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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / net / hamradio / baycom_ser_fdx.c
bloba974727dd9a2bb604746a20b3f4e65d22b9801db
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
94 static const char bc_drvname[] = "baycom_ser_fdx";
95 static 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
102 static 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
126 struct 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
159 static 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
184 static 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
208 static inline unsigned int hweight16(unsigned int w)
209 __attribute__ ((unused));
210 static inline unsigned int hweight8(unsigned int w)
211 __attribute__ ((unused));
212
213 static 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
221 static 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
231 static __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
286 static 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
374 enum uart { c_uart_unknown, c_uart_8250,
375 c_uart_16450, c_uart_16550, c_uart_16550A};
376 static const char *uart_str[] = {
377 "unknown", "8250", "16450", "16550", "16550A"
378 };
379
380 static 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
413 static 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
479 static 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
504 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
505 struct hdlcdrv_ioctl *hi, int cmd);
506
507 /* --------------------------------------------------------------------- */
508
509 static 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
519 static 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
539 static 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 */
608 static char *mode[NR_PORTS] = { "ser12*", };
609 static int iobase[NR_PORTS] = { 0x3f8, };
610 static int irq[NR_PORTS] = { 4, };
611 static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
612
613 module_param_array(mode, charp, NULL, 0);
614 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
615 module_param_array(iobase, int, NULL, 0);
616 MODULE_PARM_DESC(iobase, "baycom io base address");
617 module_param_array(irq, int, NULL, 0);
618 MODULE_PARM_DESC(irq, "baycom irq number");
619 module_param_array(baud, int, NULL, 0);
620 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
621
622 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
623 MODULE_DESCRIPTION("Baycom ser12 full duplex amateur radio modem driver");
624 MODULE_LICENSE("GPL");
625
626 /* --------------------------------------------------------------------- */
627
628 static 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
668 static 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
679 module_init(init_baycomserfdx);
680 module_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
694 static 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 /* --------------------------------------------------------------------- */
Linux Btrfs Development