[PATCH] drivers/isdn/isdnloop: save_flags()/cli(), restore_flags() replaced appropriately
[linux-2.6.git] / drivers / isdn / isdnloop / isdnloop.c
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/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include "isdnloop.h"
17
18 static char *revision = "$Revision: 1.11.6.7 $";
19 static char *isdnloop_id = "loop0";
20
21 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
22 MODULE_AUTHOR("Fritz Elfert");
23 MODULE_LICENSE("GPL");
24 module_param(isdnloop_id, charp, 0);
25 MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
26
27 static int isdnloop_addcard(char *);
28
29 /*
30  * Free queue completely.
31  *
32  * Parameter:
33  *   card    = pointer to card struct
34  *   channel = channel number
35  */
36 static void
37 isdnloop_free_queue(isdnloop_card * card, int channel)
38 {
39         struct sk_buff_head *queue = &card->bqueue[channel];
40
41         skb_queue_purge(queue);
42         card->sndcount[channel] = 0;
43 }
44
45 /*
46  * Send B-Channel data to another virtual card.
47  * This routine is called via timer-callback from isdnloop_pollbchan().
48  *
49  * Parameter:
50  *   card = pointer to card struct.
51  *   ch   = channel number (0-based)
52  */
53 static void
54 isdnloop_bchan_send(isdnloop_card * card, int ch)
55 {
56         isdnloop_card *rcard = card->rcard[ch];
57         int rch = card->rch[ch], len, ack;
58         struct sk_buff *skb;
59         isdn_ctrl cmd;
60
61         while (card->sndcount[ch]) {
62                 if ((skb = skb_dequeue(&card->bqueue[ch]))) {
63                         len = skb->len;
64                         card->sndcount[ch] -= len;
65                         ack = *(skb->head); /* used as scratch area */
66                         cmd.driver = card->myid;
67                         cmd.arg = ch;
68                         if (rcard){
69                                 rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
70                         } else {
71                                 printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
72                                 dev_kfree_skb(skb);
73
74                         };
75                         cmd.command = ISDN_STAT_BSENT;
76                         cmd.parm.length = len;
77                         card->interface.statcallb(&cmd);
78                 } else
79                         card->sndcount[ch] = 0;
80         }
81 }
82
83 /*
84  * Send/Receive Data to/from the B-Channel.
85  * This routine is called via timer-callback.
86  * It schedules itself while any B-Channel is open.
87  *
88  * Parameter:
89  *   data = pointer to card struct, set by kernel timer.data
90  */
91 static void
92 isdnloop_pollbchan(unsigned long data)
93 {
94         isdnloop_card *card = (isdnloop_card *) data;
95         unsigned long flags;
96
97         if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
98                 isdnloop_bchan_send(card, 0);
99         if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
100                 isdnloop_bchan_send(card, 1);
101         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
102                 /* schedule b-channel polling again */
103                 spin_lock_irqsave(&card->isdnloop_lock, flags);
104                 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
105                 add_timer(&card->rb_timer);
106                 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
107                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
108         } else
109                 card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
110 }
111
112 /*
113  * Parse ICN-type setup string and fill fields of setup-struct
114  * with parsed data.
115  *
116  * Parameter:
117  *   setup = setup string, format: [caller-id],si1,si2,[called-id]
118  *   cmd   = pointer to struct to be filled.
119  */
120 static void
121 isdnloop_parse_setup(char *setup, isdn_ctrl * cmd)
122 {
123         char *t = setup;
124         char *s = strchr(t, ',');
125
126         *s++ = '\0';
127         strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
128         s = strchr(t = s, ',');
129         *s++ = '\0';
130         if (!strlen(t))
131                 cmd->parm.setup.si1 = 0;
132         else
133                 cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
134         s = strchr(t = s, ',');
135         *s++ = '\0';
136         if (!strlen(t))
137                 cmd->parm.setup.si2 = 0;
138         else
139                 cmd->parm.setup.si2 =
140                     simple_strtoul(t, NULL, 10);
141         strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
142         cmd->parm.setup.plan = 0;
143         cmd->parm.setup.screen = 0;
144 }
145
146 typedef struct isdnloop_stat {
147         char *statstr;
148         int command;
149         int action;
150 } isdnloop_stat;
151 /* *INDENT-OFF* */
152 static isdnloop_stat isdnloop_stat_table[] =
153 {
154         {"BCON_",          ISDN_STAT_BCONN, 1}, /* B-Channel connected        */
155         {"BDIS_",          ISDN_STAT_BHUP,  2}, /* B-Channel disconnected     */
156         {"DCON_",          ISDN_STAT_DCONN, 0}, /* D-Channel connected        */
157         {"DDIS_",          ISDN_STAT_DHUP,  0}, /* D-Channel disconnected     */
158         {"DCAL_I",         ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line  */
159         {"DSCA_I",         ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV     */
160         {"FCALL",          ISDN_STAT_ICALL, 4}, /* Leased line connection up  */
161         {"CIF",            ISDN_STAT_CINF,  5}, /* Charge-info, 1TR6-type     */
162         {"AOC",            ISDN_STAT_CINF,  6}, /* Charge-info, DSS1-type     */
163         {"CAU",            ISDN_STAT_CAUSE, 7}, /* Cause code                 */
164         {"TEI OK",         ISDN_STAT_RUN,   0}, /* Card connected to wallplug */
165         {"E_L1: ACT FAIL", ISDN_STAT_BHUP,  8}, /* Layer-1 activation failed  */
166         {"E_L2: DATA LIN", ISDN_STAT_BHUP,  8}, /* Layer-2 data link lost     */
167         {"E_L1: ACTIVATION FAILED",
168                            ISDN_STAT_BHUP,  8},         /* Layer-1 activation failed  */
169         {NULL, 0, -1}
170 };
171 /* *INDENT-ON* */
172
173
174 /*
175  * Parse Status message-strings from virtual card.
176  * Depending on status, call statcallb for sending messages to upper
177  * levels. Also set/reset B-Channel active-flags.
178  *
179  * Parameter:
180  *   status  = status string to parse.
181  *   channel = channel where message comes from.
182  *   card    = card where message comes from.
183  */
184 static void
185 isdnloop_parse_status(u_char * status, int channel, isdnloop_card * card)
186 {
187         isdnloop_stat *s = isdnloop_stat_table;
188         int action = -1;
189         isdn_ctrl cmd;
190
191         while (s->statstr) {
192                 if (!strncmp(status, s->statstr, strlen(s->statstr))) {
193                         cmd.command = s->command;
194                         action = s->action;
195                         break;
196                 }
197                 s++;
198         }
199         if (action == -1)
200                 return;
201         cmd.driver = card->myid;
202         cmd.arg = channel;
203         switch (action) {
204                 case 1:
205                         /* BCON_x */
206                         card->flags |= (channel) ?
207                             ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
208                         break;
209                 case 2:
210                         /* BDIS_x */
211                         card->flags &= ~((channel) ?
212                                          ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
213                         isdnloop_free_queue(card, channel);
214                         break;
215                 case 3:
216                         /* DCAL_I and DSCA_I */
217                         isdnloop_parse_setup(status + 6, &cmd);
218                         break;
219                 case 4:
220                         /* FCALL */
221                         sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
222                         sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
223                         cmd.parm.setup.si1 = 7;
224                         cmd.parm.setup.si2 = 0;
225                         cmd.parm.setup.plan = 0;
226                         cmd.parm.setup.screen = 0;
227                         break;
228                 case 5:
229                         /* CIF */
230                         strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
231                         break;
232                 case 6:
233                         /* AOC */
234                         snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
235                              (int) simple_strtoul(status + 7, NULL, 16));
236                         break;
237                 case 7:
238                         /* CAU */
239                         status += 3;
240                         if (strlen(status) == 4)
241                                 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
242                                      status + 2, *status, *(status + 1));
243                         else
244                                 strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
245                         break;
246                 case 8:
247                         /* Misc Errors on L1 and L2 */
248                         card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
249                         isdnloop_free_queue(card, 0);
250                         cmd.arg = 0;
251                         cmd.driver = card->myid;
252                         card->interface.statcallb(&cmd);
253                         cmd.command = ISDN_STAT_DHUP;
254                         cmd.arg = 0;
255                         cmd.driver = card->myid;
256                         card->interface.statcallb(&cmd);
257                         cmd.command = ISDN_STAT_BHUP;
258                         card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
259                         isdnloop_free_queue(card, 1);
260                         cmd.arg = 1;
261                         cmd.driver = card->myid;
262                         card->interface.statcallb(&cmd);
263                         cmd.command = ISDN_STAT_DHUP;
264                         cmd.arg = 1;
265                         cmd.driver = card->myid;
266                         break;
267         }
268         card->interface.statcallb(&cmd);
269 }
270
271 /*
272  * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
273  *
274  * Parameter:
275  *   card = pointer to card struct.
276  *   c    = char to store.
277  */
278 static void
279 isdnloop_putmsg(isdnloop_card * card, unsigned char c)
280 {
281         ulong flags;
282
283         spin_lock_irqsave(&card->isdnloop_lock, flags);
284         *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
285         if (card->msg_buf_write == card->msg_buf_read) {
286                 if (++card->msg_buf_read > card->msg_buf_end)
287                         card->msg_buf_read = card->msg_buf;
288         }
289         if (card->msg_buf_write > card->msg_buf_end)
290                 card->msg_buf_write = card->msg_buf;
291         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
292 }
293
294 /*
295  * Poll a virtual cards message queue.
296  * If there are new status-replies from the card, copy them to
297  * ringbuffer for reading on /dev/isdnctrl and call
298  * isdnloop_parse_status() for processing them. Watch for special
299  * Firmware bootmessage and parse it, to get the D-Channel protocol.
300  * If there are B-Channels open, initiate a timer-callback to
301  * isdnloop_pollbchan().
302  * This routine is called periodically via timer interrupt.
303  *
304  * Parameter:
305  *   data = pointer to card struct
306  */
307 static void
308 isdnloop_polldchan(unsigned long data)
309 {
310         isdnloop_card *card = (isdnloop_card *) data;
311         struct sk_buff *skb;
312         int avail;
313         int left;
314         u_char c;
315         int ch;
316         unsigned long flags;
317         u_char *p;
318         isdn_ctrl cmd;
319
320         if ((skb = skb_dequeue(&card->dqueue)))
321                 avail = skb->len;
322         else
323                 avail = 0;
324         for (left = avail; left > 0; left--) {
325                 c = *skb->data;
326                 skb_pull(skb, 1);
327                 isdnloop_putmsg(card, c);
328                 card->imsg[card->iptr] = c;
329                 if (card->iptr < 59)
330                         card->iptr++;
331                 if (!skb->len) {
332                         avail++;
333                         isdnloop_putmsg(card, '\n');
334                         card->imsg[card->iptr] = 0;
335                         card->iptr = 0;
336                         if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
337                           card->imsg[1] <= '2' && card->imsg[2] == ';') {
338                                 ch = (card->imsg[1] - '0') - 1;
339                                 p = &card->imsg[3];
340                                 isdnloop_parse_status(p, ch, card);
341                         } else {
342                                 p = card->imsg;
343                                 if (!strncmp(p, "DRV1.", 5)) {
344                                         printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
345                                         if (!strncmp(p + 7, "TC", 2)) {
346                                                 card->ptype = ISDN_PTYPE_1TR6;
347                                                 card->interface.features |= ISDN_FEATURE_P_1TR6;
348                                                 printk(KERN_INFO
349                                                        "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
350                                         }
351                                         if (!strncmp(p + 7, "EC", 2)) {
352                                                 card->ptype = ISDN_PTYPE_EURO;
353                                                 card->interface.features |= ISDN_FEATURE_P_EURO;
354                                                 printk(KERN_INFO
355                                                        "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
356                                         }
357                                         continue;
358
359                                 }
360                         }
361                 }
362         }
363         if (avail) {
364                 cmd.command = ISDN_STAT_STAVAIL;
365                 cmd.driver = card->myid;
366                 cmd.arg = avail;
367                 card->interface.statcallb(&cmd);
368         }
369         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
370                 if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
371                         /* schedule b-channel polling */
372                         card->flags |= ISDNLOOP_FLAGS_RBTIMER;
373                         spin_lock_irqsave(&card->isdnloop_lock, flags);
374                         del_timer(&card->rb_timer);
375                         card->rb_timer.function = isdnloop_pollbchan;
376                         card->rb_timer.data = (unsigned long) card;
377                         card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
378                         add_timer(&card->rb_timer);
379                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
380                 }
381         /* schedule again */
382         spin_lock_irqsave(&card->isdnloop_lock, flags);
383         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
384         add_timer(&card->st_timer);
385         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
386 }
387
388 /*
389  * Append a packet to the transmit buffer-queue.
390  *
391  * Parameter:
392  *   channel = Number of B-channel
393  *   skb     = packet to send.
394  *   card    = pointer to card-struct
395  * Return:
396  *   Number of bytes transferred, -E??? on error
397  */
398 static int
399 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card * card)
400 {
401         int len = skb->len;
402         unsigned long flags;
403         struct sk_buff *nskb;
404
405         if (len > 4000) {
406                 printk(KERN_WARNING
407                        "isdnloop: Send packet too large\n");
408                 return -EINVAL;
409         }
410         if (len) {
411                 if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
412                         return 0;
413                 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
414                         return 0;
415                 spin_lock_irqsave(&card->isdnloop_lock, flags);
416                 nskb = dev_alloc_skb(skb->len);
417                 if (nskb) {
418                         memcpy(skb_put(nskb, len), skb->data, len);
419                         skb_queue_tail(&card->bqueue[channel], nskb);
420                         dev_kfree_skb(skb);
421                 } else
422                         len = 0;
423                 card->sndcount[channel] += len;
424                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
425         }
426         return len;
427 }
428
429 /*
430  * Read the messages from the card's ringbuffer
431  *
432  * Parameter:
433  *   buf  = pointer to buffer.
434  *   len  = number of bytes to read.
435  *   user = flag, 1: called from userlevel 0: called from kernel.
436  *   card = pointer to card struct.
437  * Return:
438  *   number of bytes actually transferred.
439  */
440 static int
441 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
442 {
443         int count;
444         u_char __user *p;
445
446         for (p = buf, count = 0; count < len; p++, count++) {
447                 if (card->msg_buf_read == card->msg_buf_write)
448                         return count;
449                 put_user(*card->msg_buf_read++, p);
450                 if (card->msg_buf_read > card->msg_buf_end)
451                         card->msg_buf_read = card->msg_buf;
452         }
453         return count;
454 }
455
456 /*
457  * Simulate a card's response by appending it to the cards
458  * message queue.
459  *
460  * Parameter:
461  *   card = pointer to card struct.
462  *   s    = pointer to message-string.
463  *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
464  * Return:
465  *   0 on success, 1 on memory squeeze.
466  */
467 static int
468 isdnloop_fake(isdnloop_card * card, char *s, int ch)
469 {
470         struct sk_buff *skb;
471         int len = strlen(s) + ((ch >= 0) ? 3 : 0);
472
473         if (!(skb = dev_alloc_skb(len))) {
474                 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
475                 return 1;
476         }
477         if (ch >= 0)
478                 sprintf(skb_put(skb, 3), "%02d;", ch);
479         memcpy(skb_put(skb, strlen(s)), s, strlen(s));
480         skb_queue_tail(&card->dqueue, skb);
481         return 0;
482 }
483 /* *INDENT-OFF* */
484 static isdnloop_stat isdnloop_cmd_table[] =
485 {
486         {"BCON_R",         0,  1},      /* B-Channel connect        */
487         {"BCON_I",         0, 17},      /* B-Channel connect ind    */
488         {"BDIS_R",         0,  2},      /* B-Channel disconnect     */
489         {"DDIS_R",         0,  3},      /* D-Channel disconnect     */
490         {"DCON_R",         0, 16},      /* D-Channel connect        */
491         {"DSCA_R",         0,  4},      /* Dial 1TR6-SPV     */
492         {"DCAL_R",         0,  5},      /* Dial */
493         {"EAZC",           0,  6},      /* Clear EAZ listener */
494         {"EAZ",            0,  7},      /* Set EAZ listener */
495         {"SEEAZ",          0,  8},      /* Get EAZ listener */
496         {"MSN",            0,  9},      /* Set/Clear MSN listener */
497         {"MSALL",          0, 10},      /* Set multi MSN listeners */
498         {"SETSIL",         0, 11},      /* Set SI list     */
499         {"SEESIL",         0, 12},      /* Get SI list     */
500         {"SILC",           0, 13},      /* Clear SI list     */
501         {"LOCK",           0, -1},      /* LOCK channel     */
502         {"UNLOCK",         0, -1},      /* UNLOCK channel     */
503         {"FV2ON",          1, 14},      /* Leased mode on               */
504         {"FV2OFF",         1, 15},      /* Leased mode off              */
505         {NULL, 0, -1}
506 };
507 /* *INDENT-ON* */
508
509
510 /*
511  * Simulate an error-response from a card.
512  *
513  * Parameter:
514  *   card = pointer to card struct.
515  */
516 static void
517 isdnloop_fake_err(isdnloop_card * card)
518 {
519         char buf[60];
520
521         sprintf(buf, "E%s", card->omsg);
522         isdnloop_fake(card, buf, -1);
523         isdnloop_fake(card, "NAK", -1);
524 }
525
526 static u_char ctable_eu[] =
527 {0x00, 0x11, 0x01, 0x12};
528 static u_char ctable_1t[] =
529 {0x00, 0x3b, 0x01, 0x3a};
530
531 /*
532  * Assemble a simplified cause message depending on the
533  * D-channel protocol used.
534  *
535  * Parameter:
536  *   card = pointer to card struct.
537  *   loc  = location: 0 = local, 1 = remote.
538  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
539  * Return:
540  *   Pointer to buffer containing the assembled message.
541  */
542 static char *
543 isdnloop_unicause(isdnloop_card * card, int loc, int cau)
544 {
545         static char buf[6];
546
547         switch (card->ptype) {
548                 case ISDN_PTYPE_EURO:
549                         sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
550                         break;
551                 case ISDN_PTYPE_1TR6:
552                         sprintf(buf, "%02X44", ctable_1t[cau]);
553                         break;
554                 default:
555                         return ("0000");
556         }
557         return (buf);
558 }
559
560 /*
561  * Release a virtual connection. Called from timer interrupt, when
562  * called party did not respond.
563  *
564  * Parameter:
565  *   card = pointer to card struct.
566  *   ch   = channel (0-based)
567  */
568 static void
569 isdnloop_atimeout(isdnloop_card * card, int ch)
570 {
571         unsigned long flags;
572         char buf[60];
573
574         spin_lock_irqsave(&card->isdnloop_lock, flags);
575         if (card->rcard) {
576                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
577                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
578                 card->rcard[ch] = NULL;
579         }
580         isdnloop_fake(card, "DDIS_I", ch + 1);
581         /* No user responding */
582         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
583         isdnloop_fake(card, buf, ch + 1);
584         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
585 }
586
587 /*
588  * Wrapper for isdnloop_atimeout().
589  */
590 static void
591 isdnloop_atimeout0(unsigned long data)
592 {
593         isdnloop_card *card = (isdnloop_card *) data;
594         isdnloop_atimeout(card, 0);
595 }
596
597 /*
598  * Wrapper for isdnloop_atimeout().
599  */
600 static void
601 isdnloop_atimeout1(unsigned long data)
602 {
603         isdnloop_card *card = (isdnloop_card *) data;
604         isdnloop_atimeout(card, 1);
605 }
606
607 /*
608  * Install a watchdog for a user, not responding.
609  *
610  * Parameter:
611  *   card = pointer to card struct.
612  *   ch   = channel to watch for.
613  */
614 static void
615 isdnloop_start_ctimer(isdnloop_card * card, int ch)
616 {
617         unsigned long flags;
618
619         spin_lock_irqsave(&card->isdnloop_lock, flags);
620         init_timer(&card->c_timer[ch]);
621         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
622         if (ch)
623                 card->c_timer[ch].function = isdnloop_atimeout1;
624         else
625                 card->c_timer[ch].function = isdnloop_atimeout0;
626         card->c_timer[ch].data = (unsigned long) card;
627         add_timer(&card->c_timer[ch]);
628         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
629 }
630
631 /*
632  * Kill a pending channel watchdog.
633  *
634  * Parameter:
635  *   card = pointer to card struct.
636  *   ch   = channel (0-based).
637  */
638 static void
639 isdnloop_kill_ctimer(isdnloop_card * card, int ch)
640 {
641         unsigned long flags;
642
643         spin_lock_irqsave(&card->isdnloop_lock, flags);
644         del_timer(&card->c_timer[ch]);
645         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
646 }
647
648 static u_char si2bit[] =
649 {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
650 static u_char bit2si[] =
651 {1, 5, 7};
652
653 /*
654  * Try finding a listener for an outgoing call.
655  *
656  * Parameter:
657  *   card = pointer to calling card.
658  *   p    = pointer to ICN-type setup-string.
659  *   lch  = channel of calling card.
660  *   cmd  = pointer to struct to be filled when parsing setup.
661  * Return:
662  *   0 = found match, alerting should happen.
663  *   1 = found matching number but it is busy.
664  *   2 = no matching listener.
665  *   3 = found matching number but SI does not match.
666  */
667 static int
668 isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
669 {
670         isdnloop_card *cc = cards;
671         unsigned long flags;
672         int ch;
673         int num_match;
674         int i;
675         char *e;
676         char nbuf[32];
677
678         isdnloop_parse_setup(p, cmd);
679         while (cc) {
680                 for (ch = 0; ch < 2; ch++) {
681                         /* Exclude ourself */
682                         if ((cc == card) && (ch == lch))
683                                 continue;
684                         num_match = 0;
685                         switch (cc->ptype) {
686                                 case ISDN_PTYPE_EURO:
687                                         for (i = 0; i < 3; i++)
688                                                 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
689                                                         num_match = 1;
690                                         break;
691                                 case ISDN_PTYPE_1TR6:
692                                         e = cc->eazlist[ch];
693                                         while (*e) {
694                                                 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
695                                                 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
696                                                         num_match = 1;
697                                                 e++;
698                                         }
699                         }
700                         if (num_match) {
701                                 spin_lock_irqsave(&card->isdnloop_lock, flags);
702                                 /* channel idle? */
703                                 if (!(cc->rcard[ch])) {
704                                         /* Check SI */
705                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
706                                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
707                                                 return 3;
708                                         }
709                                         /* ch is idle, si and number matches */
710                                         cc->rcard[ch] = card;
711                                         cc->rch[ch] = lch;
712                                         card->rcard[lch] = cc;
713                                         card->rch[lch] = ch;
714                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
715                                         return 0;
716                                 } else {
717                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
718                                         /* num matches, but busy */
719                                         if (ch == 1)
720                                                 return 1;
721                                 }
722                         }
723                 }
724                 cc = cc->next;
725         }
726         return 2;
727 }
728
729 /*
730  * Depending on D-channel protocol and caller/called, modify
731  * phone number.
732  *
733  * Parameter:
734  *   card   = pointer to card struct.
735  *   phone  = pointer phone number.
736  *   caller = flag: 1 = caller, 0 = called.
737  * Return:
738  *   pointer to new phone number.
739  */
740 static char *
741 isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
742 {
743         int i;
744         static char nphone[30];
745
746         if (!card) {
747                 printk("BUG!!!\n");
748                 return "";
749         }
750         switch (card->ptype) {
751                 case ISDN_PTYPE_EURO:
752                         if (caller) {
753                                 for (i = 0; i < 2; i++)
754                                         if (!(strcmp(card->s0num[i], phone)))
755                                                 return (phone);
756                                 return (card->s0num[0]);
757                         }
758                         return (phone);
759                         break;
760                 case ISDN_PTYPE_1TR6:
761                         if (caller) {
762                                 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
763                                 return (nphone);
764                         } else
765                                 return (&phone[strlen(phone) - 1]);
766                         break;
767         }
768         return "";
769 }
770
771 /*
772  * Parse an ICN-type command string sent to the 'card'.
773  * Perform misc. actions depending on the command.
774  *
775  * Parameter:
776  *   card = pointer to card struct.
777  */
778 static void
779 isdnloop_parse_cmd(isdnloop_card * card)
780 {
781         char *p = card->omsg;
782         isdn_ctrl cmd;
783         char buf[60];
784         isdnloop_stat *s = isdnloop_cmd_table;
785         int action = -1;
786         int i;
787         int ch;
788
789         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
790                 isdnloop_fake_err(card);
791                 return;
792         }
793         ch = card->omsg[1] - '0';
794         if ((ch < 0) || (ch > 2)) {
795                 isdnloop_fake_err(card);
796                 return;
797         }
798         p += 3;
799         while (s->statstr) {
800                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
801                         action = s->action;
802                         if (s->command && (ch != 0)) {
803                                 isdnloop_fake_err(card);
804                                 return;
805                         }
806                         break;
807                 }
808                 s++;
809         }
810         if (action == -1)
811                 return;
812         switch (action) {
813                 case 1:
814                         /* 0x;BCON_R */
815                         if (card->rcard[ch - 1]) {
816                                 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
817                                               card->rch[ch - 1] + 1);
818                                 isdnloop_fake(card, "BCON_C", ch);
819                         }
820                         break;
821                 case 17:
822                         /* 0x;BCON_I */
823                         if (card->rcard[ch - 1]) {
824                                 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
825                                               card->rch[ch - 1] + 1);
826                         }
827                         break;
828                 case 2:
829                         /* 0x;BDIS_R */
830                         isdnloop_fake(card, "BDIS_C", ch);
831                         if (card->rcard[ch - 1]) {
832                                 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
833                                               card->rch[ch - 1] + 1);
834                         }
835                         break;
836                 case 16:
837                         /* 0x;DCON_R */
838                         isdnloop_kill_ctimer(card, ch - 1);
839                         if (card->rcard[ch - 1]) {
840                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
841                                 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
842                                               card->rch[ch - 1] + 1);
843                                 isdnloop_fake(card, "DCON_C", ch);
844                         }
845                         break;
846                 case 3:
847                         /* 0x;DDIS_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], "DDIS_I",
852                                               card->rch[ch - 1] + 1);
853                                 card->rcard[ch - 1] = NULL;
854                         }
855                         isdnloop_fake(card, "DDIS_C", ch);
856                         break;
857                 case 4:
858                         /* 0x;DSCA_Rdd,yy,zz,oo */
859                         if (card->ptype != ISDN_PTYPE_1TR6) {
860                                 isdnloop_fake_err(card);
861                                 return;
862                         }
863                         /* Fall through */
864                 case 5:
865                         /* 0x;DCAL_Rdd,yy,zz,oo */
866                         p += 6;
867                         switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
868                                 case 0:
869                                         /* Alerting */
870                                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
871                                            (action == 4) ? "SCA" : "CAL",
872                                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
873                                                 cmd.parm.setup.si1,
874                                                 cmd.parm.setup.si2,
875                                         isdnloop_vstphone(card->rcard[ch - 1],
876                                                cmd.parm.setup.phone, 0));
877                                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
878                                         /* Fall through */
879                                 case 3:
880                                         /* si1 does not match, don't alert but start timer */
881                                         isdnloop_start_ctimer(card, ch - 1);
882                                         break;
883                                 case 1:
884                                         /* Remote busy */
885                                         isdnloop_fake(card, "DDIS_I", ch);
886                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
887                                         isdnloop_fake(card, buf, ch);
888                                         break;
889                                 case 2:
890                                         /* No such user */
891                                         isdnloop_fake(card, "DDIS_I", ch);
892                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
893                                         isdnloop_fake(card, buf, ch);
894                                         break;
895                         }
896                         break;
897                 case 6:
898                         /* 0x;EAZC */
899                         card->eazlist[ch - 1][0] = '\0';
900                         break;
901                 case 7:
902                         /* 0x;EAZ */
903                         p += 3;
904                         strcpy(card->eazlist[ch - 1], p);
905                         break;
906                 case 8:
907                         /* 0x;SEEAZ */
908                         sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
909                         isdnloop_fake(card, buf, ch + 1);
910                         break;
911                 case 9:
912                         /* 0x;MSN */
913                         break;
914                 case 10:
915                         /* 0x;MSNALL */
916                         break;
917                 case 11:
918                         /* 0x;SETSIL */
919                         p += 6;
920                         i = 0;
921                         while (strchr("0157", *p)) {
922                                 if (i)
923                                         card->sil[ch - 1] |= si2bit[*p - '0'];
924                                 i = (*p++ == '0');
925                         }
926                         if (*p)
927                                 isdnloop_fake_err(card);
928                         break;
929                 case 12:
930                         /* 0x;SEESIL */
931                         sprintf(buf, "SIN-LIST: ");
932                         p = buf + 10;
933                         for (i = 0; i < 3; i++)
934                                 if (card->sil[ch - 1] & (1 << i))
935                                         p += sprintf(p, "%02d", bit2si[i]);
936                         isdnloop_fake(card, buf, ch + 1);
937                         break;
938                 case 13:
939                         /* 0x;SILC */
940                         card->sil[ch - 1] = 0;
941                         break;
942                 case 14:
943                         /* 00;FV2ON */
944                         break;
945                 case 15:
946                         /* 00;FV2OFF */
947                         break;
948         }
949 }
950
951 /*
952  * Put command-strings into the of the 'card'. In reality, execute them
953  * right in place by calling isdnloop_parse_cmd(). Also copy every
954  * command to the read message ringbuffer, preceeding it with a '>'.
955  * These mesagges can be read at /dev/isdnctrl.
956  *
957  * Parameter:
958  *   buf  = pointer to command buffer.
959  *   len  = length of buffer data.
960  *   user = flag: 1 = called form userlevel, 0 called from kernel.
961  *   card = pointer to card struct.
962  * Return:
963  *   number of bytes transferred (currently always equals len).
964  */
965 static int
966 isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
967 {
968         int xcount = 0;
969         int ocount = 1;
970         isdn_ctrl cmd;
971
972         while (len) {
973                 int count = len;
974                 u_char *p;
975                 u_char msg[0x100];
976
977                 if (count > 255)
978                         count = 255;
979                 if (user) {
980                         if (copy_from_user(msg, buf, count))
981                                 return -EFAULT;
982                 } else
983                         memcpy(msg, buf, count);
984                 isdnloop_putmsg(card, '>');
985                 for (p = msg; count > 0; count--, p++) {
986                         len--;
987                         xcount++;
988                         isdnloop_putmsg(card, *p);
989                         card->omsg[card->optr] = *p;
990                         if (*p == '\n') {
991                                 card->omsg[card->optr] = '\0';
992                                 card->optr = 0;
993                                 isdnloop_parse_cmd(card);
994                                 if (len) {
995                                         isdnloop_putmsg(card, '>');
996                                         ocount++;
997                                 }
998                         } else {
999                                 if (card->optr < 59)
1000                                         card->optr++;
1001                         }
1002                         ocount++;
1003                 }
1004         }
1005         cmd.command = ISDN_STAT_STAVAIL;
1006         cmd.driver = card->myid;
1007         cmd.arg = ocount;
1008         card->interface.statcallb(&cmd);
1009         return xcount;
1010 }
1011
1012 /*
1013  * Delete card's pending timers, send STOP to linklevel
1014  */
1015 static void
1016 isdnloop_stopcard(isdnloop_card * card)
1017 {
1018         unsigned long flags;
1019         isdn_ctrl cmd;
1020
1021         spin_lock_irqsave(&card->isdnloop_lock, flags);
1022         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1023                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1024                 del_timer(&card->st_timer);
1025                 del_timer(&card->rb_timer);
1026                 del_timer(&card->c_timer[0]);
1027                 del_timer(&card->c_timer[1]);
1028                 cmd.command = ISDN_STAT_STOP;
1029                 cmd.driver = card->myid;
1030                 card->interface.statcallb(&cmd);
1031         }
1032         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1033 }
1034
1035 /*
1036  * Stop all cards before unload.
1037  */
1038 static void
1039 isdnloop_stopallcards(void)
1040 {
1041         isdnloop_card *p = cards;
1042
1043         while (p) {
1044                 isdnloop_stopcard(p);
1045                 p = p->next;
1046         }
1047 }
1048
1049 /*
1050  * Start a 'card'. Simulate card's boot message and set the phone
1051  * number(s) of the virtual 'S0-Interface'. Install D-channel
1052  * poll timer.
1053  *
1054  * Parameter:
1055  *   card  = pointer to card struct.
1056  *   sdefp = pointer to struct holding ioctl parameters.
1057  * Return:
1058  *   0 on success, -E??? otherwise.
1059  */
1060 static int
1061 isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
1062 {
1063         unsigned long flags;
1064         isdnloop_sdef sdef;
1065         int i;
1066
1067         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1068                 return -EBUSY;
1069         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1070                 return -EFAULT;
1071         spin_lock_irqsave(&card->isdnloop_lock, flags);
1072         switch (sdef.ptype) {
1073                 case ISDN_PTYPE_EURO:
1074                         if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1075                                           -1)) {
1076                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1077                                 return -ENOMEM;
1078                         }
1079                         card->sil[0] = card->sil[1] = 4;
1080                         if (isdnloop_fake(card, "TEI OK", 0)) {
1081                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1082                                 return -ENOMEM;
1083                         }
1084                         for (i = 0; i < 3; i++)
1085                                 strcpy(card->s0num[i], sdef.num[i]);
1086                         break;
1087                 case ISDN_PTYPE_1TR6:
1088                         if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1089                                           -1)) {
1090                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1091                                 return -ENOMEM;
1092                         }
1093                         card->sil[0] = card->sil[1] = 4;
1094                         if (isdnloop_fake(card, "TEI OK", 0)) {
1095                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1096                                 return -ENOMEM;
1097                         }
1098                         strcpy(card->s0num[0], sdef.num[0]);
1099                         card->s0num[1][0] = '\0';
1100                         card->s0num[2][0] = '\0';
1101                         break;
1102                 default:
1103                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1104                         printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1105                                sdef.ptype);
1106                         return -EINVAL;
1107         }
1108         init_timer(&card->st_timer);
1109         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1110         card->st_timer.function = isdnloop_polldchan;
1111         card->st_timer.data = (unsigned long) card;
1112         add_timer(&card->st_timer);
1113         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1114         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1115         return 0;
1116 }
1117
1118 /*
1119  * Main handler for commands sent by linklevel.
1120  */
1121 static int
1122 isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
1123 {
1124         ulong a;
1125         int i;
1126         char cbuf[60];
1127         isdn_ctrl cmd;
1128         isdnloop_cdef cdef;
1129
1130         switch (c->command) {
1131                 case ISDN_CMD_IOCTL:
1132                         memcpy(&a, c->parm.num, sizeof(ulong));
1133                         switch (c->arg) {
1134                                 case ISDNLOOP_IOCTL_DEBUGVAR:
1135                                         return (ulong) card;
1136                                 case ISDNLOOP_IOCTL_STARTUP:
1137                                         if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1138                                                 return -EFAULT;
1139                                         return (isdnloop_start(card, (isdnloop_sdef *) a));
1140                                         break;
1141                                 case ISDNLOOP_IOCTL_ADDCARD:
1142                                         if (copy_from_user((char *)&cdef,
1143                                                            (char *)a,
1144                                                            sizeof(cdef)))
1145                                                 return -EFAULT;
1146                                         return (isdnloop_addcard(cdef.id1));
1147                                         break;
1148                                 case ISDNLOOP_IOCTL_LEASEDCFG:
1149                                         if (a) {
1150                                                 if (!card->leased) {
1151                                                         card->leased = 1;
1152                                                         while (card->ptype == ISDN_PTYPE_UNKNOWN)
1153                                                                 schedule_timeout_interruptible(10);
1154                                                         schedule_timeout_interruptible(10);
1155                                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1156                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1157                                                         printk(KERN_INFO
1158                                                                "isdnloop: (%s) Leased-line mode enabled\n",
1159                                                                CID);
1160                                                         cmd.command = ISDN_STAT_RUN;
1161                                                         cmd.driver = card->myid;
1162                                                         cmd.arg = 0;
1163                                                         card->interface.statcallb(&cmd);
1164                                                 }
1165                                         } else {
1166                                                 if (card->leased) {
1167                                                         card->leased = 0;
1168                                                         sprintf(cbuf, "00;FV2OFF\n");
1169                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1170                                                         printk(KERN_INFO
1171                                                                "isdnloop: (%s) Leased-line mode disabled\n",
1172                                                                CID);
1173                                                         cmd.command = ISDN_STAT_RUN;
1174                                                         cmd.driver = card->myid;
1175                                                         cmd.arg = 0;
1176                                                         card->interface.statcallb(&cmd);
1177                                                 }
1178                                         }
1179                                         return 0;
1180                                 default:
1181                                         return -EINVAL;
1182                         }
1183                         break;
1184                 case ISDN_CMD_DIAL:
1185                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1186                                 return -ENODEV;
1187                         if (card->leased)
1188                                 break;
1189                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1190                                 char *p;
1191                                 char dial[50];
1192                                 char dcode[4];
1193
1194                                 a = c->arg;
1195                                 p = c->parm.setup.phone;
1196                                 if (*p == 's' || *p == 'S') {
1197                                         /* Dial for SPV */
1198                                         p++;
1199                                         strcpy(dcode, "SCA");
1200                                 } else
1201                                         /* Normal Dial */
1202                                         strcpy(dcode, "CAL");
1203                                 strcpy(dial, p);
1204                                 sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1205                                         dcode, dial, c->parm.setup.si1,
1206                                 c->parm.setup.si2, c->parm.setup.eazmsn);
1207                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1208                         }
1209                         break;
1210                 case ISDN_CMD_ACCEPTD:
1211                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1212                                 return -ENODEV;
1213                         if (c->arg < ISDNLOOP_BCH) {
1214                                 a = c->arg + 1;
1215                                 cbuf[0] = 0;
1216                                 switch (card->l2_proto[a - 1]) {
1217                                         case ISDN_PROTO_L2_X75I:
1218                                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1219                                                 break;
1220 #ifdef CONFIG_ISDN_X25
1221                                         case ISDN_PROTO_L2_X25DTE:
1222                                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1223                                                 break;
1224                                         case ISDN_PROTO_L2_X25DCE:
1225                                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1226                                                 break;
1227 #endif
1228                                         case ISDN_PROTO_L2_HDLC:
1229                                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1230                                                 break;
1231                                 }
1232                                 if (strlen(cbuf))
1233                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1234                                 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1235                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1236                         }
1237                         break;
1238                 case ISDN_CMD_ACCEPTB:
1239                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1240                                 return -ENODEV;
1241                         if (c->arg < ISDNLOOP_BCH) {
1242                                 a = c->arg + 1;
1243                                 switch (card->l2_proto[a - 1]) {
1244                                         case ISDN_PROTO_L2_X75I:
1245                                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1246                                                 break;
1247 #ifdef CONFIG_ISDN_X25
1248                                         case ISDN_PROTO_L2_X25DTE:
1249                                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1250                                                 break;
1251                                         case ISDN_PROTO_L2_X25DCE:
1252                                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1253                                                 break;
1254 #endif
1255                                         case ISDN_PROTO_L2_HDLC:
1256                                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1257                                                 break;
1258                                         default:
1259                                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1260                                 }
1261                                 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1262                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1263                                 break;
1264                 case ISDN_CMD_HANGUP:
1265                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1266                                         return -ENODEV;
1267                                 if (c->arg < ISDNLOOP_BCH) {
1268                                         a = c->arg + 1;
1269                                         sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1270                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1271                                 }
1272                                 break;
1273                 case ISDN_CMD_SETEAZ:
1274                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1275                                         return -ENODEV;
1276                                 if (card->leased)
1277                                         break;
1278                                 if (c->arg < ISDNLOOP_BCH) {
1279                                         a = c->arg + 1;
1280                                         if (card->ptype == ISDN_PTYPE_EURO) {
1281                                                 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1282                                                         c->parm.num[0] ? "N" : "ALL", c->parm.num);
1283                                         } else
1284                                                 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1285                                                         c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1286                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1287                                 }
1288                                 break;
1289                 case ISDN_CMD_CLREAZ:
1290                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1291                                         return -ENODEV;
1292                                 if (card->leased)
1293                                         break;
1294                                 if (c->arg < ISDNLOOP_BCH) {
1295                                         a = c->arg + 1;
1296                                         if (card->ptype == ISDN_PTYPE_EURO)
1297                                                 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1298                                         else
1299                                                 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1300                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1301                                 }
1302                                 break;
1303                 case ISDN_CMD_SETL2:
1304                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1305                                         return -ENODEV;
1306                                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1307                                         a = c->arg;
1308                                         switch (a >> 8) {
1309                                                 case ISDN_PROTO_L2_X75I:
1310                                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1311                                                         break;
1312 #ifdef CONFIG_ISDN_X25
1313                                                 case ISDN_PROTO_L2_X25DTE:
1314                                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1315                                                         break;
1316                                                 case ISDN_PROTO_L2_X25DCE:
1317                                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1318                                                         break;
1319 #endif
1320                                                 case ISDN_PROTO_L2_HDLC:
1321                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1322                                                         break;
1323                                                 case ISDN_PROTO_L2_TRANS:
1324                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1325                                                         break;
1326                                                 default:
1327                                                         return -EINVAL;
1328                                         }
1329                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1330                                         card->l2_proto[a & 255] = (a >> 8);
1331                                 }
1332                                 break;
1333                 case ISDN_CMD_SETL3:
1334                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1335                                         return -ENODEV;
1336                                 return 0;
1337                 default:
1338                                 return -EINVAL;
1339                         }
1340         }
1341         return 0;
1342 }
1343
1344 /*
1345  * Find card with given driverId
1346  */
1347 static inline isdnloop_card *
1348 isdnloop_findcard(int driverid)
1349 {
1350         isdnloop_card *p = cards;
1351
1352         while (p) {
1353                 if (p->myid == driverid)
1354                         return p;
1355                 p = p->next;
1356         }
1357         return (isdnloop_card *) 0;
1358 }
1359
1360 /*
1361  * Wrapper functions for interface to linklevel
1362  */
1363 static int
1364 if_command(isdn_ctrl * c)
1365 {
1366         isdnloop_card *card = isdnloop_findcard(c->driver);
1367
1368         if (card)
1369                 return (isdnloop_command(c, card));
1370         printk(KERN_ERR
1371                "isdnloop: if_command called with invalid driverId!\n");
1372         return -ENODEV;
1373 }
1374
1375 static int
1376 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1377 {
1378         isdnloop_card *card = isdnloop_findcard(id);
1379
1380         if (card) {
1381                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1382                         return -ENODEV;
1383                 return (isdnloop_writecmd(buf, len, 1, card));
1384         }
1385         printk(KERN_ERR
1386                "isdnloop: if_writecmd called with invalid driverId!\n");
1387         return -ENODEV;
1388 }
1389
1390 static int
1391 if_readstatus(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_readstatus(buf, len, card));
1399         }
1400         printk(KERN_ERR
1401                "isdnloop: if_readstatus called with invalid driverId!\n");
1402         return -ENODEV;
1403 }
1404
1405 static int
1406 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1407 {
1408         isdnloop_card *card = isdnloop_findcard(id);
1409
1410         if (card) {
1411                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1412                         return -ENODEV;
1413                 /* ack request stored in skb scratch area */
1414                 *(skb->head) = ack;
1415                 return (isdnloop_sendbuf(channel, skb, card));
1416         }
1417         printk(KERN_ERR
1418                "isdnloop: if_sendbuf called with invalid driverId!\n");
1419         return -ENODEV;
1420 }
1421
1422 /*
1423  * Allocate a new card-struct, initialize it
1424  * link it into cards-list and register it at linklevel.
1425  */
1426 static isdnloop_card *
1427 isdnloop_initcard(char *id)
1428 {
1429         isdnloop_card *card;
1430         int i;
1431
1432         if (!(card = (isdnloop_card *) kmalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
1433                 printk(KERN_WARNING
1434                  "isdnloop: (%s) Could not allocate card-struct.\n", id);
1435                 return (isdnloop_card *) 0;
1436         }
1437         memset((char *) card, 0, sizeof(isdnloop_card));
1438         card->interface.owner = THIS_MODULE;
1439         card->interface.channels = ISDNLOOP_BCH;
1440         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/ 
1441         card->interface.maxbufsize = 4000;
1442         card->interface.command = if_command;
1443         card->interface.writebuf_skb = if_sendbuf;
1444         card->interface.writecmd = if_writecmd;
1445         card->interface.readstat = if_readstatus;
1446         card->interface.features = ISDN_FEATURE_L2_X75I |
1447 #ifdef CONFIG_ISDN_X25
1448             ISDN_FEATURE_L2_X25DTE |
1449             ISDN_FEATURE_L2_X25DCE |
1450 #endif
1451             ISDN_FEATURE_L2_HDLC |
1452             ISDN_FEATURE_L3_TRANS |
1453             ISDN_FEATURE_P_UNKNOWN;
1454         card->ptype = ISDN_PTYPE_UNKNOWN;
1455         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1456         card->msg_buf_write = card->msg_buf;
1457         card->msg_buf_read = card->msg_buf;
1458         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1459         for (i = 0; i < ISDNLOOP_BCH; i++) {
1460                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1461                 skb_queue_head_init(&card->bqueue[i]);
1462         }
1463         skb_queue_head_init(&card->dqueue);
1464         card->isdnloop_lock = SPIN_LOCK_UNLOCKED;
1465         card->next = cards;
1466         cards = card;
1467         if (!register_isdn(&card->interface)) {
1468                 cards = cards->next;
1469                 printk(KERN_WARNING
1470                        "isdnloop: Unable to register %s\n", id);
1471                 kfree(card);
1472                 return (isdnloop_card *) 0;
1473         }
1474         card->myid = card->interface.channels;
1475         return card;
1476 }
1477
1478 static int
1479 isdnloop_addcard(char *id1)
1480 {
1481         isdnloop_card *card;
1482
1483         if (!(card = isdnloop_initcard(id1))) {
1484                 return -EIO;
1485         }
1486         printk(KERN_INFO
1487                "isdnloop: (%s) virtual card added\n",
1488                card->interface.id);
1489         return 0;
1490 }
1491
1492 static int __init
1493 isdnloop_init(void)
1494 {
1495         char *p;
1496         char rev[10];
1497
1498         if ((p = strchr(revision, ':'))) {
1499                 strcpy(rev, p + 1);
1500                 p = strchr(rev, '$');
1501                 *p = 0;
1502         } else
1503                 strcpy(rev, " ??? ");
1504         printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
1505
1506         if (isdnloop_id)
1507                 return (isdnloop_addcard(isdnloop_id));
1508
1509         return 0;
1510 }
1511
1512 static void __exit
1513 isdnloop_exit(void)
1514 {
1515         isdn_ctrl cmd;
1516         isdnloop_card *card = cards;
1517         isdnloop_card *last;
1518         int i;
1519
1520         isdnloop_stopallcards();
1521         while (card) {
1522                 cmd.command = ISDN_STAT_UNLOAD;
1523                 cmd.driver = card->myid;
1524                 card->interface.statcallb(&cmd);
1525                 for (i = 0; i < ISDNLOOP_BCH; i++)
1526                         isdnloop_free_queue(card, i);
1527                 card = card->next;
1528         }
1529         card = cards;
1530         while (card) {
1531                 last = card;
1532                 skb_queue_purge(&card->dqueue);
1533                 card = card->next;
1534                 kfree(last);
1535         }
1536         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1537 }
1538
1539 module_init(isdnloop_init);
1540 module_exit(isdnloop_exit);