 unsigned char ptt;
134 unsigned int shreg;
135 struct modem_state_ser12 {
136 unsigned char tx_bit;
137 unsigned char last_rxbit;
138 int dcd_sum0, dcd_sum1, dcd_sum2;
139 int dcd_time;
140 unsigned int pll_time;
141 unsigned int txshreg;
142 } ser12;
143 } modem;
144
145 #ifdef BAYCOM_DEBUG
146 struct debug_vals {
147 unsigned long last_jiffies;
148 unsigned cur_intcnt;
149 unsigned last_intcnt;
150 int cur_pllcorr;
151 int last_pllcorr;
152 } debug_vals;
153 #endif /* BAYCOM_DEBUG */
154 };
155
156 /* --------------------------------------------------------------------- */
157
158 static inline void baycom_int_freq(struct baycom_state *bc)
159 {
160 #ifdef BAYCOM_DEBUG
161 unsigned long cur_jiffies = jiffies;
162 /*
163 * measure the interrupt frequency
164 */
165 bc->debug_vals.cur_intcnt++;
166 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
167 bc->debug_vals.last_jiffies = cur_jiffies;
168 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
169 bc->debug_vals.cur_intcnt = 0;
170 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
171 bc->debug_vals.cur_pllcorr = 0;
172 }
173 #endif /* BAYCOM_DEBUG */
174 }
175
176 /* --------------------------------------------------------------------- */
177 /*
178 * ===================== SER12 specific routines =========================
179 */
180
181 /* --------------------------------------------------------------------- */
182
183 static inline void ser12_set_divisor(struct net_device *dev,
184 unsigned int divisor)
185 {
186 outb(0x81, LCR(dev->base_addr)); /* DLAB = 1 */
187 outb(divisor, DLL(dev->base_addr));
188 outb(divisor >> 8, DLM(dev->base_addr));
189 outb(0x01, LCR(dev->base_addr)); /* word length = 6 */
190 /*
191 * make sure the next interrupt is generated;
192 * 0 must be used to power the modem; the modem draws its
193 * power from the TxD line
194 */
195 outb(0x00, THR(dev->base_addr));
196 /*
197 * it is important not to set the divider while transmitting;
198 * this reportedly makes some UARTs generating interrupts
199 * in the hundredthousands per second region
200 * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
201 */
202 }
203
204 /* --------------------------------------------------------------------- */
205
206 #if 0
207 static inline unsigned int hweight16(unsigned int w)
208 __attribute__ ((unused));
209 static inline unsigned int hweight8(unsigned int w)
210 __attribute__ ((unused));
211
212 static inline unsigned int hweight16(unsigned int w)
213 {
214 unsigned short res = (w & 0x5555) + ((w >> 1) & 0x5555);
215 res = (res & 0x3333) + ((res >> 2) & 0x3333);
216 res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
217 return (res & 0x00FF) + ((res >> 8) & 0x00FF);
218 }
219
220 static inline unsigned int hweight8(unsigned int w)
221 {
222 unsigned short res = (w & 0x55) + ((w >> 1) & 0x55);
223 res = (res & 0x33) + ((res >> 2) & 0x33);
224 return (res & 0x0F) + ((res >> 4) & 0x0F);
225 }
226 #endif
227
228 /* --------------------------------------------------------------------- */
229
230 static __inline__ void ser12_rx(struct net_device *dev, struct baycom_state *bc, struct timeval *tv, unsigned char curs)
231 {
232 int timediff;
233 int bdus8 = bc->baud_us >> 3;
234 int bdus4 = bc->baud_us >> 2;
235 int bdus2 = bc->baud_us >> 1;
236
237 timediff = 1000000 + tv->tv_usec - bc->modem.ser12.pll_time;
238 while (timediff >= 500000)
239 timediff -= 1000000;
240 while (timediff >= bdus2) {
241 timediff -= bc->baud_us;
242 bc->modem.ser12.pll_time += bc->baud_us;
243 bc->modem.ser12.dcd_time--;
244 /* first check if there is room to add a bit */
245 if (bc->modem.shreg & 1) {
246 hdlcdrv_putbits(&bc->hdrv, (bc->modem.shreg >> 1) ^ 0xffff);
247 bc->modem.shreg = 0x10000;
248 }
249 /* add a one bit */
250 bc->modem.shreg >>= 1;
251 }
252 if (bc->modem.ser12.dcd_time <= 0) {
253 if (!bc->opt_dcd)
254 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
255 bc->modem.ser12.dcd_sum1 +
256 bc->modem.ser12.dcd_sum2) < 0);
257 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
258 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
259 bc->modem.ser12.dcd_sum0 = 2; /* slight bias */
260 bc->modem.ser12.dcd_time += 120;
261 }
262 if (bc->modem.ser12.last_rxbit != curs) {
263 bc->modem.ser12.last_rxbit = curs;
264 bc->modem.shreg |= 0x10000;
265 /* adjust the PLL */
266 if (timediff > 0)
267 bc->modem.ser12.pll_time += bdus8;
268 else
269 bc->modem.ser12.pll_time += 1000000 - bdus8;
270 /* update DCD */
271 if (abs(timediff) > bdus4)
272 bc->modem.ser12.dcd_sum0 += 4;
273 else
274 bc->modem.ser12.dcd_sum0--;
275 #ifdef BAYCOM_DEBUG
276 bc->debug_vals.cur_pllcorr = timediff;
277 #endif /* BAYCOM_DEBUG */
278 }
279 while (bc->modem.ser12.pll_time >= 1000000)
280 bc->modem.ser12.pll_time -= 1000000;
281 }
282
283 /* --------------------------------------------------------------------- */
284
285 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
286 {
287 struct net_device *dev = (struct net_device *)dev_id;
288 struct baycom_state *bc = netdev_priv(dev);
289 struct timeval tv;
290 unsigned char iir, msr;
291 unsigned int txcount = 0;
292
293 if (!bc || bc->hdrv.magic != HDLCDRV_MAGIC)
294 return IRQ_NONE;
295 /* fast way out for shared irq */
296 if ((iir = inb(IIR(dev->base_addr))) & 1)
297 return IRQ_NONE;
298 /* get current time */
299 do_gettimeofday(&tv);
300 msr = inb(MSR(dev->base_addr));
301 /* delta DCD */
302 if ((msr & 8) && bc->opt_dcd)
303 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
304 do {
305 switch (iir & 6) {
306 case 6:
307 inb(LSR(dev->base_addr));
308 break;
309
310 case 4:
311 inb(RBR(dev->base_addr));
312 break;
313
314 case 2:
315 /*
316 * make sure the next interrupt is generated;
317 * 0 must be used to power the modem; the modem draws its
318 * power from the TxD line
319 */
320 outb(0x00, THR(dev->base_addr));
321 baycom_int_freq(bc);
322 txcount++;
323 /*
324 * first output the last bit (!) then call HDLC transmitter,
325 * since this may take quite long
326 */
327 if (bc->modem.ptt)
328 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
329 else
330 outb(0x0d, MCR(dev->base_addr)); /* transmitter off */
331 break;
332
333 default:
334 msr = inb(MSR(dev->base_addr));
335 /* delta DCD */
336 if ((msr & 8) && bc->opt_dcd)
337 hdlcdrv_setdcd(&bc->hdrv, !((msr ^ bc->opt_dcd) & 0x80));
338 break;
339 }
340 iir = inb(IIR(dev->base_addr));
341 } while (!(iir & 1));
342 ser12_rx(dev, bc, &tv, msr & 0x10); /* CTS */
343 if (bc->modem.ptt && txcount) {
344 if (bc->modem.ser12.txshreg <= 1) {
345 bc->modem.ser12.txshreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
346 if (!hdlcdrv_ptt(&bc->hdrv)) {
347 ser12_set_divisor(dev, 115200/100/8);
348 bc->modem.ptt = 0;
349 goto end_transmit;
350 }
351 }
352 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^ (bc->modem.ser12.txshreg & 1));
353 bc->modem.ser12.txshreg >>= 1;
354 }
355 end_transmit:
356 local_irq_enable();
357 if (!bc->modem.ptt && txcount) {
358 hdlcdrv_arbitrate(dev, &bc->hdrv);
359 if (hdlcdrv_ptt(&bc->hdrv)) {
360 ser12_set_divisor(dev, bc->baud_uartdiv);
361 bc->modem.ser12.txshreg = 1;
362 bc->modem.ptt = 1;
363 }
364 }
365 hdlcdrv_transmitter(dev, &bc->hdrv);
366 hdlcdrv_receiver(dev, &bc->hdrv);
367 local_irq_disable();
368 return IRQ_HANDLED;
369 }
370
371 /* --------------------------------------------------------------------- */
372
373 enum uart { c_uart_unknown, c_uart_8250,
374 c_uart_16450, c_uart_16550, c_uart_16550A};
375 static const char *uart_str[] = {
376 "unknown", "8250", "16450", "16550", "16550A"
377 };
378
379 static enum uart ser12_check_uart(unsigned int iobase)
380 {
381 unsigned char b1,b2,b3;
382 enum uart u;
383 enum uart uart_tab[] =
384 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
385
386 b1 = inb(MCR(iobase));
387 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
388 b2 = inb(MSR(iobase));
389 outb(0x1a, MCR(iobase));
390 b3 = inb(MSR(iobase)) & 0xf0;
391 outb(b1, MCR(iobase)); /* restore old values */
392 outb(b2, MSR(iobase));
393 if (b3 != 0x90)
394 return c_uart_unknown;
395 inb(RBR(iobase));
396 inb(RBR(iobase));
397 outb(0x01, FCR(iobase)); /* enable FIFOs */
398 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
399 if (u == c_uart_16450) {
400 outb(0x5a, SCR(iobase));
401 b1 = inb(SCR(iobase));
402 outb(0xa5, SCR(iobase));
403 b2 = inb(SCR(iobase));
404 if ((b1 != 0x5a) || (b2 != 0xa5))
405 u = c_uart_8250;
406 }
407 return u;
408 }
409
410 /* --------------------------------------------------------------------- */
411
412 static int ser12_open(struct net_device *dev)
413 {
414 struct baycom_state *bc = netdev_priv(dev);
415 enum uart u;
416
417 if (!dev || !bc)
418 return -ENXIO;
419 if (!dev->base_addr || dev->base_addr > 0xffff-SER12_EXTENT ||
420 dev->irq < 2 || dev->irq > nr_irqs) {
421 printk(KERN_INFO "baycom_ser_fdx: invalid portnumber (max %u) "
422 "or irq (2 <= irq <= %d)\n",
423 0xffff-SER12_EXTENT, nr_irqs);
424 return -ENXIO;
425 }
426 if (bc->baud < 300 || bc->baud > 4800) {
427 printk(KERN_INFO "baycom_ser_fdx: invalid baudrate "
428 "(300...4800)\n");
429 return -EINVAL;
430 }
431 if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser_fdx")) {
432 printk(KERN_WARNING "BAYCOM_SER_FSX: I/O port 0x%04lx busy \n",
433 dev->base_addr);
434 return -EACCES;
435 }
436 memset(&bc->modem, 0, sizeof(bc->modem));
437 bc->hdrv.par.bitrate = bc->baud;
438 bc->baud_us = 1000000/bc->baud;
439 bc->baud_uartdiv = (115200/8)/bc->baud;
440 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown){
441 release_region(dev->base_addr, SER12_EXTENT);
442 return -EIO;
443 }
444 outb(0, FCR(dev->base_addr)); /* disable FIFOs */
445 outb(0x0d, MCR(dev->base_addr));
446 outb(0, IER(dev->base_addr));
447 if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
448 "baycom_ser_fdx", dev)) {
449 release_region(dev->base_addr, SER12_EXTENT);
450 return -EBUSY;
451 }
452 /*
453 * set the SIO to 6 Bits/character; during receive,
454 * the baud rate is set to produce 100 ints/sec
455 * to feed the channel arbitration process,
456 * during transmit to baud ints/sec to run
457 * the transmitter
458 */
459 ser12_set_divisor(dev, 115200/100/8);
460 /*
461 * enable transmitter empty interrupt and modem status interrupt
462 */
463 outb(0x0a, IER(dev->base_addr));
464 /*
465 * make sure the next interrupt is generated;
466 * 0 must be used to power the modem; the modem draws its
467 * power from the TxD line
468 */
469 outb(0x00, THR(dev->base_addr));
470 hdlcdrv_setdcd(&bc->hdrv, 0);
471 printk(KERN_INFO "%s: ser_fdx at iobase 0x%lx irq %u baud %u uart %s\n",
472 bc_drvname, dev->base_addr, dev->irq, bc->baud, uart_str[u]);
473 return 0;
474 }
475
476 /* --------------------------------------------------------------------- */
477
478 static int ser12_close(struct net_device *dev)
479 {
480 struct baycom_state *bc = netdev_priv(dev);
481
482 if (!dev || !bc)
483 return -EINVAL;
484 /*
485 * disable interrupts
486 */
487 outb(0, IER(dev->base_addr));
488 outb(1, MCR(dev->base_addr));
489 free_irq(dev->irq, dev);
490 release_region(dev->base_addr, SER12_EXTENT);
491 printk(KERN_INFO "%s: close ser_fdx at iobase 0x%lx irq %u\n",
492 bc_drvname, dev->base_addr, dev->irq);
493 return 0;
494 }
495
496 /* --------------------------------------------------------------------- */
497 /*
498 * ===================== hdlcdrv driver interface =========================
499 */
500
501 /* --------------------------------------------------------------------- */
502
503 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
504 struct hdlcdrv_ioctl *hi, int cmd);
505
506 /* --------------------------------------------------------------------- */
507
508 static struct hdlcdrv_ops ser12_ops = {
509 .drvname = bc_drvname,
510 .drvinfo = bc_drvinfo,
511 .open = ser12_open,
512 .close = ser12_close,
513 .ioctl = baycom_ioctl,
514 };
515
516 /* --------------------------------------------------------------------- */
517
518 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
519 {
520 unsigned int baud;
521
522 if (!strncmp(modestr, "ser", 3)) {
523 baud = simple_strtoul(modestr+3, NULL, 10);
524 if (baud >= 3 && baud <= 48)
525 bc->baud = baud*100;
526 }
527 if (strchr(modestr, '*'))
528 bc->opt_dcd = 0;
529 else if (strchr(modestr, '+'))
530 bc->opt_dcd = -1;
531 else
532 bc->opt_dcd = 1;
533 return 0;
534 }
535
536 /* --------------------------------------------------------------------- */
537
538 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
539 struct hdlcdrv_ioctl *hi, int cmd)
540 {
541 struct baycom_state *bc;
542 struct baycom_ioctl bi;
543
544 if (!dev)
545 return -EINVAL;
546
547 bc = netdev_priv(dev);
548 BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
549
550 if (cmd != SIOCDEVPRIVATE)
551 return -ENOIOCTLCMD;
552 switch (hi->cmd) {
553 default:
554 break;
555
556 case HDLCDRVCTL_GETMODE:
557 sprintf(hi->data.modename, "ser%u", bc->baud / 100);
558 if (bc->opt_dcd <= 0)
559 strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : "+");
560 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
561 return -EFAULT;
562 return 0;
563
564 case HDLCDRVCTL_SETMODE:
565 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
566 return -EACCES;
567 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
568 return baycom_setmode(bc, hi->data.modename);
569
570 case HDLCDRVCTL_MODELIST:
571 strcpy(hi->data.modename, "ser12,ser3,ser24");
572 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
573 return -EFAULT;
574 return 0;
575
576 case HDLCDRVCTL_MODEMPARMASK:
577 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
578
579 }
580
581 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
582 return -EFAULT;
583 switch (bi.cmd) {
584 default:
585 return -ENOIOCTLCMD;
586
587 #ifdef BAYCOM_DEBUG
588 case BAYCOMCTL_GETDEBUG:
589 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
590 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
591 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
592 break;
593 #endif /* BAYCOM_DEBUG */
594
595 }
596 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
597 return -EFAULT;
598 return 0;
599
600 }
601
602 /* --------------------------------------------------------------------- */
603
604 /*
605 * command line settable parameters
606 */
607 static char *mode[NR_PORTS] = { "ser12*", };
608 static int iobase[NR_PORTS] = { 0x3f8, };
609 static int irq[NR_PORTS] = { 4, };
610 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
611
612 module_param_array(mode, charp, NULL, 0);
613 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
614 module_param_array(iobase, int, NULL, 0);
615 MODULE_PARM_DESC(iobase, "baycom io base address");
616 module_param_array(irq, int, NULL, 0);
617 MODULE_PARM_DESC(irq, "baycom irq number");
618 module_param_array(baud, int, NULL, 0);
619 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
620
621 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
622 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
623 MODULE_LICENSE("GPL");
624
625 /* --------------------------------------------------------------------- */
626
627 static int __init init_baycomserfdx(void)
628 {
629 int i, found = 0;
630 char set_hw = 1;
631
632 printk(bc_drvinfo);
633 /*
634 * register net devices
635 */
636 for (i = 0; i < NR_PORTS; i++) {
637 struct net_device *dev;
638 struct baycom_state *bc;
639 char ifname[IFNAMSIZ];
640
641 sprintf(ifname, "bcsf%d", i);
642
643 if (!mode[i])
644 set_hw = 0;
645 if (!set_hw)
646 iobase[i] = irq[i] = 0;
647
648 dev = hdlcdrv_register(&ser12_ops,
649 sizeof(struct baycom_state),
650 ifname, iobase[i], irq[i], 0);
651 if (IS_ERR(dev))
652 break;
653
654 bc = netdev_priv(dev);
655 if (set_hw && baycom_setmode(bc, mode[i]))
656 set_hw = 0;
657 bc->baud = baud[i];
658 found++;
659 baycom_device[i] = dev;
660 }
661
662 if (!found)
663 return -ENXIO;
664 return 0;
665 }
666
667 static void __exit cleanup_baycomserfdx(void)
668 {
669 int i;
670
671 for(i = 0; i < NR_PORTS; i++) {
672 struct net_device *dev = baycom_device[i];
673 if (dev)
674 hdlcdrv_unregister(dev);
675 }
676 }
677
678 module_init(init_baycomserfdx);
679 module_exit(cleanup_baycomserfdx);
680
681 /* --------------------------------------------------------------------- */
682
683 #ifndef MODULE
684
685 /*
686 * format: baycom_ser_fdx=io,irq,mode
687 * mode: ser# hardware DCD
688 * ser#* software DCD
689 * ser#+ hardware DCD, inverted signal at DCD pin
690 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
691 */
692
693 static int __init baycom_ser_fdx_setup(char *str)
694 {
695 static unsigned nr_dev;
696 int ints[4];
697
698 if (nr_dev >= NR_PORTS)
699 return 0;
700 str = get_options(str, 4, ints);
701 if (ints[0] < 2)
702 return 0;
703 mode[nr_dev] = str;
704 iobase[nr_dev] = ints[1];
705 irq[nr_dev] = ints[2];
706 if (ints[0] >= 3)
707 baud[nr_dev] = ints[3];
708 nr_dev++;
709 return 1;
710 }
711
712 __setup("baycom_ser_fdx=", baycom_ser_fdx_setup);
713
714 #endif /* MODULE */
715 /* --------------------------------------------------------------------- */
Linux for Ginger Game Console