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[PATCH] g_file_storage: fix obscure race condition
[linux/fpc-iii.git] / drivers / isdn / isdnloop / isdnloop.c
blob14e1f8fbc61f05643dd4abcf3f4ee1ba4261981a
1 /* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
2 *
3 * ISDN low-level module implementing a dummy loop driver.
4 *
5 * Copyright 1997 by Fritz Elfert (fritz@isdn4linux.de)
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 */
11
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/init.h>
16 #include <linux/sched.h>
17 #include "isdnloop.h"
18
19 static char *revision = "$Revision: 1.11.6.7 $";
20 static char *isdnloop_id = "loop0";
21
22 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
23 MODULE_AUTHOR("Fritz Elfert");
24 MODULE_LICENSE("GPL");
25 MODULE_PARM(isdnloop_id, "s");
26 MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
27
28 static int isdnloop_addcard(char *);
29
30 /*
31 * Free queue completely.
32 *
33 * Parameter:
34 * card = pointer to card struct
35 * channel = channel number
36 */
37 static void
38 isdnloop_free_queue(isdnloop_card * card, int channel)
39 {
40 struct sk_buff_head *queue = &card->bqueue[channel];
41
42 skb_queue_purge(queue);
43 card->sndcount[channel] = 0;
44 }
45
46 /*
47 * Send B-Channel data to another virtual card.
48 * This routine is called via timer-callback from isdnloop_pollbchan().
49 *
50 * Parameter:
51 * card = pointer to card struct.
52 * ch = channel number (0-based)
53 */
54 static void
55 isdnloop_bchan_send(isdnloop_card * card, int ch)
56 {
57 isdnloop_card *rcard = card->rcard[ch];
58 int rch = card->rch[ch], len, ack;
59 struct sk_buff *skb;
60 isdn_ctrl cmd;
61
62 while (card->sndcount[ch]) {
63 if ((skb = skb_dequeue(&card->bqueue[ch]))) {
64 len = skb->len;
65 card->sndcount[ch] -= len;
66 ack = *(skb->head); /* used as scratch area */
67 cmd.driver = card->myid;
68 cmd.arg = ch;
69 if (rcard){
70 rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
71 } else {
72 printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
73 dev_kfree_skb(skb);
74
75 };
76 cmd.command = ISDN_STAT_BSENT;
77 cmd.parm.length = len;
78 card->interface.statcallb(&cmd);
79 } else
80 card->sndcount[ch] = 0;
81 }
82 }
83
84 /*
85 * Send/Receive Data to/from the B-Channel.
86 * This routine is called via timer-callback.
87 * It schedules itself while any B-Channel is open.
88 *
89 * Parameter:
90 * data = pointer to card struct, set by kernel timer.data
91 */
92 static void
93 isdnloop_pollbchan(unsigned long data)
94 {
95 isdnloop_card *card = (isdnloop_card *) data;
96 unsigned long flags;
97
98 if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
99 isdnloop_bchan_send(card, 0);
100 if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
101 isdnloop_bchan_send(card, 1);
102 if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
103 /* schedule b-channel polling again */
104 save_flags(flags);
105 cli();
106 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
107 add_timer(&card->rb_timer);
108 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
109 restore_flags(flags);
110 } else
111 card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
112 }
113
114 /*
115 * Parse ICN-type setup string and fill fields of setup-struct
116 * with parsed data.
117 *
118 * Parameter:
119 * setup = setup string, format: [caller-id],si1,si2,[called-id]
120 * cmd = pointer to struct to be filled.
121 */
122 static void
123 isdnloop_parse_setup(char *setup, isdn_ctrl * cmd)
124 {
125 char *t = setup;
126 char *s = strchr(t, ',');
127
128 *s++ = '\0';
129 strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
130 s = strchr(t = s, ',');
131 *s++ = '\0';
132 if (!strlen(t))
133 cmd->parm.setup.si1 = 0;
134 else
135 cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
136 s = strchr(t = s, ',');
137 *s++ = '\0';
138 if (!strlen(t))
139 cmd->parm.setup.si2 = 0;
140 else
141 cmd->parm.setup.si2 =
142 simple_strtoul(t, NULL, 10);
143 strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
144 cmd->parm.setup.plan = 0;
145 cmd->parm.setup.screen = 0;
146 }
147
148 typedef struct isdnloop_stat {
149 char *statstr;
150 int command;
151 int action;
152 } isdnloop_stat;
153 /* *INDENT-OFF* */
154 static isdnloop_stat isdnloop_stat_table[] =
155 {
156 {"BCON_", ISDN_STAT_BCONN, 1}, /* B-Channel connected */
157 {"BDIS_", ISDN_STAT_BHUP, 2}, /* B-Channel disconnected */
158 {"DCON_", ISDN_STAT_DCONN, 0}, /* D-Channel connected */
159 {"DDIS_", ISDN_STAT_DHUP, 0}, /* D-Channel disconnected */
160 {"DCAL_I", ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line */
161 {"DSCA_I", ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV */
162 {"FCALL", ISDN_STAT_ICALL, 4}, /* Leased line connection up */
163 {"CIF", ISDN_STAT_CINF, 5}, /* Charge-info, 1TR6-type */
164 {"AOC", ISDN_STAT_CINF, 6}, /* Charge-info, DSS1-type */
165 {"CAU", ISDN_STAT_CAUSE, 7}, /* Cause code */
166 {"TEI OK", ISDN_STAT_RUN, 0}, /* Card connected to wallplug */
167 {"E_L1: ACT FAIL", ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
168 {"E_L2: DATA LIN", ISDN_STAT_BHUP, 8}, /* Layer-2 data link lost */
169 {"E_L1: ACTIVATION FAILED",
170 ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
171 {NULL, 0, -1}
172 };
173 /* *INDENT-ON* */
174
175
176 /*
177 * Parse Status message-strings from virtual card.
178 * Depending on status, call statcallb for sending messages to upper
179 * levels. Also set/reset B-Channel active-flags.
180 *
181 * Parameter:
182 * status = status string to parse.
183 * channel = channel where message comes from.
184 * card = card where message comes from.
185 */
186 static void
187 isdnloop_parse_status(u_char * status, int channel, isdnloop_card * card)
188 {
189 isdnloop_stat *s = isdnloop_stat_table;
190 int action = -1;
191 isdn_ctrl cmd;
192
193 while (s->statstr) {
194 if (!strncmp(status, s->statstr, strlen(s->statstr))) {
195 cmd.command = s->command;
196 action = s->action;
197 break;
198 }
199 s++;
200 }
201 if (action == -1)
202 return;
203 cmd.driver = card->myid;
204 cmd.arg = channel;
205 switch (action) {
206 case 1:
207 /* BCON_x */
208 card->flags |= (channel) ?
209 ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
210 break;
211 case 2:
212 /* BDIS_x */
213 card->flags &= ~((channel) ?
214 ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
215 isdnloop_free_queue(card, channel);
216 break;
217 case 3:
218 /* DCAL_I and DSCA_I */
219 isdnloop_parse_setup(status + 6, &cmd);
220 break;
221 case 4:
222 /* FCALL */
223 sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
224 sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
225 cmd.parm.setup.si1 = 7;
226 cmd.parm.setup.si2 = 0;
227 cmd.parm.setup.plan = 0;
228 cmd.parm.setup.screen = 0;
229 break;
230 case 5:
231 /* CIF */
232 strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
233 break;
234 case 6:
235 /* AOC */
236 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
237 (int) simple_strtoul(status + 7, NULL, 16));
238 break;
239 case 7:
240 /* CAU */
241 status += 3;
242 if (strlen(status) == 4)
243 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
244 status + 2, *status, *(status + 1));
245 else
246 strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
247 break;
248 case 8:
249 /* Misc Errors on L1 and L2 */
250 card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
251 isdnloop_free_queue(card, 0);
252 cmd.arg = 0;
253 cmd.driver = card->myid;
254 card->interface.statcallb(&cmd);
255 cmd.command = ISDN_STAT_DHUP;
256 cmd.arg = 0;
257 cmd.driver = card->myid;
258 card->interface.statcallb(&cmd);
259 cmd.command = ISDN_STAT_BHUP;
260 card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
261 isdnloop_free_queue(card, 1);
262 cmd.arg = 1;
263 cmd.driver = card->myid;
264 card->interface.statcallb(&cmd);
265 cmd.command = ISDN_STAT_DHUP;
266 cmd.arg = 1;
267 cmd.driver = card->myid;
268 break;
269 }
270 card->interface.statcallb(&cmd);
271 }
272
273 /*
274 * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
275 *
276 * Parameter:
277 * card = pointer to card struct.
278 * c = char to store.
279 */
280 static void
281 isdnloop_putmsg(isdnloop_card * card, unsigned char c)
282 {
283 ulong flags;
284
285 save_flags(flags);
286 cli();
287 *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
288 if (card->msg_buf_write == card->msg_buf_read) {
289 if (++card->msg_buf_read > card->msg_buf_end)
290 card->msg_buf_read = card->msg_buf;
291 }
292 if (card->msg_buf_write > card->msg_buf_end)
293 card->msg_buf_write = card->msg_buf;
294 restore_flags(flags);
295 }
296
297 /*
298 * Poll a virtual cards message queue.
299 * If there are new status-replies from the card, copy them to
300 * ringbuffer for reading on /dev/isdnctrl and call
301 * isdnloop_parse_status() for processing them. Watch for special
302 * Firmware bootmessage and parse it, to get the D-Channel protocol.
303 * If there are B-Channels open, initiate a timer-callback to
304 * isdnloop_pollbchan().
305 * This routine is called periodically via timer interrupt.
306 *
307 * Parameter:
308 * data = pointer to card struct
309 */
310 static void
311 isdnloop_polldchan(unsigned long data)
312 {
313 isdnloop_card *card = (isdnloop_card *) data;
314 struct sk_buff *skb;
315 int avail;
316 int left;
317 u_char c;
318 int ch;
319 unsigned long flags;
320 u_char *p;
321 isdn_ctrl cmd;
322
323 if ((skb = skb_dequeue(&card->dqueue)))
324 avail = skb->len;
325 else
326 avail = 0;
327 for (left = avail; left > 0; left--) {
328 c = *skb->data;
329 skb_pull(skb, 1);
330 isdnloop_putmsg(card, c);
331 card->imsg[card->iptr] = c;
332 if (card->iptr < 59)
333 card->iptr++;
334 if (!skb->len) {
335 avail++;
336 isdnloop_putmsg(card, '\n');
337 card->imsg[card->iptr] = 0;
338 card->iptr = 0;
339 if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
340 card->imsg[1] <= '2' && card->imsg[2] == ';') {
341 ch = (card->imsg[1] - '0') - 1;
342 p = &card->imsg[3];
343 isdnloop_parse_status(p, ch, card);
344 } else {
345 p = card->imsg;
346 if (!strncmp(p, "DRV1.", 5)) {
347 printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
348 if (!strncmp(p + 7, "TC", 2)) {
349 card->ptype = ISDN_PTYPE_1TR6;
350 card->interface.features |= ISDN_FEATURE_P_1TR6;
351 printk(KERN_INFO
352 "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
353 }
354 if (!strncmp(p + 7, "EC", 2)) {
355 card->ptype = ISDN_PTYPE_EURO;
356 card->interface.features |= ISDN_FEATURE_P_EURO;
357 printk(KERN_INFO
358 "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
359 }
360 continue;
361
362 }
363 }
364 }
365 }
366 if (avail) {
367 cmd.command = ISDN_STAT_STAVAIL;
368 cmd.driver = card->myid;
369 cmd.arg = avail;
370 card->interface.statcallb(&cmd);
371 }
372 if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
373 if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
374 /* schedule b-channel polling */
375 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
376 save_flags(flags);
377 cli();
378 del_timer(&card->rb_timer);
379 card->rb_timer.function = isdnloop_pollbchan;
380 card->rb_timer.data = (unsigned long) card;
381 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
382 add_timer(&card->rb_timer);
383 restore_flags(flags);
384 }
385 /* schedule again */
386 save_flags(flags);
387 cli();
388 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
389 add_timer(&card->st_timer);
390 restore_flags(flags);
391 }
392
393 /*
394 * Append a packet to the transmit buffer-queue.
395 *
396 * Parameter:
397 * channel = Number of B-channel
398 * skb = packet to send.
399 * card = pointer to card-struct
400 * Return:
401 * Number of bytes transferred, -E??? on error
402 */
403 static int
404 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card * card)
405 {
406 int len = skb->len;
407 unsigned long flags;
408 struct sk_buff *nskb;
409
410 if (len > 4000) {
411 printk(KERN_WARNING
412 "isdnloop: Send packet too large\n");
413 return -EINVAL;
414 }
415 if (len) {
416 if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
417 return 0;
418 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
419 return 0;
420 save_flags(flags);
421 cli();
422 nskb = dev_alloc_skb(skb->len);
423 if (nskb) {
424 memcpy(skb_put(nskb, len), skb->data, len);
425 skb_queue_tail(&card->bqueue[channel], nskb);
426 dev_kfree_skb(skb);
427 } else
428 len = 0;
429 card->sndcount[channel] += len;
430 restore_flags(flags);
431 }
432 return len;
433 }
434
435 /*
436 * Read the messages from the card's ringbuffer
437 *
438 * Parameter:
439 * buf = pointer to buffer.
440 * len = number of bytes to read.
441 * user = flag, 1: called from userlevel 0: called from kernel.
442 * card = pointer to card struct.
443 * Return:
444 * number of bytes actually transferred.
445 */
446 static int
447 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
448 {
449 int count;
450 u_char __user *p;
451
452 for (p = buf, count = 0; count < len; p++, count++) {
453 if (card->msg_buf_read == card->msg_buf_write)
454 return count;
455 put_user(*card->msg_buf_read++, p);
456 if (card->msg_buf_read > card->msg_buf_end)
457 card->msg_buf_read = card->msg_buf;
458 }
459 return count;
460 }
461
462 /*
463 * Simulate a card's response by appending it to the cards
464 * message queue.
465 *
466 * Parameter:
467 * card = pointer to card struct.
468 * s = pointer to message-string.
469 * ch = channel: 0 = generic messages, 1 and 2 = D-channel messages.
470 * Return:
471 * 0 on success, 1 on memory squeeze.
472 */
473 static int
474 isdnloop_fake(isdnloop_card * card, char *s, int ch)
475 {
476 struct sk_buff *skb;
477 int len = strlen(s) + ((ch >= 0) ? 3 : 0);
478
479 if (!(skb = dev_alloc_skb(len))) {
480 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
481 return 1;
482 }
483 if (ch >= 0)
484 sprintf(skb_put(skb, 3), "%02d;", ch);
485 memcpy(skb_put(skb, strlen(s)), s, strlen(s));
486 skb_queue_tail(&card->dqueue, skb);
487 return 0;
488 }
489 /* *INDENT-OFF* */
490 static isdnloop_stat isdnloop_cmd_table[] =
491 {
492 {"BCON_R", 0, 1}, /* B-Channel connect */
493 {"BCON_I", 0, 17}, /* B-Channel connect ind */
494 {"BDIS_R", 0, 2}, /* B-Channel disconnect */
495 {"DDIS_R", 0, 3}, /* D-Channel disconnect */
496 {"DCON_R", 0, 16}, /* D-Channel connect */
497 {"DSCA_R", 0, 4}, /* Dial 1TR6-SPV */
498 {"DCAL_R", 0, 5}, /* Dial */
499 {"EAZC", 0, 6}, /* Clear EAZ listener */
500 {"EAZ", 0, 7}, /* Set EAZ listener */
501 {"SEEAZ", 0, 8}, /* Get EAZ listener */
502 {"MSN", 0, 9}, /* Set/Clear MSN listener */
503 {"MSALL", 0, 10}, /* Set multi MSN listeners */
504 {"SETSIL", 0, 11}, /* Set SI list */
505 {"SEESIL", 0, 12}, /* Get SI list */
506 {"SILC", 0, 13}, /* Clear SI list */
507 {"LOCK", 0, -1}, /* LOCK channel */
508 {"UNLOCK", 0, -1}, /* UNLOCK channel */
509 {"FV2ON", 1, 14}, /* Leased mode on */
510 {"FV2OFF", 1, 15}, /* Leased mode off */
511 {NULL, 0, -1}
512 };
513 /* *INDENT-ON* */
514
515
516 /*
517 * Simulate an error-response from a card.
518 *
519 * Parameter:
520 * card = pointer to card struct.
521 */
522 static void
523 isdnloop_fake_err(isdnloop_card * card)
524 {
525 char buf[60];
526
527 sprintf(buf, "E%s", card->omsg);
528 isdnloop_fake(card, buf, -1);
529 isdnloop_fake(card, "NAK", -1);
530 }
531
532 static u_char ctable_eu[] =
533 {0x00, 0x11, 0x01, 0x12};
534 static u_char ctable_1t[] =
535 {0x00, 0x3b, 0x01, 0x3a};
536
537 /*
538 * Assemble a simplified cause message depending on the
539 * D-channel protocol used.
540 *
541 * Parameter:
542 * card = pointer to card struct.
543 * loc = location: 0 = local, 1 = remote.
544 * cau = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
545 * Return:
546 * Pointer to buffer containing the assembled message.
547 */
548 static char *
549 isdnloop_unicause(isdnloop_card * card, int loc, int cau)
550 {
551 static char buf[6];
552
553 switch (card->ptype) {
554 case ISDN_PTYPE_EURO:
555 sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
556 break;
557 case ISDN_PTYPE_1TR6:
558 sprintf(buf, "%02X44", ctable_1t[cau]);
559 break;
560 default:
561 return ("0000");
562 }
563 return (buf);
564 }
565
566 /*
567 * Release a virtual connection. Called from timer interrupt, when
568 * called party did not respond.
569 *
570 * Parameter:
571 * card = pointer to card struct.
572 * ch = channel (0-based)
573 */
574 static void
575 isdnloop_atimeout(isdnloop_card * card, int ch)
576 {
577 unsigned long flags;
578 char buf[60];
579
580 save_flags(flags);
581 cli();
582 if (card->rcard) {
583 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
584 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
585 card->rcard[ch] = NULL;
586 }
587 isdnloop_fake(card, "DDIS_I", ch + 1);
588 /* No user responding */
589 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
590 isdnloop_fake(card, buf, ch + 1);
591 restore_flags(flags);
592 }
593
594 /*
595 * Wrapper for isdnloop_atimeout().
596 */
597 static void
598 isdnloop_atimeout0(unsigned long data)
599 {
600 isdnloop_card *card = (isdnloop_card *) data;
601 isdnloop_atimeout(card, 0);
602 }
603
604 /*
605 * Wrapper for isdnloop_atimeout().
606 */
607 static void
608 isdnloop_atimeout1(unsigned long data)
609 {
610 isdnloop_card *card = (isdnloop_card *) data;
611 isdnloop_atimeout(card, 1);
612 }
613
614 /*
615 * Install a watchdog for a user, not responding.
616 *
617 * Parameter:
618 * card = pointer to card struct.
619 * ch = channel to watch for.
620 */
621 static void
622 isdnloop_start_ctimer(isdnloop_card * card, int ch)
623 {
624 unsigned long flags;
625
626 save_flags(flags);
627 cli();
628 init_timer(&card->c_timer[ch]);
629 card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
630 if (ch)
631 card->c_timer[ch].function = isdnloop_atimeout1;
632 else
633 card->c_timer[ch].function = isdnloop_atimeout0;
634 card->c_timer[ch].data = (unsigned long) card;
635 add_timer(&card->c_timer[ch]);
636 restore_flags(flags);
637 }
638
639 /*
640 * Kill a pending channel watchdog.
641 *
642 * Parameter:
643 * card = pointer to card struct.
644 * ch = channel (0-based).
645 */
646 static void
647 isdnloop_kill_ctimer(isdnloop_card * card, int ch)
648 {
649 unsigned long flags;
650
651 save_flags(flags);
652 cli();
653 del_timer(&card->c_timer[ch]);
654 restore_flags(flags);
655 }
656
657 static u_char si2bit[] =
658 {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
659 static u_char bit2si[] =
660 {1, 5, 7};
661
662 /*
663 * Try finding a listener for an outgoing call.
664 *
665 * Parameter:
666 * card = pointer to calling card.
667 * p = pointer to ICN-type setup-string.
668 * lch = channel of calling card.
669 * cmd = pointer to struct to be filled when parsing setup.
670 * Return:
671 * 0 = found match, alerting should happen.
672 * 1 = found matching number but it is busy.
673 * 2 = no matching listener.
674 * 3 = found matching number but SI does not match.
675 */
676 static int
677 isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
678 {
679 isdnloop_card *cc = cards;
680 unsigned long flags;
681 int ch;
682 int num_match;
683 int i;
684 char *e;
685 char nbuf[32];
686
687 isdnloop_parse_setup(p, cmd);
688 while (cc) {
689 for (ch = 0; ch < 2; ch++) {
690 /* Exclude ourself */
691 if ((cc == card) && (ch == lch))
692 continue;
693 num_match = 0;
694 switch (cc->ptype) {
695 case ISDN_PTYPE_EURO:
696 for (i = 0; i < 3; i++)
697 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
698 num_match = 1;
699 break;
700 case ISDN_PTYPE_1TR6:
701 e = cc->eazlist[ch];
702 while (*e) {
703 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
704 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
705 num_match = 1;
706 e++;
707 }
708 }
709 if (num_match) {
710 save_flags(flags);
711 cli();
712 /* channel idle? */
713 if (!(cc->rcard[ch])) {
714 /* Check SI */
715 if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
716 restore_flags(flags);
717 return 3;
718 }
719 /* ch is idle, si and number matches */
720 cc->rcard[ch] = card;
721 cc->rch[ch] = lch;
722 card->rcard[lch] = cc;
723 card->rch[lch] = ch;
724 restore_flags(flags);
725 return 0;
726 } else {
727 restore_flags(flags);
728 /* num matches, but busy */
729 if (ch == 1)
730 return 1;
731 }
732 }
733 }
734 cc = cc->next;
735 }
736 return 2;
737 }
738
739 /*
740 * Depending on D-channel protocol and caller/called, modify
741 * phone number.
742 *
743 * Parameter:
744 * card = pointer to card struct.
745 * phone = pointer phone number.
746 * caller = flag: 1 = caller, 0 = called.
747 * Return:
748 * pointer to new phone number.
749 */
750 static char *
751 isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
752 {
753 int i;
754 static char nphone[30];
755
756 if (!card) {
757 printk("BUG!!!\n");
758 return "";
759 }
760 switch (card->ptype) {
761 case ISDN_PTYPE_EURO:
762 if (caller) {
763 for (i = 0; i < 2; i++)
764 if (!(strcmp(card->s0num[i], phone)))
765 return (phone);
766 return (card->s0num[0]);
767 }
768 return (phone);
769 break;
770 case ISDN_PTYPE_1TR6:
771 if (caller) {
772 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
773 return (nphone);
774 } else
775 return (&phone[strlen(phone) - 1]);
776 break;
777 }
778 return "";
779 }
780
781 /*
782 * Parse an ICN-type command string sent to the 'card'.
783 * Perform misc. actions depending on the command.
784 *
785 * Parameter:
786 * card = pointer to card struct.
787 */
788 static void
789 isdnloop_parse_cmd(isdnloop_card * card)
790 {
791 char *p = card->omsg;
792 isdn_ctrl cmd;
793 char buf[60];
794 isdnloop_stat *s = isdnloop_cmd_table;
795 int action = -1;
796 int i;
797 int ch;
798
799 if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
800 isdnloop_fake_err(card);
801 return;
802 }
803 ch = card->omsg[1] - '0';
804 if ((ch < 0) || (ch > 2)) {
805 isdnloop_fake_err(card);
806 return;
807 }
808 p += 3;
809 while (s->statstr) {
810 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
811 action = s->action;
812 if (s->command && (ch != 0)) {
813 isdnloop_fake_err(card);
814 return;
815 }
816 break;
817 }
818 s++;
819 }
820 if (action == -1)
821 return;
822 switch (action) {
823 case 1:
824 /* 0x;BCON_R */
825 if (card->rcard[ch - 1]) {
826 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
827 card->rch[ch - 1] + 1);
828 isdnloop_fake(card, "BCON_C", ch);
829 }
830 break;
831 case 17:
832 /* 0x;BCON_I */
833 if (card->rcard[ch - 1]) {
834 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
835 card->rch[ch - 1] + 1);
836 }
837 break;
838 case 2:
839 /* 0x;BDIS_R */
840 isdnloop_fake(card, "BDIS_C", ch);
841 if (card->rcard[ch - 1]) {
842 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
843 card->rch[ch - 1] + 1);
844 }
845 break;
846 case 16:
847 /* 0x;DCON_R */
848 isdnloop_kill_ctimer(card, ch - 1);
849 if (card->rcard[ch - 1]) {
850 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
851 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
852 card->rch[ch - 1] + 1);
853 isdnloop_fake(card, "DCON_C", ch);
854 }
855 break;
856 case 3:
857 /* 0x;DDIS_R */
858 isdnloop_kill_ctimer(card, ch - 1);
859 if (card->rcard[ch - 1]) {
860 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
861 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
862 card->rch[ch - 1] + 1);
863 card->rcard[ch - 1] = NULL;
864 }
865 isdnloop_fake(card, "DDIS_C", ch);
866 break;
867 case 4:
868 /* 0x;DSCA_Rdd,yy,zz,oo */
869 if (card->ptype != ISDN_PTYPE_1TR6) {
870 isdnloop_fake_err(card);
871 return;
872 }
873 /* Fall through */
874 case 5:
875 /* 0x;DCAL_Rdd,yy,zz,oo */
876 p += 6;
877 switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
878 case 0:
879 /* Alerting */
880 sprintf(buf, "D%s_I%s,%02d,%02d,%s",
881 (action == 4) ? "SCA" : "CAL",
882 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
883 cmd.parm.setup.si1,
884 cmd.parm.setup.si2,
885 isdnloop_vstphone(card->rcard[ch - 1],
886 cmd.parm.setup.phone, 0));
887 isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
888 /* Fall through */
889 case 3:
890 /* si1 does not match, don't alert but start timer */
891 isdnloop_start_ctimer(card, ch - 1);
892 break;
893 case 1:
894 /* Remote busy */
895 isdnloop_fake(card, "DDIS_I", ch);
896 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
897 isdnloop_fake(card, buf, ch);
898 break;
899 case 2:
900 /* No such user */
901 isdnloop_fake(card, "DDIS_I", ch);
902 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
903 isdnloop_fake(card, buf, ch);
904 break;
905 }
906 break;
907 case 6:
908 /* 0x;EAZC */
909 card->eazlist[ch - 1][0] = '\0';
910 break;
911 case 7:
912 /* 0x;EAZ */
913 p += 3;
914 strcpy(card->eazlist[ch - 1], p);
915 break;
916 case 8:
917 /* 0x;SEEAZ */
918 sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
919 isdnloop_fake(card, buf, ch + 1);
920 break;
921 case 9:
922 /* 0x;MSN */
923 break;
924 case 10:
925 /* 0x;MSNALL */
926 break;
927 case 11:
928 /* 0x;SETSIL */
929 p += 6;
930 i = 0;
931 while (strchr("0157", *p)) {
932 if (i)
933 card->sil[ch - 1] |= si2bit[*p - '0'];
934 i = (*p++ == '0');
935 }
936 if (*p)
937 isdnloop_fake_err(card);
938 break;
939 case 12:
940 /* 0x;SEESIL */
941 sprintf(buf, "SIN-LIST: ");
942 p = buf + 10;
943 for (i = 0; i < 3; i++)
944 if (card->sil[ch - 1] & (1 << i))
945 p += sprintf(p, "%02d", bit2si[i]);
946 isdnloop_fake(card, buf, ch + 1);
947 break;
948 case 13:
949 /* 0x;SILC */
950 card->sil[ch - 1] = 0;
951 break;
952 case 14:
953 /* 00;FV2ON */
954 break;
955 case 15:
956 /* 00;FV2OFF */
957 break;
958 }
959 }
960
961 /*
962 * Put command-strings into the of the 'card'. In reality, execute them
963 * right in place by calling isdnloop_parse_cmd(). Also copy every
964 * command to the read message ringbuffer, preceeding it with a '>'.
965 * These mesagges can be read at /dev/isdnctrl.
966 *
967 * Parameter:
968 * buf = pointer to command buffer.
969 * len = length of buffer data.
970 * user = flag: 1 = called form userlevel, 0 called from kernel.
971 * card = pointer to card struct.
972 * Return:
973 * number of bytes transferred (currently always equals len).
974 */
975 static int
976 isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
977 {
978 int xcount = 0;
979 int ocount = 1;
980 isdn_ctrl cmd;
981
982 while (len) {
983 int count = len;
984 u_char *p;
985 u_char msg[0x100];
986
987 if (count > 255)
988 count = 255;
989 if (user) {
990 if (copy_from_user(msg, buf, count))
991 return -EFAULT;
992 } else
993 memcpy(msg, buf, count);
994 isdnloop_putmsg(card, '>');
995 for (p = msg; count > 0; count--, p++) {
996 len--;
997 xcount++;
998 isdnloop_putmsg(card, *p);
999 card->omsg[card->optr] = *p;
1000 if (*p == '\n') {
1001 card->omsg[card->optr] = '\0';
1002 card->optr = 0;
1003 isdnloop_parse_cmd(card);
1004 if (len) {
1005 isdnloop_putmsg(card, '>');
1006 ocount++;
1007 }
1008 } else {
1009 if (card->optr < 59)
1010 card->optr++;
1011 }
1012 ocount++;
1013 }
1014 }
1015 cmd.command = ISDN_STAT_STAVAIL;
1016 cmd.driver = card->myid;
1017 cmd.arg = ocount;
1018 card->interface.statcallb(&cmd);
1019 return xcount;
1020 }
1021
1022 /*
1023 * Delete card's pending timers, send STOP to linklevel
1024 */
1025 static void
1026 isdnloop_stopcard(isdnloop_card * card)
1027 {
1028 unsigned long flags;
1029 isdn_ctrl cmd;
1030
1031 save_flags(flags);
1032 cli();
1033 if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1034 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1035 del_timer(&card->st_timer);
1036 del_timer(&card->rb_timer);
1037 del_timer(&card->c_timer[0]);
1038 del_timer(&card->c_timer[1]);
1039 cmd.command = ISDN_STAT_STOP;
1040 cmd.driver = card->myid;
1041 card->interface.statcallb(&cmd);
1042 }
1043 restore_flags(flags);
1044 }
1045
1046 /*
1047 * Stop all cards before unload.
1048 */
1049 static void
1050 isdnloop_stopallcards(void)
1051 {
1052 isdnloop_card *p = cards;
1053
1054 while (p) {
1055 isdnloop_stopcard(p);
1056 p = p->next;
1057 }
1058 }
1059
1060 /*
1061 * Start a 'card'. Simulate card's boot message and set the phone
1062 * number(s) of the virtual 'S0-Interface'. Install D-channel
1063 * poll timer.
1064 *
1065 * Parameter:
1066 * card = pointer to card struct.
1067 * sdefp = pointer to struct holding ioctl parameters.
1068 * Return:
1069 * 0 on success, -E??? otherwise.
1070 */
1071 static int
1072 isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
1073 {
1074 unsigned long flags;
1075 isdnloop_sdef sdef;
1076 int i;
1077
1078 if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1079 return -EBUSY;
1080 if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1081 return -EFAULT;
1082 save_flags(flags);
1083 cli();
1084 switch (sdef.ptype) {
1085 case ISDN_PTYPE_EURO:
1086 if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1087 -1)) {
1088 restore_flags(flags);
1089 return -ENOMEM;
1090 }
1091 card->sil[0] = card->sil[1] = 4;
1092 if (isdnloop_fake(card, "TEI OK", 0)) {
1093 restore_flags(flags);
1094 return -ENOMEM;
1095 }
1096 for (i = 0; i < 3; i++)
1097 strcpy(card->s0num[i], sdef.num[i]);
1098 break;
1099 case ISDN_PTYPE_1TR6:
1100 if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1101 -1)) {
1102 restore_flags(flags);
1103 return -ENOMEM;
1104 }
1105 card->sil[0] = card->sil[1] = 4;
1106 if (isdnloop_fake(card, "TEI OK", 0)) {
1107 restore_flags(flags);
1108 return -ENOMEM;
1109 }
1110 strcpy(card->s0num[0], sdef.num[0]);
1111 card->s0num[1][0] = '\0';
1112 card->s0num[2][0] = '\0';
1113 break;
1114 default:
1115 restore_flags(flags);
1116 printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1117 sdef.ptype);
1118 return -EINVAL;
1119 }
1120 init_timer(&card->st_timer);
1121 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1122 card->st_timer.function = isdnloop_polldchan;
1123 card->st_timer.data = (unsigned long) card;
1124 add_timer(&card->st_timer);
1125 card->flags |= ISDNLOOP_FLAGS_RUNNING;
1126 restore_flags(flags);
1127 return 0;
1128 }
1129
1130 /*
1131 * Main handler for commands sent by linklevel.
1132 */
1133 static int
1134 isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
1135 {
1136 ulong a;
1137 int i;
1138 char cbuf[60];
1139 isdn_ctrl cmd;
1140 isdnloop_cdef cdef;
1141
1142 switch (c->command) {
1143 case ISDN_CMD_IOCTL:
1144 memcpy(&a, c->parm.num, sizeof(ulong));
1145 switch (c->arg) {
1146 case ISDNLOOP_IOCTL_DEBUGVAR:
1147 return (ulong) card;
1148 case ISDNLOOP_IOCTL_STARTUP:
1149 if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1150 return -EFAULT;
1151 return (isdnloop_start(card, (isdnloop_sdef *) a));
1152 break;
1153 case ISDNLOOP_IOCTL_ADDCARD:
1154 if (copy_from_user((char *)&cdef,
1155 (char *)a,
1156 sizeof(cdef)))
1157 return -EFAULT;
1158 return (isdnloop_addcard(cdef.id1));
1159 break;
1160 case ISDNLOOP_IOCTL_LEASEDCFG:
1161 if (a) {
1162 if (!card->leased) {
1163 card->leased = 1;
1164 while (card->ptype == ISDN_PTYPE_UNKNOWN) {
1165 set_current_state(TASK_INTERRUPTIBLE);
1166 schedule_timeout(10);
1167 }
1168 set_current_state(TASK_INTERRUPTIBLE);
1169 schedule_timeout(10);
1170 sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1171 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1172 printk(KERN_INFO
1173 "isdnloop: (%s) Leased-line mode enabled\n",
1174 CID);
1175 cmd.command = ISDN_STAT_RUN;
1176 cmd.driver = card->myid;
1177 cmd.arg = 0;
1178 card->interface.statcallb(&cmd);
1179 }
1180 } else {
1181 if (card->leased) {
1182 card->leased = 0;
1183 sprintf(cbuf, "00;FV2OFF\n");
1184 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1185 printk(KERN_INFO
1186 "isdnloop: (%s) Leased-line mode disabled\n",
1187 CID);
1188 cmd.command = ISDN_STAT_RUN;
1189 cmd.driver = card->myid;
1190 cmd.arg = 0;
1191 card->interface.statcallb(&cmd);
1192 }
1193 }
1194 return 0;
1195 default:
1196 return -EINVAL;
1197 }
1198 break;
1199 case ISDN_CMD_DIAL:
1200 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1201 return -ENODEV;
1202 if (card->leased)
1203 break;
1204 if ((c->arg & 255) < ISDNLOOP_BCH) {
1205 char *p;
1206 char dial[50];
1207 char dcode[4];
1208
1209 a = c->arg;
1210 p = c->parm.setup.phone;
1211 if (*p == 's' || *p == 'S') {
1212 /* Dial for SPV */
1213 p++;
1214 strcpy(dcode, "SCA");
1215 } else
1216 /* Normal Dial */
1217 strcpy(dcode, "CAL");
1218 strcpy(dial, p);
1219 sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1220 dcode, dial, c->parm.setup.si1,
1221 c->parm.setup.si2, c->parm.setup.eazmsn);
1222 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1223 }
1224 break;
1225 case ISDN_CMD_ACCEPTD:
1226 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1227 return -ENODEV;
1228 if (c->arg < ISDNLOOP_BCH) {
1229 a = c->arg + 1;
1230 cbuf[0] = 0;
1231 switch (card->l2_proto[a - 1]) {
1232 case ISDN_PROTO_L2_X75I:
1233 sprintf(cbuf, "%02d;BX75\n", (int) a);
1234 break;
1235 #ifdef CONFIG_ISDN_X25
1236 case ISDN_PROTO_L2_X25DTE:
1237 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1238 break;
1239 case ISDN_PROTO_L2_X25DCE:
1240 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1241 break;
1242 #endif
1243 case ISDN_PROTO_L2_HDLC:
1244 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1245 break;
1246 }
1247 if (strlen(cbuf))
1248 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1249 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1250 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1251 }
1252 break;
1253 case ISDN_CMD_ACCEPTB:
1254 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1255 return -ENODEV;
1256 if (c->arg < ISDNLOOP_BCH) {
1257 a = c->arg + 1;
1258 switch (card->l2_proto[a - 1]) {
1259 case ISDN_PROTO_L2_X75I:
1260 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1261 break;
1262 #ifdef CONFIG_ISDN_X25
1263 case ISDN_PROTO_L2_X25DTE:
1264 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1265 break;
1266 case ISDN_PROTO_L2_X25DCE:
1267 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1268 break;
1269 #endif
1270 case ISDN_PROTO_L2_HDLC:
1271 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1272 break;
1273 default:
1274 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1275 }
1276 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1277 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1278 break;
1279 case ISDN_CMD_HANGUP:
1280 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1281 return -ENODEV;
1282 if (c->arg < ISDNLOOP_BCH) {
1283 a = c->arg + 1;
1284 sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1285 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1286 }
1287 break;
1288 case ISDN_CMD_SETEAZ:
1289 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1290 return -ENODEV;
1291 if (card->leased)
1292 break;
1293 if (c->arg < ISDNLOOP_BCH) {
1294 a = c->arg + 1;
1295 if (card->ptype == ISDN_PTYPE_EURO) {
1296 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1297 c->parm.num[0] ? "N" : "ALL", c->parm.num);
1298 } else
1299 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1300 c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1301 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1302 }
1303 break;
1304 case ISDN_CMD_CLREAZ:
1305 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1306 return -ENODEV;
1307 if (card->leased)
1308 break;
1309 if (c->arg < ISDNLOOP_BCH) {
1310 a = c->arg + 1;
1311 if (card->ptype == ISDN_PTYPE_EURO)
1312 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1313 else
1314 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1315 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1316 }
1317 break;
1318 case ISDN_CMD_SETL2:
1319 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1320 return -ENODEV;
1321 if ((c->arg & 255) < ISDNLOOP_BCH) {
1322 a = c->arg;
1323 switch (a >> 8) {
1324 case ISDN_PROTO_L2_X75I:
1325 sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1326 break;
1327 #ifdef CONFIG_ISDN_X25
1328 case ISDN_PROTO_L2_X25DTE:
1329 sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1330 break;
1331 case ISDN_PROTO_L2_X25DCE:
1332 sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1333 break;
1334 #endif
1335 case ISDN_PROTO_L2_HDLC:
1336 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1337 break;
1338 case ISDN_PROTO_L2_TRANS:
1339 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1340 break;
1341 default:
1342 return -EINVAL;
1343 }
1344 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1345 card->l2_proto[a & 255] = (a >> 8);
1346 }
1347 break;
1348 case ISDN_CMD_SETL3:
1349 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1350 return -ENODEV;
1351 return 0;
1352 default:
1353 return -EINVAL;
1354 }
1355 }
1356 return 0;
1357 }
1358
1359 /*
1360 * Find card with given driverId
1361 */
1362 static inline isdnloop_card *
1363 isdnloop_findcard(int driverid)
1364 {
1365 isdnloop_card *p = cards;
1366
1367 while (p) {
1368 if (p->myid == driverid)
1369 return p;
1370 p = p->next;
1371 }
1372 return (isdnloop_card *) 0;
1373 }
1374
1375 /*
1376 * Wrapper functions for interface to linklevel
1377 */
1378 static int
1379 if_command(isdn_ctrl * c)
1380 {
1381 isdnloop_card *card = isdnloop_findcard(c->driver);
1382
1383 if (card)
1384 return (isdnloop_command(c, card));
1385 printk(KERN_ERR
1386 "isdnloop: if_command called with invalid driverId!\n");
1387 return -ENODEV;
1388 }
1389
1390 static int
1391 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1392 {
1393 isdnloop_card *card = isdnloop_findcard(id);
1394
1395 if (card) {
1396 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1397 return -ENODEV;
1398 return (isdnloop_writecmd(buf, len, 1, card));
1399 }
1400 printk(KERN_ERR
1401 "isdnloop: if_writecmd called with invalid driverId!\n");
1402 return -ENODEV;
1403 }
1404
1405 static int
1406 if_readstatus(u_char __user *buf, int len, int id, int channel)
1407 {
1408 isdnloop_card *card = isdnloop_findcard(id);
1409
1410 if (card) {
1411 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1412 return -ENODEV;
1413 return (isdnloop_readstatus(buf, len, card));
1414 }
1415 printk(KERN_ERR
1416 "isdnloop: if_readstatus called with invalid driverId!\n");
1417 return -ENODEV;
1418 }
1419
1420 static int
1421 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1422 {
1423 isdnloop_card *card = isdnloop_findcard(id);
1424
1425 if (card) {
1426 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1427 return -ENODEV;
1428 /* ack request stored in skb scratch area */
1429 *(skb->head) = ack;
1430 return (isdnloop_sendbuf(channel, skb, card));
1431 }
1432 printk(KERN_ERR
1433 "isdnloop: if_sendbuf called with invalid driverId!\n");
1434 return -ENODEV;
1435 }
1436
1437 /*
1438 * Allocate a new card-struct, initialize it
1439 * link it into cards-list and register it at linklevel.
1440 */
1441 static isdnloop_card *
1442 isdnloop_initcard(char *id)
1443 {
1444 isdnloop_card *card;
1445 int i;
1446
1447 if (!(card = (isdnloop_card *) kmalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
1448 printk(KERN_WARNING
1449 "isdnloop: (%s) Could not allocate card-struct.\n", id);
1450 return (isdnloop_card *) 0;
1451 }
1452 memset((char *) card, 0, sizeof(isdnloop_card));
1453 card->interface.owner = THIS_MODULE;
1454 card->interface.channels = ISDNLOOP_BCH;
1455 card->interface.hl_hdrlen = 1; /* scratch area for storing ack flag*/
1456 card->interface.maxbufsize = 4000;
1457 card->interface.command = if_command;
1458 card->interface.writebuf_skb = if_sendbuf;
1459 card->interface.writecmd = if_writecmd;
1460 card->interface.readstat = if_readstatus;
1461 card->interface.features = ISDN_FEATURE_L2_X75I |
1462 #ifdef CONFIG_ISDN_X25
1463 ISDN_FEATURE_L2_X25DTE |
1464 ISDN_FEATURE_L2_X25DCE |
1465 #endif
1466 ISDN_FEATURE_L2_HDLC |
1467 ISDN_FEATURE_L3_TRANS |
1468 ISDN_FEATURE_P_UNKNOWN;
1469 card->ptype = ISDN_PTYPE_UNKNOWN;
1470 strlcpy(card->interface.id, id, sizeof(card->interface.id));
1471 card->msg_buf_write = card->msg_buf;
1472 card->msg_buf_read = card->msg_buf;
1473 card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1474 for (i = 0; i < ISDNLOOP_BCH; i++) {
1475 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1476 skb_queue_head_init(&card->bqueue[i]);
1477 }
1478 skb_queue_head_init(&card->dqueue);
1479 card->next = cards;
1480 cards = card;
1481 if (!register_isdn(&card->interface)) {
1482 cards = cards->next;
1483 printk(KERN_WARNING
1484 "isdnloop: Unable to register %s\n", id);
1485 kfree(card);
1486 return (isdnloop_card *) 0;
1487 }
1488 card->myid = card->interface.channels;
1489 return card;
1490 }
1491
1492 static int
1493 isdnloop_addcard(char *id1)
1494 {
1495 isdnloop_card *card;
1496
1497 if (!(card = isdnloop_initcard(id1))) {
1498 return -EIO;
1499 }
1500 printk(KERN_INFO
1501 "isdnloop: (%s) virtual card added\n",
1502 card->interface.id);
1503 return 0;
1504 }
1505
1506 static int __init
1507 isdnloop_init(void)
1508 {
1509 char *p;
1510 char rev[10];
1511
1512 if ((p = strchr(revision, ':'))) {
1513 strcpy(rev, p + 1);
1514 p = strchr(rev, '$');
1515 *p = 0;
1516 } else
1517 strcpy(rev, " ??? ");
1518 printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
1519
1520 if (isdnloop_id)
1521 return (isdnloop_addcard(isdnloop_id));
1522
1523 return 0;
1524 }
1525
1526 static void __exit
1527 isdnloop_exit(void)
1528 {
1529 isdn_ctrl cmd;
1530 isdnloop_card *card = cards;
1531 isdnloop_card *last;
1532 int i;
1533
1534 isdnloop_stopallcards();
1535 while (card) {
1536 cmd.command = ISDN_STAT_UNLOAD;
1537 cmd.driver = card->myid;
1538 card->interface.statcallb(&cmd);
1539 for (i = 0; i < ISDNLOOP_BCH; i++)
1540 isdnloop_free_queue(card, i);
1541 card = card->next;
1542 }
1543 card = cards;
1544 while (card) {
1545 last = card;
1546 skb_queue_purge(&card->dqueue);
1547 card = card->next;
1548 kfree(last);
1549 }
1550 printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1551 }
1552
1553 module_init(isdnloop_init);
1554 module_exit(isdnloop_exit);
Linux with added FPC-III support