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