Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / drivers / net / hamradio / baycom_ser_hdx.c
1 /*****************************************************************************/
2
3 /*
4  *      baycom_ser_hdx.c  -- baycom ser12 halfduplex 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  *
38  *  Command line options (insmod command line)
39  *
40  *  mode     ser12    hardware DCD
41  *           ser12*   software DCD
42  *           ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
43  *                    mutes audio input to the modem
44  *           ser12+   hardware DCD, inverted signal at DCD pin
45  *  iobase   base address of the port; common values are 0x3f8, 0x2f8, 0x3e8, 0x2e8
46  *  irq      interrupt line of the port; common values are 4,3
47  *
48  *
49  *  History:
50  *   0.1  26.06.1996  Adapted from baycom.c and made network driver interface
51  *        18.10.1996  Changed to new user space access routines (copy_{to,from}_user)
52  *   0.3  26.04.1997  init code/data tagged
53  *   0.4  08.07.1997  alternative ser12 decoding algorithm (uses delta CTS ints)
54  *   0.5  11.11.1997  ser12/par96 split into separate files
55  *   0.6  14.04.1998  cleanups
56  *   0.7  03.08.1999  adapt to Linus' new __setup/__initcall
57  *   0.8  10.08.1999  use module_init/module_exit
58  *   0.9  12.02.2000  adapted to softnet driver interface
59  *   0.10 03.07.2000  fix interface name handling
60  */
61
62 /*****************************************************************************/
63
64 #include <linux/capability.h>
65 #include <linux/module.h>
66 #include <linux/ioport.h>
67 #include <linux/string.h>
68 #include <linux/init.h>
69 #include <linux/interrupt.h>
70 #include <asm/uaccess.h>
71 #include <asm/io.h>
72 #include <linux/hdlcdrv.h>
73 #include <linux/baycom.h>
74 #include <linux/jiffies.h>
75
76 /* --------------------------------------------------------------------- */
77
78 #define BAYCOM_DEBUG
79
80 /* --------------------------------------------------------------------- */
81
82 static const char bc_drvname[] = "baycom_ser_hdx";
83 static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
84 "baycom_ser_hdx: version 0.10\n";
85
86 /* --------------------------------------------------------------------- */
87
88 #define NR_PORTS 4
89
90 static struct net_device *baycom_device[NR_PORTS];
91
92 /* --------------------------------------------------------------------- */
93
94 #define RBR(iobase) (iobase+0)
95 #define THR(iobase) (iobase+0)
96 #define IER(iobase) (iobase+1)
97 #define IIR(iobase) (iobase+2)
98 #define FCR(iobase) (iobase+2)
99 #define LCR(iobase) (iobase+3)
100 #define MCR(iobase) (iobase+4)
101 #define LSR(iobase) (iobase+5)
102 #define MSR(iobase) (iobase+6)
103 #define SCR(iobase) (iobase+7)
104 #define DLL(iobase) (iobase+0)
105 #define DLM(iobase) (iobase+1)
106
107 #define SER12_EXTENT 8
108
109 /* ---------------------------------------------------------------------- */
110 /*
111  * Information that need to be kept for each board.
112  */
113
114 struct baycom_state {
115         struct hdlcdrv_state hdrv;
116
117         int opt_dcd;
118
119         struct modem_state {
120                 short arb_divider;
121                 unsigned char flags;
122                 unsigned int shreg;
123                 struct modem_state_ser12 {
124                         unsigned char tx_bit;
125                         int dcd_sum0, dcd_sum1, dcd_sum2;
126                         unsigned char last_sample;
127                         unsigned char last_rxbit;
128                         unsigned int dcd_shreg;
129                         unsigned int dcd_time;
130                         unsigned int bit_pll;
131                         unsigned char interm_sample;
132                 } ser12;
133         } modem;
134
135 #ifdef BAYCOM_DEBUG
136         struct debug_vals {
137                 unsigned long last_jiffies;
138                 unsigned cur_intcnt;
139                 unsigned last_intcnt;
140                 int cur_pllcorr;
141                 int last_pllcorr;
142         } debug_vals;
143 #endif /* BAYCOM_DEBUG */
144 };
145
146 /* --------------------------------------------------------------------- */
147
148 static inline void baycom_int_freq(struct baycom_state *bc)
149 {
150 #ifdef BAYCOM_DEBUG
151         unsigned long cur_jiffies = jiffies;
152         /*
153          * measure the interrupt frequency
154          */
155         bc->debug_vals.cur_intcnt++;
156         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
157                 bc->debug_vals.last_jiffies = cur_jiffies;
158                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
159                 bc->debug_vals.cur_intcnt = 0;
160                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
161                 bc->debug_vals.cur_pllcorr = 0;
162         }
163 #endif /* BAYCOM_DEBUG */
164 }
165
166 /* --------------------------------------------------------------------- */
167 /*
168  * ===================== SER12 specific routines =========================
169  */
170
171 static inline void ser12_set_divisor(struct net_device *dev,
172                                      unsigned char divisor)
173 {
174         outb(0x81, LCR(dev->base_addr));        /* DLAB = 1 */
175         outb(divisor, DLL(dev->base_addr));
176         outb(0, DLM(dev->base_addr));
177         outb(0x01, LCR(dev->base_addr));        /* word length = 6 */
178         /*
179          * make sure the next interrupt is generated;
180          * 0 must be used to power the modem; the modem draws its
181          * power from the TxD line
182          */
183         outb(0x00, THR(dev->base_addr));
184         /*
185          * it is important not to set the divider while transmitting;
186          * this reportedly makes some UARTs generating interrupts
187          * in the hundredthousands per second region
188          * Reported by: Ignacio.Arenaza@studi.epfl.ch (Ignacio Arenaza Nuno)
189          */
190 }
191
192 /* --------------------------------------------------------------------- */
193
194 /*
195  * must call the TX arbitrator every 10ms
196  */
197 #define SER12_ARB_DIVIDER(bc)  (bc->opt_dcd ? 24 : 36)
198                                
199 #define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
200
201 static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
202 {
203         /* one interrupt per channel bit */
204         ser12_set_divisor(dev, 12);
205         /*
206          * first output the last bit (!) then call HDLC transmitter,
207          * since this may take quite long
208          */
209         outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
210         if (bc->modem.shreg <= 1)
211                 bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
212         bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
213                                    (bc->modem.shreg & 1));
214         bc->modem.shreg >>= 1;
215 }
216
217 /* --------------------------------------------------------------------- */
218
219 static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
220 {
221         unsigned char cur_s;
222         /*
223          * do demodulator
224          */
225         cur_s = inb(MSR(dev->base_addr)) & 0x10;        /* the CTS line */
226         hdlcdrv_channelbit(&bc->hdrv, cur_s);
227         bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
228                 (cur_s != bc->modem.ser12.last_sample);
229         bc->modem.ser12.last_sample = cur_s;
230         if(bc->modem.ser12.dcd_shreg & 1) {
231                 if (!bc->opt_dcd) {
232                         unsigned int dcdspos, dcdsneg;
233
234                         dcdspos = dcdsneg = 0;
235                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
236                         if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
237                                 dcdspos += 2;
238                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
239                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
240                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
241
242                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
243                 } else
244                         bc->modem.ser12.dcd_sum0--;
245         }
246         if(!bc->modem.ser12.dcd_time) {
247                 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
248                                            bc->modem.ser12.dcd_sum1 +
249                                            bc->modem.ser12.dcd_sum2) < 0);
250                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
251                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
252                 /* offset to ensure DCD off on silent input */
253                 bc->modem.ser12.dcd_sum0 = 2;
254                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
255         }
256         bc->modem.ser12.dcd_time--;
257         if (!bc->opt_dcd) {
258                 /*
259                  * PLL code for the improved software DCD algorithm
260                  */
261                 if (bc->modem.ser12.interm_sample) {
262                         /*
263                          * intermediate sample; set timing correction to normal
264                          */
265                         ser12_set_divisor(dev, 4);
266                 } else {
267                         /*
268                          * do PLL correction and call HDLC receiver
269                          */
270                         switch (bc->modem.ser12.dcd_shreg & 7) {
271                         case 1: /* transition too late */
272                                 ser12_set_divisor(dev, 5);
273 #ifdef BAYCOM_DEBUG
274                                 bc->debug_vals.cur_pllcorr++;
275 #endif /* BAYCOM_DEBUG */
276                                 break;
277                         case 4: /* transition too early */
278                                 ser12_set_divisor(dev, 3);
279 #ifdef BAYCOM_DEBUG
280                                 bc->debug_vals.cur_pllcorr--;
281 #endif /* BAYCOM_DEBUG */
282                                 break;
283                         default:
284                                 ser12_set_divisor(dev, 4);
285                                 break;
286                         }
287                         bc->modem.shreg >>= 1;
288                         if (bc->modem.ser12.last_sample ==
289                             bc->modem.ser12.last_rxbit)
290                                 bc->modem.shreg |= 0x10000;
291                         bc->modem.ser12.last_rxbit =
292                                 bc->modem.ser12.last_sample;
293                 }
294                 if (++bc->modem.ser12.interm_sample >= 3)
295                         bc->modem.ser12.interm_sample = 0;
296                 /*
297                  * DCD stuff
298                  */
299                 if (bc->modem.ser12.dcd_shreg & 1) {
300                         unsigned int dcdspos, dcdsneg;
301
302                         dcdspos = dcdsneg = 0;
303                         dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
304                         dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
305                                 << 1;
306                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
307                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
308                         dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
309
310                         bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
311                 }
312         } else {
313                 /*
314                  * PLL algorithm for the hardware squelch DCD algorithm
315                  */
316                 if (bc->modem.ser12.interm_sample) {
317                         /*
318                          * intermediate sample; set timing correction to normal
319                          */
320                         ser12_set_divisor(dev, 6);
321                 } else {
322                         /*
323                          * do PLL correction and call HDLC receiver
324                          */
325                         switch (bc->modem.ser12.dcd_shreg & 3) {
326                         case 1: /* transition too late */
327                                 ser12_set_divisor(dev, 7);
328 #ifdef BAYCOM_DEBUG
329                                 bc->debug_vals.cur_pllcorr++;
330 #endif /* BAYCOM_DEBUG */
331                                 break;
332                         case 2: /* transition too early */
333                                 ser12_set_divisor(dev, 5);
334 #ifdef BAYCOM_DEBUG
335                                 bc->debug_vals.cur_pllcorr--;
336 #endif /* BAYCOM_DEBUG */
337                                 break;
338                         default:
339                                 ser12_set_divisor(dev, 6);
340                                 break;
341                         }
342                         bc->modem.shreg >>= 1;
343                         if (bc->modem.ser12.last_sample ==
344                             bc->modem.ser12.last_rxbit)
345                                 bc->modem.shreg |= 0x10000;
346                         bc->modem.ser12.last_rxbit =
347                                 bc->modem.ser12.last_sample;
348                 }
349                 bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
350                 /*
351                  * DCD stuff
352                  */
353                 bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
354         }
355         outb(0x0d, MCR(dev->base_addr));                /* transmitter off */
356         if (bc->modem.shreg & 1) {
357                 hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
358                 bc->modem.shreg = 0x10000;
359         }
360         if(!bc->modem.ser12.dcd_time) {
361                 if (bc->opt_dcd & 1) 
362                         hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
363                 else
364                         hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
365                                                    bc->modem.ser12.dcd_sum1 +
366                                                    bc->modem.ser12.dcd_sum2) < 0);
367                 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
368                 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
369                 /* offset to ensure DCD off on silent input */
370                 bc->modem.ser12.dcd_sum0 = 2;
371                 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
372         }
373         bc->modem.ser12.dcd_time--;
374 }
375
376 /* --------------------------------------------------------------------- */
377
378 static irqreturn_t ser12_interrupt(int irq, void *dev_id)
379 {
380         struct net_device *dev = (struct net_device *)dev_id;
381         struct baycom_state *bc = netdev_priv(dev);
382         unsigned char iir;
383
384         if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
385                 return IRQ_NONE;
386         /* fast way out */
387         if ((iir = inb(IIR(dev->base_addr))) & 1)
388                 return IRQ_NONE;
389         baycom_int_freq(bc);
390         do {
391                 switch (iir & 6) {
392                 case 6:
393                         inb(LSR(dev->base_addr));
394                         break;
395                         
396                 case 4:
397                         inb(RBR(dev->base_addr));
398                         break;
399                         
400                 case 2:
401                         /*
402                          * check if transmitter active
403                          */
404                         if (hdlcdrv_ptt(&bc->hdrv))
405                                 ser12_tx(dev, bc);
406                         else {
407                                 ser12_rx(dev, bc);
408                                 bc->modem.arb_divider--;
409                         }
410                         outb(0x00, THR(dev->base_addr));
411                         break;
412                         
413                 default:
414                         inb(MSR(dev->base_addr));
415                         break;
416                 }
417                 iir = inb(IIR(dev->base_addr));
418         } while (!(iir & 1));
419         if (bc->modem.arb_divider <= 0) {
420                 bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
421                 local_irq_enable();
422                 hdlcdrv_arbitrate(dev, &bc->hdrv);
423         }
424         local_irq_enable();
425         hdlcdrv_transmitter(dev, &bc->hdrv);
426         hdlcdrv_receiver(dev, &bc->hdrv);
427         local_irq_disable();
428         return IRQ_HANDLED;
429 }
430
431 /* --------------------------------------------------------------------- */
432
433 enum uart { c_uart_unknown, c_uart_8250,
434             c_uart_16450, c_uart_16550, c_uart_16550A};
435 static const char *uart_str[] = { 
436         "unknown", "8250", "16450", "16550", "16550A" 
437 };
438
439 static enum uart ser12_check_uart(unsigned int iobase)
440 {
441         unsigned char b1,b2,b3;
442         enum uart u;
443         enum uart uart_tab[] =
444                 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
445
446         b1 = inb(MCR(iobase));
447         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
448         b2 = inb(MSR(iobase));
449         outb(0x1a, MCR(iobase));
450         b3 = inb(MSR(iobase)) & 0xf0;
451         outb(b1, MCR(iobase));                  /* restore old values */
452         outb(b2, MSR(iobase));
453         if (b3 != 0x90)
454                 return c_uart_unknown;
455         inb(RBR(iobase));
456         inb(RBR(iobase));
457         outb(0x01, FCR(iobase));                /* enable FIFOs */
458         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
459         if (u == c_uart_16450) {
460                 outb(0x5a, SCR(iobase));
461                 b1 = inb(SCR(iobase));
462                 outb(0xa5, SCR(iobase));
463                 b2 = inb(SCR(iobase));
464                 if ((b1 != 0x5a) || (b2 != 0xa5))
465                         u = c_uart_8250;
466         }
467         return u;
468 }
469
470 /* --------------------------------------------------------------------- */
471
472 static int ser12_open(struct net_device *dev)
473 {
474         struct baycom_state *bc = netdev_priv(dev);
475         enum uart u;
476
477         if (!dev || !bc)
478                 return -ENXIO;
479         if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
480             dev->irq < 2 || dev->irq > 15)
481                 return -ENXIO;
482         if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12"))
483                 return -EACCES;
484         memset(&bc->modem, 0, sizeof(bc->modem));
485         bc->hdrv.par.bitrate = 1200;
486         if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) {
487                 release_region(dev->base_addr, SER12_EXTENT);       
488                 return -EIO;
489         }
490         outb(0, FCR(dev->base_addr));  /* disable FIFOs */
491         outb(0x0d, MCR(dev->base_addr));
492         outb(0, IER(dev->base_addr));
493         if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
494                         "baycom_ser12", dev)) {
495                 release_region(dev->base_addr, SER12_EXTENT);       
496                 return -EBUSY;
497         }
498         /*
499          * enable transmitter empty interrupt
500          */
501         outb(2, IER(dev->base_addr));
502         /*
503          * set the SIO to 6 Bits/character and 19200 or 28800 baud, so that
504          * we get exactly (hopefully) 2 or 3 interrupts per radio symbol,
505          * depending on the usage of the software DCD routine
506          */
507         ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
508         printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n", 
509                bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
510         return 0;
511 }
512
513 /* --------------------------------------------------------------------- */
514
515 static int ser12_close(struct net_device *dev)
516 {
517         struct baycom_state *bc = netdev_priv(dev);
518
519         if (!dev || !bc)
520                 return -EINVAL;
521         /*
522          * disable interrupts
523          */
524         outb(0, IER(dev->base_addr));
525         outb(1, MCR(dev->base_addr));
526         free_irq(dev->irq, dev);
527         release_region(dev->base_addr, SER12_EXTENT);
528         printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
529                bc_drvname, dev->base_addr, dev->irq);
530         return 0;
531 }
532
533 /* --------------------------------------------------------------------- */
534 /*
535  * ===================== hdlcdrv driver interface =========================
536  */
537
538 /* --------------------------------------------------------------------- */
539
540 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
541                         struct hdlcdrv_ioctl *hi, int cmd);
542
543 /* --------------------------------------------------------------------- */
544
545 static struct hdlcdrv_ops ser12_ops = {
546         .drvname = bc_drvname,
547         .drvinfo = bc_drvinfo,
548         .open    = ser12_open,
549         .close   = ser12_close,
550         .ioctl   = baycom_ioctl,
551 };
552
553 /* --------------------------------------------------------------------- */
554
555 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
556 {
557         if (strchr(modestr, '*'))
558                 bc->opt_dcd = 0;
559         else if (strchr(modestr, '+'))
560                 bc->opt_dcd = -1;
561         else if (strchr(modestr, '@'))
562                 bc->opt_dcd = -2;
563         else
564                 bc->opt_dcd = 1;
565         return 0;
566 }
567
568 /* --------------------------------------------------------------------- */
569
570 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
571                         struct hdlcdrv_ioctl *hi, int cmd)
572 {
573         struct baycom_state *bc;
574         struct baycom_ioctl bi;
575
576         if (!dev)
577                 return -EINVAL;
578
579         bc = netdev_priv(dev);
580         BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
581
582         if (cmd != SIOCDEVPRIVATE)
583                 return -ENOIOCTLCMD;
584         switch (hi->cmd) {
585         default:
586                 break;
587
588         case HDLCDRVCTL_GETMODE:
589                 strcpy(hi->data.modename, "ser12");
590                 if (bc->opt_dcd <= 0)
591                         strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
592                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
593                         return -EFAULT;
594                 return 0;
595
596         case HDLCDRVCTL_SETMODE:
597                 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
598                         return -EACCES;
599                 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
600                 return baycom_setmode(bc, hi->data.modename);
601
602         case HDLCDRVCTL_MODELIST:
603                 strcpy(hi->data.modename, "ser12");
604                 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
605                         return -EFAULT;
606                 return 0;
607
608         case HDLCDRVCTL_MODEMPARMASK:
609                 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
610
611         }
612
613         if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
614                 return -EFAULT;
615         switch (bi.cmd) {
616         default:
617                 return -ENOIOCTLCMD;
618
619 #ifdef BAYCOM_DEBUG
620         case BAYCOMCTL_GETDEBUG:
621                 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
622                 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
623                 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
624                 break;
625 #endif /* BAYCOM_DEBUG */
626
627         }
628         if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
629                 return -EFAULT;
630         return 0;
631
632 }
633
634 /* --------------------------------------------------------------------- */
635
636 /*
637  * command line settable parameters
638  */
639 static char *mode[NR_PORTS] = { "ser12*", };
640 static int iobase[NR_PORTS] = { 0x3f8, };
641 static int irq[NR_PORTS] = { 4, };
642
643 module_param_array(mode, charp, NULL, 0);
644 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
645 module_param_array(iobase, int, NULL, 0);
646 MODULE_PARM_DESC(iobase, "baycom io base address");
647 module_param_array(irq, int, NULL, 0);
648 MODULE_PARM_DESC(irq, "baycom irq number");
649
650 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
651 MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
652 MODULE_LICENSE("GPL");
653
654 /* --------------------------------------------------------------------- */
655
656 static int __init init_baycomserhdx(void)
657 {
658         int i, found = 0;
659         char set_hw = 1;
660
661         printk(bc_drvinfo);
662         /*
663          * register net devices
664          */
665         for (i = 0; i < NR_PORTS; i++) {
666                 struct net_device *dev;
667                 struct baycom_state *bc;
668                 char ifname[IFNAMSIZ];
669
670                 sprintf(ifname, "bcsh%d", i);
671
672                 if (!mode[i])
673                         set_hw = 0;
674                 if (!set_hw)
675                         iobase[i] = irq[i] = 0;
676
677                 dev = hdlcdrv_register(&ser12_ops, 
678                                        sizeof(struct baycom_state),
679                                        ifname, iobase[i], irq[i], 0);
680                 if (IS_ERR(dev)) 
681                         break;
682
683                 bc = netdev_priv(dev);
684                 if (set_hw && baycom_setmode(bc, mode[i]))
685                         set_hw = 0;
686                 found++;
687                 baycom_device[i] = dev;
688         }
689
690         if (!found)
691                 return -ENXIO;
692         return 0;
693 }
694
695 static void __exit cleanup_baycomserhdx(void)
696 {
697         int i;
698
699         for(i = 0; i < NR_PORTS; i++) {
700                 struct net_device *dev = baycom_device[i];
701
702                 if (dev)
703                         hdlcdrv_unregister(dev);
704         }
705 }
706
707 module_init(init_baycomserhdx);
708 module_exit(cleanup_baycomserhdx);
709
710 /* --------------------------------------------------------------------- */
711
712 #ifndef MODULE
713
714 /*
715  * format: baycom_ser_hdx=io,irq,mode
716  * mode: ser12    hardware DCD
717  *       ser12*   software DCD
718  *       ser12@   hardware/software DCD, i.e. no explicit DCD signal but hardware
719  *                mutes audio input to the modem
720  *       ser12+   hardware DCD, inverted signal at DCD pin
721  */
722
723 static int __init baycom_ser_hdx_setup(char *str)
724 {
725         static unsigned nr_dev;
726         int ints[3];
727
728         if (nr_dev >= NR_PORTS)
729                 return 0;
730         str = get_options(str, 3, ints);
731         if (ints[0] < 2)
732                 return 0;
733         mode[nr_dev] = str;
734         iobase[nr_dev] = ints[1];
735         irq[nr_dev] = ints[2];
736         nr_dev++;
737         return 1;
738 }
739
740 __setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
741
742 #endif /* MODULE */
743 /* --------------------------------------------------------------------- */