[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}
[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                         skb_copy_from_linear_data(skb,
419                                                   skb_put(nskb, len), len);
420                         skb_queue_tail(&card->bqueue[channel], nskb);
421                         dev_kfree_skb(skb);
422                 } else
423                         len = 0;
424                 card->sndcount[channel] += len;
425                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
426         }
427         return len;
428 }
429
430 /*
431  * Read the messages from the card's ringbuffer
432  *
433  * Parameter:
434  *   buf  = pointer to buffer.
435  *   len  = number of bytes to read.
436  *   user = flag, 1: called from userlevel 0: called from kernel.
437  *   card = pointer to card struct.
438  * Return:
439  *   number of bytes actually transferred.
440  */
441 static int
442 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
443 {
444         int count;
445         u_char __user *p;
446
447         for (p = buf, count = 0; count < len; p++, count++) {
448                 if (card->msg_buf_read == card->msg_buf_write)
449                         return count;
450                 if (put_user(*card->msg_buf_read++, p))
451                         return -EFAULT;
452                 if (card->msg_buf_read > card->msg_buf_end)
453                         card->msg_buf_read = card->msg_buf;
454         }
455         return count;
456 }
457
458 /*
459  * Simulate a card's response by appending it to the cards
460  * message queue.
461  *
462  * Parameter:
463  *   card = pointer to card struct.
464  *   s    = pointer to message-string.
465  *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
466  * Return:
467  *   0 on success, 1 on memory squeeze.
468  */
469 static int
470 isdnloop_fake(isdnloop_card * card, char *s, int ch)
471 {
472         struct sk_buff *skb;
473         int len = strlen(s) + ((ch >= 0) ? 3 : 0);
474
475         if (!(skb = dev_alloc_skb(len))) {
476                 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
477                 return 1;
478         }
479         if (ch >= 0)
480                 sprintf(skb_put(skb, 3), "%02d;", ch);
481         memcpy(skb_put(skb, strlen(s)), s, strlen(s));
482         skb_queue_tail(&card->dqueue, skb);
483         return 0;
484 }
485 /* *INDENT-OFF* */
486 static isdnloop_stat isdnloop_cmd_table[] =
487 {
488         {"BCON_R",         0,  1},      /* B-Channel connect        */
489         {"BCON_I",         0, 17},      /* B-Channel connect ind    */
490         {"BDIS_R",         0,  2},      /* B-Channel disconnect     */
491         {"DDIS_R",         0,  3},      /* D-Channel disconnect     */
492         {"DCON_R",         0, 16},      /* D-Channel connect        */
493         {"DSCA_R",         0,  4},      /* Dial 1TR6-SPV     */
494         {"DCAL_R",         0,  5},      /* Dial */
495         {"EAZC",           0,  6},      /* Clear EAZ listener */
496         {"EAZ",            0,  7},      /* Set EAZ listener */
497         {"SEEAZ",          0,  8},      /* Get EAZ listener */
498         {"MSN",            0,  9},      /* Set/Clear MSN listener */
499         {"MSALL",          0, 10},      /* Set multi MSN listeners */
500         {"SETSIL",         0, 11},      /* Set SI list     */
501         {"SEESIL",         0, 12},      /* Get SI list     */
502         {"SILC",           0, 13},      /* Clear SI list     */
503         {"LOCK",           0, -1},      /* LOCK channel     */
504         {"UNLOCK",         0, -1},      /* UNLOCK channel     */
505         {"FV2ON",          1, 14},      /* Leased mode on               */
506         {"FV2OFF",         1, 15},      /* Leased mode off              */
507         {NULL, 0, -1}
508 };
509 /* *INDENT-ON* */
510
511
512 /*
513  * Simulate an error-response from a card.
514  *
515  * Parameter:
516  *   card = pointer to card struct.
517  */
518 static void
519 isdnloop_fake_err(isdnloop_card * card)
520 {
521         char buf[60];
522
523         sprintf(buf, "E%s", card->omsg);
524         isdnloop_fake(card, buf, -1);
525         isdnloop_fake(card, "NAK", -1);
526 }
527
528 static u_char ctable_eu[] =
529 {0x00, 0x11, 0x01, 0x12};
530 static u_char ctable_1t[] =
531 {0x00, 0x3b, 0x01, 0x3a};
532
533 /*
534  * Assemble a simplified cause message depending on the
535  * D-channel protocol used.
536  *
537  * Parameter:
538  *   card = pointer to card struct.
539  *   loc  = location: 0 = local, 1 = remote.
540  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
541  * Return:
542  *   Pointer to buffer containing the assembled message.
543  */
544 static char *
545 isdnloop_unicause(isdnloop_card * card, int loc, int cau)
546 {
547         static char buf[6];
548
549         switch (card->ptype) {
550                 case ISDN_PTYPE_EURO:
551                         sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
552                         break;
553                 case ISDN_PTYPE_1TR6:
554                         sprintf(buf, "%02X44", ctable_1t[cau]);
555                         break;
556                 default:
557                         return ("0000");
558         }
559         return (buf);
560 }
561
562 /*
563  * Release a virtual connection. Called from timer interrupt, when
564  * called party did not respond.
565  *
566  * Parameter:
567  *   card = pointer to card struct.
568  *   ch   = channel (0-based)
569  */
570 static void
571 isdnloop_atimeout(isdnloop_card * card, int ch)
572 {
573         unsigned long flags;
574         char buf[60];
575
576         spin_lock_irqsave(&card->isdnloop_lock, flags);
577         if (card->rcard) {
578                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
579                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
580                 card->rcard[ch] = NULL;
581         }
582         isdnloop_fake(card, "DDIS_I", ch + 1);
583         /* No user responding */
584         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
585         isdnloop_fake(card, buf, ch + 1);
586         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
587 }
588
589 /*
590  * Wrapper for isdnloop_atimeout().
591  */
592 static void
593 isdnloop_atimeout0(unsigned long data)
594 {
595         isdnloop_card *card = (isdnloop_card *) data;
596         isdnloop_atimeout(card, 0);
597 }
598
599 /*
600  * Wrapper for isdnloop_atimeout().
601  */
602 static void
603 isdnloop_atimeout1(unsigned long data)
604 {
605         isdnloop_card *card = (isdnloop_card *) data;
606         isdnloop_atimeout(card, 1);
607 }
608
609 /*
610  * Install a watchdog for a user, not responding.
611  *
612  * Parameter:
613  *   card = pointer to card struct.
614  *   ch   = channel to watch for.
615  */
616 static void
617 isdnloop_start_ctimer(isdnloop_card * card, int ch)
618 {
619         unsigned long flags;
620
621         spin_lock_irqsave(&card->isdnloop_lock, flags);
622         init_timer(&card->c_timer[ch]);
623         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
624         if (ch)
625                 card->c_timer[ch].function = isdnloop_atimeout1;
626         else
627                 card->c_timer[ch].function = isdnloop_atimeout0;
628         card->c_timer[ch].data = (unsigned long) card;
629         add_timer(&card->c_timer[ch]);
630         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
631 }
632
633 /*
634  * Kill a pending channel watchdog.
635  *
636  * Parameter:
637  *   card = pointer to card struct.
638  *   ch   = channel (0-based).
639  */
640 static void
641 isdnloop_kill_ctimer(isdnloop_card * card, int ch)
642 {
643         unsigned long flags;
644
645         spin_lock_irqsave(&card->isdnloop_lock, flags);
646         del_timer(&card->c_timer[ch]);
647         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
648 }
649
650 static u_char si2bit[] =
651 {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
652 static u_char bit2si[] =
653 {1, 5, 7};
654
655 /*
656  * Try finding a listener for an outgoing call.
657  *
658  * Parameter:
659  *   card = pointer to calling card.
660  *   p    = pointer to ICN-type setup-string.
661  *   lch  = channel of calling card.
662  *   cmd  = pointer to struct to be filled when parsing setup.
663  * Return:
664  *   0 = found match, alerting should happen.
665  *   1 = found matching number but it is busy.
666  *   2 = no matching listener.
667  *   3 = found matching number but SI does not match.
668  */
669 static int
670 isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
671 {
672         isdnloop_card *cc = cards;
673         unsigned long flags;
674         int ch;
675         int num_match;
676         int i;
677         char *e;
678         char nbuf[32];
679
680         isdnloop_parse_setup(p, cmd);
681         while (cc) {
682                 for (ch = 0; ch < 2; ch++) {
683                         /* Exclude ourself */
684                         if ((cc == card) && (ch == lch))
685                                 continue;
686                         num_match = 0;
687                         switch (cc->ptype) {
688                                 case ISDN_PTYPE_EURO:
689                                         for (i = 0; i < 3; i++)
690                                                 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
691                                                         num_match = 1;
692                                         break;
693                                 case ISDN_PTYPE_1TR6:
694                                         e = cc->eazlist[ch];
695                                         while (*e) {
696                                                 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
697                                                 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
698                                                         num_match = 1;
699                                                 e++;
700                                         }
701                         }
702                         if (num_match) {
703                                 spin_lock_irqsave(&card->isdnloop_lock, flags);
704                                 /* channel idle? */
705                                 if (!(cc->rcard[ch])) {
706                                         /* Check SI */
707                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
708                                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
709                                                 return 3;
710                                         }
711                                         /* ch is idle, si and number matches */
712                                         cc->rcard[ch] = card;
713                                         cc->rch[ch] = lch;
714                                         card->rcard[lch] = cc;
715                                         card->rch[lch] = ch;
716                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
717                                         return 0;
718                                 } else {
719                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
720                                         /* num matches, but busy */
721                                         if (ch == 1)
722                                                 return 1;
723                                 }
724                         }
725                 }
726                 cc = cc->next;
727         }
728         return 2;
729 }
730
731 /*
732  * Depending on D-channel protocol and caller/called, modify
733  * phone number.
734  *
735  * Parameter:
736  *   card   = pointer to card struct.
737  *   phone  = pointer phone number.
738  *   caller = flag: 1 = caller, 0 = called.
739  * Return:
740  *   pointer to new phone number.
741  */
742 static char *
743 isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
744 {
745         int i;
746         static char nphone[30];
747
748         if (!card) {
749                 printk("BUG!!!\n");
750                 return "";
751         }
752         switch (card->ptype) {
753                 case ISDN_PTYPE_EURO:
754                         if (caller) {
755                                 for (i = 0; i < 2; i++)
756                                         if (!(strcmp(card->s0num[i], phone)))
757                                                 return (phone);
758                                 return (card->s0num[0]);
759                         }
760                         return (phone);
761                         break;
762                 case ISDN_PTYPE_1TR6:
763                         if (caller) {
764                                 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
765                                 return (nphone);
766                         } else
767                                 return (&phone[strlen(phone) - 1]);
768                         break;
769         }
770         return "";
771 }
772
773 /*
774  * Parse an ICN-type command string sent to the 'card'.
775  * Perform misc. actions depending on the command.
776  *
777  * Parameter:
778  *   card = pointer to card struct.
779  */
780 static void
781 isdnloop_parse_cmd(isdnloop_card * card)
782 {
783         char *p = card->omsg;
784         isdn_ctrl cmd;
785         char buf[60];
786         isdnloop_stat *s = isdnloop_cmd_table;
787         int action = -1;
788         int i;
789         int ch;
790
791         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
792                 isdnloop_fake_err(card);
793                 return;
794         }
795         ch = card->omsg[1] - '0';
796         if ((ch < 0) || (ch > 2)) {
797                 isdnloop_fake_err(card);
798                 return;
799         }
800         p += 3;
801         while (s->statstr) {
802                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
803                         action = s->action;
804                         if (s->command && (ch != 0)) {
805                                 isdnloop_fake_err(card);
806                                 return;
807                         }
808                         break;
809                 }
810                 s++;
811         }
812         if (action == -1)
813                 return;
814         switch (action) {
815                 case 1:
816                         /* 0x;BCON_R */
817                         if (card->rcard[ch - 1]) {
818                                 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
819                                               card->rch[ch - 1] + 1);
820                                 isdnloop_fake(card, "BCON_C", ch);
821                         }
822                         break;
823                 case 17:
824                         /* 0x;BCON_I */
825                         if (card->rcard[ch - 1]) {
826                                 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
827                                               card->rch[ch - 1] + 1);
828                         }
829                         break;
830                 case 2:
831                         /* 0x;BDIS_R */
832                         isdnloop_fake(card, "BDIS_C", ch);
833                         if (card->rcard[ch - 1]) {
834                                 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
835                                               card->rch[ch - 1] + 1);
836                         }
837                         break;
838                 case 16:
839                         /* 0x;DCON_R */
840                         isdnloop_kill_ctimer(card, ch - 1);
841                         if (card->rcard[ch - 1]) {
842                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
843                                 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
844                                               card->rch[ch - 1] + 1);
845                                 isdnloop_fake(card, "DCON_C", ch);
846                         }
847                         break;
848                 case 3:
849                         /* 0x;DDIS_R */
850                         isdnloop_kill_ctimer(card, ch - 1);
851                         if (card->rcard[ch - 1]) {
852                                 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
853                                 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
854                                               card->rch[ch - 1] + 1);
855                                 card->rcard[ch - 1] = NULL;
856                         }
857                         isdnloop_fake(card, "DDIS_C", ch);
858                         break;
859                 case 4:
860                         /* 0x;DSCA_Rdd,yy,zz,oo */
861                         if (card->ptype != ISDN_PTYPE_1TR6) {
862                                 isdnloop_fake_err(card);
863                                 return;
864                         }
865                         /* Fall through */
866                 case 5:
867                         /* 0x;DCAL_Rdd,yy,zz,oo */
868                         p += 6;
869                         switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
870                                 case 0:
871                                         /* Alerting */
872                                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
873                                            (action == 4) ? "SCA" : "CAL",
874                                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
875                                                 cmd.parm.setup.si1,
876                                                 cmd.parm.setup.si2,
877                                         isdnloop_vstphone(card->rcard[ch - 1],
878                                                cmd.parm.setup.phone, 0));
879                                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
880                                         /* Fall through */
881                                 case 3:
882                                         /* si1 does not match, don't alert but start timer */
883                                         isdnloop_start_ctimer(card, ch - 1);
884                                         break;
885                                 case 1:
886                                         /* Remote busy */
887                                         isdnloop_fake(card, "DDIS_I", ch);
888                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
889                                         isdnloop_fake(card, buf, ch);
890                                         break;
891                                 case 2:
892                                         /* No such user */
893                                         isdnloop_fake(card, "DDIS_I", ch);
894                                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
895                                         isdnloop_fake(card, buf, ch);
896                                         break;
897                         }
898                         break;
899                 case 6:
900                         /* 0x;EAZC */
901                         card->eazlist[ch - 1][0] = '\0';
902                         break;
903                 case 7:
904                         /* 0x;EAZ */
905                         p += 3;
906                         strcpy(card->eazlist[ch - 1], p);
907                         break;
908                 case 8:
909                         /* 0x;SEEAZ */
910                         sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
911                         isdnloop_fake(card, buf, ch + 1);
912                         break;
913                 case 9:
914                         /* 0x;MSN */
915                         break;
916                 case 10:
917                         /* 0x;MSNALL */
918                         break;
919                 case 11:
920                         /* 0x;SETSIL */
921                         p += 6;
922                         i = 0;
923                         while (strchr("0157", *p)) {
924                                 if (i)
925                                         card->sil[ch - 1] |= si2bit[*p - '0'];
926                                 i = (*p++ == '0');
927                         }
928                         if (*p)
929                                 isdnloop_fake_err(card);
930                         break;
931                 case 12:
932                         /* 0x;SEESIL */
933                         sprintf(buf, "SIN-LIST: ");
934                         p = buf + 10;
935                         for (i = 0; i < 3; i++)
936                                 if (card->sil[ch - 1] & (1 << i))
937                                         p += sprintf(p, "%02d", bit2si[i]);
938                         isdnloop_fake(card, buf, ch + 1);
939                         break;
940                 case 13:
941                         /* 0x;SILC */
942                         card->sil[ch - 1] = 0;
943                         break;
944                 case 14:
945                         /* 00;FV2ON */
946                         break;
947                 case 15:
948                         /* 00;FV2OFF */
949                         break;
950         }
951 }
952
953 /*
954  * Put command-strings into the of the 'card'. In reality, execute them
955  * right in place by calling isdnloop_parse_cmd(). Also copy every
956  * command to the read message ringbuffer, preceeding it with a '>'.
957  * These mesagges can be read at /dev/isdnctrl.
958  *
959  * Parameter:
960  *   buf  = pointer to command buffer.
961  *   len  = length of buffer data.
962  *   user = flag: 1 = called form userlevel, 0 called from kernel.
963  *   card = pointer to card struct.
964  * Return:
965  *   number of bytes transferred (currently always equals len).
966  */
967 static int
968 isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
969 {
970         int xcount = 0;
971         int ocount = 1;
972         isdn_ctrl cmd;
973
974         while (len) {
975                 int count = len;
976                 u_char *p;
977                 u_char msg[0x100];
978
979                 if (count > 255)
980                         count = 255;
981                 if (user) {
982                         if (copy_from_user(msg, buf, count))
983                                 return -EFAULT;
984                 } else
985                         memcpy(msg, buf, count);
986                 isdnloop_putmsg(card, '>');
987                 for (p = msg; count > 0; count--, p++) {
988                         len--;
989                         xcount++;
990                         isdnloop_putmsg(card, *p);
991                         card->omsg[card->optr] = *p;
992                         if (*p == '\n') {
993                                 card->omsg[card->optr] = '\0';
994                                 card->optr = 0;
995                                 isdnloop_parse_cmd(card);
996                                 if (len) {
997                                         isdnloop_putmsg(card, '>');
998                                         ocount++;
999                                 }
1000                         } else {
1001                                 if (card->optr < 59)
1002                                         card->optr++;
1003                         }
1004                         ocount++;
1005                 }
1006         }
1007         cmd.command = ISDN_STAT_STAVAIL;
1008         cmd.driver = card->myid;
1009         cmd.arg = ocount;
1010         card->interface.statcallb(&cmd);
1011         return xcount;
1012 }
1013
1014 /*
1015  * Delete card's pending timers, send STOP to linklevel
1016  */
1017 static void
1018 isdnloop_stopcard(isdnloop_card * card)
1019 {
1020         unsigned long flags;
1021         isdn_ctrl cmd;
1022
1023         spin_lock_irqsave(&card->isdnloop_lock, flags);
1024         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1025                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1026                 del_timer(&card->st_timer);
1027                 del_timer(&card->rb_timer);
1028                 del_timer(&card->c_timer[0]);
1029                 del_timer(&card->c_timer[1]);
1030                 cmd.command = ISDN_STAT_STOP;
1031                 cmd.driver = card->myid;
1032                 card->interface.statcallb(&cmd);
1033         }
1034         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1035 }
1036
1037 /*
1038  * Stop all cards before unload.
1039  */
1040 static void
1041 isdnloop_stopallcards(void)
1042 {
1043         isdnloop_card *p = cards;
1044
1045         while (p) {
1046                 isdnloop_stopcard(p);
1047                 p = p->next;
1048         }
1049 }
1050
1051 /*
1052  * Start a 'card'. Simulate card's boot message and set the phone
1053  * number(s) of the virtual 'S0-Interface'. Install D-channel
1054  * poll timer.
1055  *
1056  * Parameter:
1057  *   card  = pointer to card struct.
1058  *   sdefp = pointer to struct holding ioctl parameters.
1059  * Return:
1060  *   0 on success, -E??? otherwise.
1061  */
1062 static int
1063 isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
1064 {
1065         unsigned long flags;
1066         isdnloop_sdef sdef;
1067         int i;
1068
1069         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1070                 return -EBUSY;
1071         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1072                 return -EFAULT;
1073         spin_lock_irqsave(&card->isdnloop_lock, flags);
1074         switch (sdef.ptype) {
1075                 case ISDN_PTYPE_EURO:
1076                         if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1077                                           -1)) {
1078                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1079                                 return -ENOMEM;
1080                         }
1081                         card->sil[0] = card->sil[1] = 4;
1082                         if (isdnloop_fake(card, "TEI OK", 0)) {
1083                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1084                                 return -ENOMEM;
1085                         }
1086                         for (i = 0; i < 3; i++)
1087                                 strcpy(card->s0num[i], sdef.num[i]);
1088                         break;
1089                 case ISDN_PTYPE_1TR6:
1090                         if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1091                                           -1)) {
1092                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1093                                 return -ENOMEM;
1094                         }
1095                         card->sil[0] = card->sil[1] = 4;
1096                         if (isdnloop_fake(card, "TEI OK", 0)) {
1097                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1098                                 return -ENOMEM;
1099                         }
1100                         strcpy(card->s0num[0], sdef.num[0]);
1101                         card->s0num[1][0] = '\0';
1102                         card->s0num[2][0] = '\0';
1103                         break;
1104                 default:
1105                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1106                         printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1107                                sdef.ptype);
1108                         return -EINVAL;
1109         }
1110         init_timer(&card->st_timer);
1111         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1112         card->st_timer.function = isdnloop_polldchan;
1113         card->st_timer.data = (unsigned long) card;
1114         add_timer(&card->st_timer);
1115         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1116         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1117         return 0;
1118 }
1119
1120 /*
1121  * Main handler for commands sent by linklevel.
1122  */
1123 static int
1124 isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
1125 {
1126         ulong a;
1127         int i;
1128         char cbuf[60];
1129         isdn_ctrl cmd;
1130         isdnloop_cdef cdef;
1131
1132         switch (c->command) {
1133                 case ISDN_CMD_IOCTL:
1134                         memcpy(&a, c->parm.num, sizeof(ulong));
1135                         switch (c->arg) {
1136                                 case ISDNLOOP_IOCTL_DEBUGVAR:
1137                                         return (ulong) card;
1138                                 case ISDNLOOP_IOCTL_STARTUP:
1139                                         if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1140                                                 return -EFAULT;
1141                                         return (isdnloop_start(card, (isdnloop_sdef *) a));
1142                                         break;
1143                                 case ISDNLOOP_IOCTL_ADDCARD:
1144                                         if (copy_from_user((char *)&cdef,
1145                                                            (char *)a,
1146                                                            sizeof(cdef)))
1147                                                 return -EFAULT;
1148                                         return (isdnloop_addcard(cdef.id1));
1149                                         break;
1150                                 case ISDNLOOP_IOCTL_LEASEDCFG:
1151                                         if (a) {
1152                                                 if (!card->leased) {
1153                                                         card->leased = 1;
1154                                                         while (card->ptype == ISDN_PTYPE_UNKNOWN)
1155                                                                 schedule_timeout_interruptible(10);
1156                                                         schedule_timeout_interruptible(10);
1157                                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1158                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1159                                                         printk(KERN_INFO
1160                                                                "isdnloop: (%s) Leased-line mode enabled\n",
1161                                                                CID);
1162                                                         cmd.command = ISDN_STAT_RUN;
1163                                                         cmd.driver = card->myid;
1164                                                         cmd.arg = 0;
1165                                                         card->interface.statcallb(&cmd);
1166                                                 }
1167                                         } else {
1168                                                 if (card->leased) {
1169                                                         card->leased = 0;
1170                                                         sprintf(cbuf, "00;FV2OFF\n");
1171                                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1172                                                         printk(KERN_INFO
1173                                                                "isdnloop: (%s) Leased-line mode disabled\n",
1174                                                                CID);
1175                                                         cmd.command = ISDN_STAT_RUN;
1176                                                         cmd.driver = card->myid;
1177                                                         cmd.arg = 0;
1178                                                         card->interface.statcallb(&cmd);
1179                                                 }
1180                                         }
1181                                         return 0;
1182                                 default:
1183                                         return -EINVAL;
1184                         }
1185                         break;
1186                 case ISDN_CMD_DIAL:
1187                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1188                                 return -ENODEV;
1189                         if (card->leased)
1190                                 break;
1191                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1192                                 char *p;
1193                                 char dial[50];
1194                                 char dcode[4];
1195
1196                                 a = c->arg;
1197                                 p = c->parm.setup.phone;
1198                                 if (*p == 's' || *p == 'S') {
1199                                         /* Dial for SPV */
1200                                         p++;
1201                                         strcpy(dcode, "SCA");
1202                                 } else
1203                                         /* Normal Dial */
1204                                         strcpy(dcode, "CAL");
1205                                 strcpy(dial, p);
1206                                 sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1207                                         dcode, dial, c->parm.setup.si1,
1208                                 c->parm.setup.si2, c->parm.setup.eazmsn);
1209                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1210                         }
1211                         break;
1212                 case ISDN_CMD_ACCEPTD:
1213                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1214                                 return -ENODEV;
1215                         if (c->arg < ISDNLOOP_BCH) {
1216                                 a = c->arg + 1;
1217                                 cbuf[0] = 0;
1218                                 switch (card->l2_proto[a - 1]) {
1219                                         case ISDN_PROTO_L2_X75I:
1220                                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1221                                                 break;
1222 #ifdef CONFIG_ISDN_X25
1223                                         case ISDN_PROTO_L2_X25DTE:
1224                                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1225                                                 break;
1226                                         case ISDN_PROTO_L2_X25DCE:
1227                                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1228                                                 break;
1229 #endif
1230                                         case ISDN_PROTO_L2_HDLC:
1231                                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1232                                                 break;
1233                                 }
1234                                 if (strlen(cbuf))
1235                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1236                                 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1237                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1238                         }
1239                         break;
1240                 case ISDN_CMD_ACCEPTB:
1241                         if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1242                                 return -ENODEV;
1243                         if (c->arg < ISDNLOOP_BCH) {
1244                                 a = c->arg + 1;
1245                                 switch (card->l2_proto[a - 1]) {
1246                                         case ISDN_PROTO_L2_X75I:
1247                                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1248                                                 break;
1249 #ifdef CONFIG_ISDN_X25
1250                                         case ISDN_PROTO_L2_X25DTE:
1251                                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1252                                                 break;
1253                                         case ISDN_PROTO_L2_X25DCE:
1254                                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1255                                                 break;
1256 #endif
1257                                         case ISDN_PROTO_L2_HDLC:
1258                                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1259                                                 break;
1260                                         default:
1261                                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1262                                 }
1263                                 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1264                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1265                                 break;
1266                 case ISDN_CMD_HANGUP:
1267                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1268                                         return -ENODEV;
1269                                 if (c->arg < ISDNLOOP_BCH) {
1270                                         a = c->arg + 1;
1271                                         sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1272                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1273                                 }
1274                                 break;
1275                 case ISDN_CMD_SETEAZ:
1276                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1277                                         return -ENODEV;
1278                                 if (card->leased)
1279                                         break;
1280                                 if (c->arg < ISDNLOOP_BCH) {
1281                                         a = c->arg + 1;
1282                                         if (card->ptype == ISDN_PTYPE_EURO) {
1283                                                 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1284                                                         c->parm.num[0] ? "N" : "ALL", c->parm.num);
1285                                         } else
1286                                                 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1287                                                         c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1288                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1289                                 }
1290                                 break;
1291                 case ISDN_CMD_CLREAZ:
1292                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1293                                         return -ENODEV;
1294                                 if (card->leased)
1295                                         break;
1296                                 if (c->arg < ISDNLOOP_BCH) {
1297                                         a = c->arg + 1;
1298                                         if (card->ptype == ISDN_PTYPE_EURO)
1299                                                 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1300                                         else
1301                                                 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1302                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1303                                 }
1304                                 break;
1305                 case ISDN_CMD_SETL2:
1306                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1307                                         return -ENODEV;
1308                                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1309                                         a = c->arg;
1310                                         switch (a >> 8) {
1311                                                 case ISDN_PROTO_L2_X75I:
1312                                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1313                                                         break;
1314 #ifdef CONFIG_ISDN_X25
1315                                                 case ISDN_PROTO_L2_X25DTE:
1316                                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1317                                                         break;
1318                                                 case ISDN_PROTO_L2_X25DCE:
1319                                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1320                                                         break;
1321 #endif
1322                                                 case ISDN_PROTO_L2_HDLC:
1323                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1324                                                         break;
1325                                                 case ISDN_PROTO_L2_TRANS:
1326                                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1327                                                         break;
1328                                                 default:
1329                                                         return -EINVAL;
1330                                         }
1331                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1332                                         card->l2_proto[a & 255] = (a >> 8);
1333                                 }
1334                                 break;
1335                 case ISDN_CMD_SETL3:
1336                                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1337                                         return -ENODEV;
1338                                 return 0;
1339                 default:
1340                                 return -EINVAL;
1341                         }
1342         }
1343         return 0;
1344 }
1345
1346 /*
1347  * Find card with given driverId
1348  */
1349 static inline isdnloop_card *
1350 isdnloop_findcard(int driverid)
1351 {
1352         isdnloop_card *p = cards;
1353
1354         while (p) {
1355                 if (p->myid == driverid)
1356                         return p;
1357                 p = p->next;
1358         }
1359         return (isdnloop_card *) 0;
1360 }
1361
1362 /*
1363  * Wrapper functions for interface to linklevel
1364  */
1365 static int
1366 if_command(isdn_ctrl * c)
1367 {
1368         isdnloop_card *card = isdnloop_findcard(c->driver);
1369
1370         if (card)
1371                 return (isdnloop_command(c, card));
1372         printk(KERN_ERR
1373                "isdnloop: if_command called with invalid driverId!\n");
1374         return -ENODEV;
1375 }
1376
1377 static int
1378 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1379 {
1380         isdnloop_card *card = isdnloop_findcard(id);
1381
1382         if (card) {
1383                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1384                         return -ENODEV;
1385                 return (isdnloop_writecmd(buf, len, 1, card));
1386         }
1387         printk(KERN_ERR
1388                "isdnloop: if_writecmd called with invalid driverId!\n");
1389         return -ENODEV;
1390 }
1391
1392 static int
1393 if_readstatus(u_char __user *buf, int len, int id, int channel)
1394 {
1395         isdnloop_card *card = isdnloop_findcard(id);
1396
1397         if (card) {
1398                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1399                         return -ENODEV;
1400                 return (isdnloop_readstatus(buf, len, card));
1401         }
1402         printk(KERN_ERR
1403                "isdnloop: if_readstatus called with invalid driverId!\n");
1404         return -ENODEV;
1405 }
1406
1407 static int
1408 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1409 {
1410         isdnloop_card *card = isdnloop_findcard(id);
1411
1412         if (card) {
1413                 if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
1414                         return -ENODEV;
1415                 /* ack request stored in skb scratch area */
1416                 *(skb->head) = ack;
1417                 return (isdnloop_sendbuf(channel, skb, card));
1418         }
1419         printk(KERN_ERR
1420                "isdnloop: if_sendbuf called with invalid driverId!\n");
1421         return -ENODEV;
1422 }
1423
1424 /*
1425  * Allocate a new card-struct, initialize it
1426  * link it into cards-list and register it at linklevel.
1427  */
1428 static isdnloop_card *
1429 isdnloop_initcard(char *id)
1430 {
1431         isdnloop_card *card;
1432         int i;
1433
1434         if (!(card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
1435                 printk(KERN_WARNING
1436                  "isdnloop: (%s) Could not allocate card-struct.\n", id);
1437                 return (isdnloop_card *) 0;
1438         }
1439         card->interface.owner = THIS_MODULE;
1440         card->interface.channels = ISDNLOOP_BCH;
1441         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/ 
1442         card->interface.maxbufsize = 4000;
1443         card->interface.command = if_command;
1444         card->interface.writebuf_skb = if_sendbuf;
1445         card->interface.writecmd = if_writecmd;
1446         card->interface.readstat = if_readstatus;
1447         card->interface.features = ISDN_FEATURE_L2_X75I |
1448 #ifdef CONFIG_ISDN_X25
1449             ISDN_FEATURE_L2_X25DTE |
1450             ISDN_FEATURE_L2_X25DCE |
1451 #endif
1452             ISDN_FEATURE_L2_HDLC |
1453             ISDN_FEATURE_L3_TRANS |
1454             ISDN_FEATURE_P_UNKNOWN;
1455         card->ptype = ISDN_PTYPE_UNKNOWN;
1456         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1457         card->msg_buf_write = card->msg_buf;
1458         card->msg_buf_read = card->msg_buf;
1459         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1460         for (i = 0; i < ISDNLOOP_BCH; i++) {
1461                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1462                 skb_queue_head_init(&card->bqueue[i]);
1463         }
1464         skb_queue_head_init(&card->dqueue);
1465         card->isdnloop_lock = SPIN_LOCK_UNLOCKED;
1466         card->next = cards;
1467         cards = card;
1468         if (!register_isdn(&card->interface)) {
1469                 cards = cards->next;
1470                 printk(KERN_WARNING
1471                        "isdnloop: Unable to register %s\n", id);
1472                 kfree(card);
1473                 return (isdnloop_card *) 0;
1474         }
1475         card->myid = card->interface.channels;
1476         return card;
1477 }
1478
1479 static int
1480 isdnloop_addcard(char *id1)
1481 {
1482         isdnloop_card *card;
1483
1484         if (!(card = isdnloop_initcard(id1))) {
1485                 return -EIO;
1486         }
1487         printk(KERN_INFO
1488                "isdnloop: (%s) virtual card added\n",
1489                card->interface.id);
1490         return 0;
1491 }
1492
1493 static int __init
1494 isdnloop_init(void)
1495 {
1496         char *p;
1497         char rev[10];
1498
1499         if ((p = strchr(revision, ':'))) {
1500                 strcpy(rev, p + 1);
1501                 p = strchr(rev, '$');
1502                 *p = 0;
1503         } else
1504                 strcpy(rev, " ??? ");
1505         printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
1506
1507         if (isdnloop_id)
1508                 return (isdnloop_addcard(isdnloop_id));
1509
1510         return 0;
1511 }
1512
1513 static void __exit
1514 isdnloop_exit(void)
1515 {
1516         isdn_ctrl cmd;
1517         isdnloop_card *card = cards;
1518         isdnloop_card *last;
1519         int i;
1520
1521         isdnloop_stopallcards();
1522         while (card) {
1523                 cmd.command = ISDN_STAT_UNLOAD;
1524                 cmd.driver = card->myid;
1525                 card->interface.statcallb(&cmd);
1526                 for (i = 0; i < ISDNLOOP_BCH; i++)
1527                         isdnloop_free_queue(card, i);
1528                 card = card->next;
1529         }
1530         card = cards;
1531         while (card) {
1532                 last = card;
1533                 skb_queue_purge(&card->dqueue);
1534                 card = card->next;
1535                 kfree(last);
1536         }
1537         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1538 }
1539
1540 module_init(isdnloop_init);
1541 module_exit(isdnloop_exit);