Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[firefly-linux-kernel-4.4.55.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 *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                 skb = skb_dequeue(&card->bqueue[ch]);
63                 if (skb) {
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         {"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         skb = skb_dequeue(&card->dqueue);
321         if (skb)
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         skb = dev_alloc_skb(len);
476         if (!skb) {
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         {"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[64];
522
523         snprintf(buf, sizeof(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[] = {0x00, 0x11, 0x01, 0x12};
529 static u_char ctable_1t[] = {0x00, 0x3b, 0x01, 0x3a};
530
531 /*
532  * Assemble a simplified cause message depending on the
533  * D-channel protocol used.
534  *
535  * Parameter:
536  *   card = pointer to card struct.
537  *   loc  = location: 0 = local, 1 = remote.
538  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
539  * Return:
540  *   Pointer to buffer containing the assembled message.
541  */
542 static char *
543 isdnloop_unicause(isdnloop_card *card, int loc, int cau)
544 {
545         static char buf[6];
546
547         switch (card->ptype) {
548         case ISDN_PTYPE_EURO:
549                 sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
550                 break;
551         case ISDN_PTYPE_1TR6:
552                 sprintf(buf, "%02X44", ctable_1t[cau]);
553                 break;
554         default:
555                 return "0000";
556         }
557         return buf;
558 }
559
560 /*
561  * Release a virtual connection. Called from timer interrupt, when
562  * called party did not respond.
563  *
564  * Parameter:
565  *   card = pointer to card struct.
566  *   ch   = channel (0-based)
567  */
568 static void
569 isdnloop_atimeout(isdnloop_card *card, int ch)
570 {
571         unsigned long flags;
572         char buf[60];
573
574         spin_lock_irqsave(&card->isdnloop_lock, flags);
575         if (card->rcard) {
576                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
577                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
578                 card->rcard[ch] = NULL;
579         }
580         isdnloop_fake(card, "DDIS_I", ch + 1);
581         /* No user responding */
582         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
583         isdnloop_fake(card, buf, ch + 1);
584         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
585 }
586
587 /*
588  * Wrapper for isdnloop_atimeout().
589  */
590 static void
591 isdnloop_atimeout0(unsigned long data)
592 {
593         isdnloop_card *card = (isdnloop_card *) data;
594         isdnloop_atimeout(card, 0);
595 }
596
597 /*
598  * Wrapper for isdnloop_atimeout().
599  */
600 static void
601 isdnloop_atimeout1(unsigned long data)
602 {
603         isdnloop_card *card = (isdnloop_card *) data;
604         isdnloop_atimeout(card, 1);
605 }
606
607 /*
608  * Install a watchdog for a user, not responding.
609  *
610  * Parameter:
611  *   card = pointer to card struct.
612  *   ch   = channel to watch for.
613  */
614 static void
615 isdnloop_start_ctimer(isdnloop_card *card, int ch)
616 {
617         unsigned long flags;
618
619         spin_lock_irqsave(&card->isdnloop_lock, flags);
620         init_timer(&card->c_timer[ch]);
621         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
622         if (ch)
623                 card->c_timer[ch].function = isdnloop_atimeout1;
624         else
625                 card->c_timer[ch].function = isdnloop_atimeout0;
626         card->c_timer[ch].data = (unsigned long) card;
627         add_timer(&card->c_timer[ch]);
628         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
629 }
630
631 /*
632  * Kill a pending channel watchdog.
633  *
634  * Parameter:
635  *   card = pointer to card struct.
636  *   ch   = channel (0-based).
637  */
638 static void
639 isdnloop_kill_ctimer(isdnloop_card *card, int ch)
640 {
641         unsigned long flags;
642
643         spin_lock_irqsave(&card->isdnloop_lock, flags);
644         del_timer(&card->c_timer[ch]);
645         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
646 }
647
648 static u_char si2bit[] = {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
649 static u_char bit2si[] = {1, 5, 7};
650
651 /*
652  * Try finding a listener for an outgoing call.
653  *
654  * Parameter:
655  *   card = pointer to calling card.
656  *   p    = pointer to ICN-type setup-string.
657  *   lch  = channel of calling card.
658  *   cmd  = pointer to struct to be filled when parsing setup.
659  * Return:
660  *   0 = found match, alerting should happen.
661  *   1 = found matching number but it is busy.
662  *   2 = no matching listener.
663  *   3 = found matching number but SI does not match.
664  */
665 static int
666 isdnloop_try_call(isdnloop_card *card, char *p, int lch, isdn_ctrl *cmd)
667 {
668         isdnloop_card *cc = cards;
669         unsigned long flags;
670         int ch;
671         int num_match;
672         int i;
673         char *e;
674         char nbuf[32];
675
676         isdnloop_parse_setup(p, cmd);
677         while (cc) {
678                 for (ch = 0; ch < 2; ch++) {
679                         /* Exclude ourself */
680                         if ((cc == card) && (ch == lch))
681                                 continue;
682                         num_match = 0;
683                         switch (cc->ptype) {
684                         case ISDN_PTYPE_EURO:
685                                 for (i = 0; i < 3; i++)
686                                         if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
687                                                 num_match = 1;
688                                 break;
689                         case ISDN_PTYPE_1TR6:
690                                 e = cc->eazlist[ch];
691                                 while (*e) {
692                                         sprintf(nbuf, "%s%c", cc->s0num[0], *e);
693                                         if (!(strcmp(nbuf, cmd->parm.setup.phone)))
694                                                 num_match = 1;
695                                         e++;
696                                 }
697                         }
698                         if (num_match) {
699                                 spin_lock_irqsave(&card->isdnloop_lock, flags);
700                                 /* channel idle? */
701                                 if (!(cc->rcard[ch])) {
702                                         /* Check SI */
703                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
704                                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
705                                                 return 3;
706                                         }
707                                         /* ch is idle, si and number matches */
708                                         cc->rcard[ch] = card;
709                                         cc->rch[ch] = lch;
710                                         card->rcard[lch] = cc;
711                                         card->rch[lch] = ch;
712                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
713                                         return 0;
714                                 } else {
715                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
716                                         /* num matches, but busy */
717                                         if (ch == 1)
718                                                 return 1;
719                                 }
720                         }
721                 }
722                 cc = cc->next;
723         }
724         return 2;
725 }
726
727 /*
728  * Depending on D-channel protocol and caller/called, modify
729  * phone number.
730  *
731  * Parameter:
732  *   card   = pointer to card struct.
733  *   phone  = pointer phone number.
734  *   caller = flag: 1 = caller, 0 = called.
735  * Return:
736  *   pointer to new phone number.
737  */
738 static char *
739 isdnloop_vstphone(isdnloop_card *card, char *phone, int caller)
740 {
741         int i;
742         static char nphone[30];
743
744         if (!card) {
745                 printk("BUG!!!\n");
746                 return "";
747         }
748         switch (card->ptype) {
749         case ISDN_PTYPE_EURO:
750                 if (caller) {
751                         for (i = 0; i < 2; i++)
752                                 if (!(strcmp(card->s0num[i], phone)))
753                                         return phone;
754                         return card->s0num[0];
755                 }
756                 return phone;
757                 break;
758         case ISDN_PTYPE_1TR6:
759                 if (caller) {
760                         sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
761                         return nphone;
762                 } else
763                         return &phone[strlen(phone) - 1];
764                 break;
765         }
766         return "";
767 }
768
769 /*
770  * Parse an ICN-type command string sent to the 'card'.
771  * Perform misc. actions depending on the command.
772  *
773  * Parameter:
774  *   card = pointer to card struct.
775  */
776 static void
777 isdnloop_parse_cmd(isdnloop_card *card)
778 {
779         char *p = card->omsg;
780         isdn_ctrl cmd;
781         char buf[60];
782         isdnloop_stat *s = isdnloop_cmd_table;
783         int action = -1;
784         int i;
785         int ch;
786
787         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
788                 isdnloop_fake_err(card);
789                 return;
790         }
791         ch = card->omsg[1] - '0';
792         if ((ch < 0) || (ch > 2)) {
793                 isdnloop_fake_err(card);
794                 return;
795         }
796         p += 3;
797         while (s->statstr) {
798                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
799                         action = s->action;
800                         if (s->command && (ch != 0)) {
801                                 isdnloop_fake_err(card);
802                                 return;
803                         }
804                         break;
805                 }
806                 s++;
807         }
808         if (action == -1)
809                 return;
810         switch (action) {
811         case 1:
812                 /* 0x;BCON_R */
813                 if (card->rcard[ch - 1]) {
814                         isdnloop_fake(card->rcard[ch - 1], "BCON_I",
815                                       card->rch[ch - 1] + 1);
816                         isdnloop_fake(card, "BCON_C", ch);
817                 }
818                 break;
819         case 17:
820                 /* 0x;BCON_I */
821                 if (card->rcard[ch - 1]) {
822                         isdnloop_fake(card->rcard[ch - 1], "BCON_C",
823                                       card->rch[ch - 1] + 1);
824                 }
825                 break;
826         case 2:
827                 /* 0x;BDIS_R */
828                 isdnloop_fake(card, "BDIS_C", ch);
829                 if (card->rcard[ch - 1]) {
830                         isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
831                                       card->rch[ch - 1] + 1);
832                 }
833                 break;
834         case 16:
835                 /* 0x;DCON_R */
836                 isdnloop_kill_ctimer(card, ch - 1);
837                 if (card->rcard[ch - 1]) {
838                         isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
839                         isdnloop_fake(card->rcard[ch - 1], "DCON_C",
840                                       card->rch[ch - 1] + 1);
841                         isdnloop_fake(card, "DCON_C", ch);
842                 }
843                 break;
844         case 3:
845                 /* 0x;DDIS_R */
846                 isdnloop_kill_ctimer(card, ch - 1);
847                 if (card->rcard[ch - 1]) {
848                         isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
849                         isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
850                                       card->rch[ch - 1] + 1);
851                         card->rcard[ch - 1] = NULL;
852                 }
853                 isdnloop_fake(card, "DDIS_C", ch);
854                 break;
855         case 4:
856                 /* 0x;DSCA_Rdd,yy,zz,oo */
857                 if (card->ptype != ISDN_PTYPE_1TR6) {
858                         isdnloop_fake_err(card);
859                         return;
860                 }
861                 /* Fall through */
862         case 5:
863                 /* 0x;DCAL_Rdd,yy,zz,oo */
864                 p += 6;
865                 switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
866                 case 0:
867                         /* Alerting */
868                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
869                                 (action == 4) ? "SCA" : "CAL",
870                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
871                                 cmd.parm.setup.si1,
872                                 cmd.parm.setup.si2,
873                                 isdnloop_vstphone(card->rcard[ch - 1],
874                                                   cmd.parm.setup.phone, 0));
875                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
876                         /* Fall through */
877                 case 3:
878                         /* si1 does not match, don't alert but start timer */
879                         isdnloop_start_ctimer(card, ch - 1);
880                         break;
881                 case 1:
882                         /* Remote busy */
883                         isdnloop_fake(card, "DDIS_I", ch);
884                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
885                         isdnloop_fake(card, buf, ch);
886                         break;
887                 case 2:
888                         /* No such user */
889                         isdnloop_fake(card, "DDIS_I", ch);
890                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
891                         isdnloop_fake(card, buf, ch);
892                         break;
893                 }
894                 break;
895         case 6:
896                 /* 0x;EAZC */
897                 card->eazlist[ch - 1][0] = '\0';
898                 break;
899         case 7:
900                 /* 0x;EAZ */
901                 p += 3;
902                 if (strlen(p) >= sizeof(card->eazlist[0]))
903                         break;
904                 strcpy(card->eazlist[ch - 1], p);
905                 break;
906         case 8:
907                 /* 0x;SEEAZ */
908                 sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
909                 isdnloop_fake(card, buf, ch + 1);
910                 break;
911         case 9:
912                 /* 0x;MSN */
913                 break;
914         case 10:
915                 /* 0x;MSNALL */
916                 break;
917         case 11:
918                 /* 0x;SETSIL */
919                 p += 6;
920                 i = 0;
921                 while (strchr("0157", *p)) {
922                         if (i)
923                                 card->sil[ch - 1] |= si2bit[*p - '0'];
924                         i = (*p++ == '0');
925                 }
926                 if (*p)
927                         isdnloop_fake_err(card);
928                 break;
929         case 12:
930                 /* 0x;SEESIL */
931                 sprintf(buf, "SIN-LIST: ");
932                 p = buf + 10;
933                 for (i = 0; i < 3; i++)
934                         if (card->sil[ch - 1] & (1 << i))
935                                 p += sprintf(p, "%02d", bit2si[i]);
936                 isdnloop_fake(card, buf, ch + 1);
937                 break;
938         case 13:
939                 /* 0x;SILC */
940                 card->sil[ch - 1] = 0;
941                 break;
942         case 14:
943                 /* 00;FV2ON */
944                 break;
945         case 15:
946                 /* 00;FV2OFF */
947                 break;
948         }
949 }
950
951 /*
952  * Put command-strings into the of the 'card'. In reality, execute them
953  * right in place by calling isdnloop_parse_cmd(). Also copy every
954  * command to the read message ringbuffer, preceding it with a '>'.
955  * These mesagges can be read at /dev/isdnctrl.
956  *
957  * Parameter:
958  *   buf  = pointer to command buffer.
959  *   len  = length of buffer data.
960  *   user = flag: 1 = called form userlevel, 0 called from kernel.
961  *   card = pointer to card struct.
962  * Return:
963  *   number of bytes transferred (currently always equals len).
964  */
965 static int
966 isdnloop_writecmd(const u_char *buf, int len, int user, isdnloop_card *card)
967 {
968         int xcount = 0;
969         int ocount = 1;
970         isdn_ctrl cmd;
971
972         while (len) {
973                 int count = len;
974                 u_char *p;
975                 u_char msg[0x100];
976
977                 if (count > 255)
978                         count = 255;
979                 if (user) {
980                         if (copy_from_user(msg, buf, count))
981                                 return -EFAULT;
982                 } else
983                         memcpy(msg, buf, count);
984                 isdnloop_putmsg(card, '>');
985                 for (p = msg; count > 0; count--, p++) {
986                         len--;
987                         xcount++;
988                         isdnloop_putmsg(card, *p);
989                         card->omsg[card->optr] = *p;
990                         if (*p == '\n') {
991                                 card->omsg[card->optr] = '\0';
992                                 card->optr = 0;
993                                 isdnloop_parse_cmd(card);
994                                 if (len) {
995                                         isdnloop_putmsg(card, '>');
996                                         ocount++;
997                                 }
998                         } else {
999                                 if (card->optr < 59)
1000                                         card->optr++;
1001                         }
1002                         ocount++;
1003                 }
1004         }
1005         cmd.command = ISDN_STAT_STAVAIL;
1006         cmd.driver = card->myid;
1007         cmd.arg = ocount;
1008         card->interface.statcallb(&cmd);
1009         return xcount;
1010 }
1011
1012 /*
1013  * Delete card's pending timers, send STOP to linklevel
1014  */
1015 static void
1016 isdnloop_stopcard(isdnloop_card *card)
1017 {
1018         unsigned long flags;
1019         isdn_ctrl cmd;
1020
1021         spin_lock_irqsave(&card->isdnloop_lock, flags);
1022         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1023                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1024                 del_timer(&card->st_timer);
1025                 del_timer(&card->rb_timer);
1026                 del_timer(&card->c_timer[0]);
1027                 del_timer(&card->c_timer[1]);
1028                 cmd.command = ISDN_STAT_STOP;
1029                 cmd.driver = card->myid;
1030                 card->interface.statcallb(&cmd);
1031         }
1032         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1033 }
1034
1035 /*
1036  * Stop all cards before unload.
1037  */
1038 static void
1039 isdnloop_stopallcards(void)
1040 {
1041         isdnloop_card *p = cards;
1042
1043         while (p) {
1044                 isdnloop_stopcard(p);
1045                 p = p->next;
1046         }
1047 }
1048
1049 /*
1050  * Start a 'card'. Simulate card's boot message and set the phone
1051  * number(s) of the virtual 'S0-Interface'. Install D-channel
1052  * poll timer.
1053  *
1054  * Parameter:
1055  *   card  = pointer to card struct.
1056  *   sdefp = pointer to struct holding ioctl parameters.
1057  * Return:
1058  *   0 on success, -E??? otherwise.
1059  */
1060 static int
1061 isdnloop_start(isdnloop_card *card, isdnloop_sdef *sdefp)
1062 {
1063         unsigned long flags;
1064         isdnloop_sdef sdef;
1065         int i;
1066
1067         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1068                 return -EBUSY;
1069         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1070                 return -EFAULT;
1071
1072         for (i = 0; i < 3; i++) {
1073                 if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
1074                         return -EINVAL;
1075         }
1076
1077         spin_lock_irqsave(&card->isdnloop_lock, flags);
1078         switch (sdef.ptype) {
1079         case ISDN_PTYPE_EURO:
1080                 if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1081                                   -1)) {
1082                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1083                         return -ENOMEM;
1084                 }
1085                 card->sil[0] = card->sil[1] = 4;
1086                 if (isdnloop_fake(card, "TEI OK", 0)) {
1087                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1088                         return -ENOMEM;
1089                 }
1090                 for (i = 0; i < 3; i++) {
1091                         strlcpy(card->s0num[i], sdef.num[i],
1092                                 sizeof(card->s0num[0]));
1093                 }
1094                 break;
1095         case ISDN_PTYPE_1TR6:
1096                 if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1097                                   -1)) {
1098                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1099                         return -ENOMEM;
1100                 }
1101                 card->sil[0] = card->sil[1] = 4;
1102                 if (isdnloop_fake(card, "TEI OK", 0)) {
1103                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1104                         return -ENOMEM;
1105                 }
1106                 strlcpy(card->s0num[0], sdef.num[0], sizeof(card->s0num[0]));
1107                 card->s0num[1][0] = '\0';
1108                 card->s0num[2][0] = '\0';
1109                 break;
1110         default:
1111                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1112                 printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1113                        sdef.ptype);
1114                 return -EINVAL;
1115         }
1116         init_timer(&card->st_timer);
1117         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1118         card->st_timer.function = isdnloop_polldchan;
1119         card->st_timer.data = (unsigned long) card;
1120         add_timer(&card->st_timer);
1121         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1122         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1123         return 0;
1124 }
1125
1126 /*
1127  * Main handler for commands sent by linklevel.
1128  */
1129 static int
1130 isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
1131 {
1132         ulong a;
1133         int i;
1134         char cbuf[80];
1135         isdn_ctrl cmd;
1136         isdnloop_cdef cdef;
1137
1138         switch (c->command) {
1139         case ISDN_CMD_IOCTL:
1140                 memcpy(&a, c->parm.num, sizeof(ulong));
1141                 switch (c->arg) {
1142                 case ISDNLOOP_IOCTL_DEBUGVAR:
1143                         return (ulong) card;
1144                 case ISDNLOOP_IOCTL_STARTUP:
1145                         if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1146                                 return -EFAULT;
1147                         return isdnloop_start(card, (isdnloop_sdef *) a);
1148                         break;
1149                 case ISDNLOOP_IOCTL_ADDCARD:
1150                         if (copy_from_user((char *)&cdef,
1151                                            (char *)a,
1152                                            sizeof(cdef)))
1153                                 return -EFAULT;
1154                         return isdnloop_addcard(cdef.id1);
1155                         break;
1156                 case ISDNLOOP_IOCTL_LEASEDCFG:
1157                         if (a) {
1158                                 if (!card->leased) {
1159                                         card->leased = 1;
1160                                         while (card->ptype == ISDN_PTYPE_UNKNOWN)
1161                                                 schedule_timeout_interruptible(10);
1162                                         schedule_timeout_interruptible(10);
1163                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1164                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1165                                         printk(KERN_INFO
1166                                                "isdnloop: (%s) Leased-line mode enabled\n",
1167                                                CID);
1168                                         cmd.command = ISDN_STAT_RUN;
1169                                         cmd.driver = card->myid;
1170                                         cmd.arg = 0;
1171                                         card->interface.statcallb(&cmd);
1172                                 }
1173                         } else {
1174                                 if (card->leased) {
1175                                         card->leased = 0;
1176                                         sprintf(cbuf, "00;FV2OFF\n");
1177                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1178                                         printk(KERN_INFO
1179                                                "isdnloop: (%s) Leased-line mode disabled\n",
1180                                                CID);
1181                                         cmd.command = ISDN_STAT_RUN;
1182                                         cmd.driver = card->myid;
1183                                         cmd.arg = 0;
1184                                         card->interface.statcallb(&cmd);
1185                                 }
1186                         }
1187                         return 0;
1188                 default:
1189                         return -EINVAL;
1190                 }
1191                 break;
1192         case ISDN_CMD_DIAL:
1193                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1194                         return -ENODEV;
1195                 if (card->leased)
1196                         break;
1197                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1198                         char *p;
1199                         char dcode[4];
1200
1201                         a = c->arg;
1202                         p = c->parm.setup.phone;
1203                         if (*p == 's' || *p == 'S') {
1204                                 /* Dial for SPV */
1205                                 p++;
1206                                 strcpy(dcode, "SCA");
1207                         } else
1208                                 /* Normal Dial */
1209                                 strcpy(dcode, "CAL");
1210                         snprintf(cbuf, sizeof(cbuf),
1211                                  "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1212                                  dcode, p, c->parm.setup.si1,
1213                                  c->parm.setup.si2, c->parm.setup.eazmsn);
1214                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1215                 }
1216                 break;
1217         case ISDN_CMD_ACCEPTD:
1218                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1219                         return -ENODEV;
1220                 if (c->arg < ISDNLOOP_BCH) {
1221                         a = c->arg + 1;
1222                         cbuf[0] = 0;
1223                         switch (card->l2_proto[a - 1]) {
1224                         case ISDN_PROTO_L2_X75I:
1225                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1226                                 break;
1227 #ifdef CONFIG_ISDN_X25
1228                         case ISDN_PROTO_L2_X25DTE:
1229                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1230                                 break;
1231                         case ISDN_PROTO_L2_X25DCE:
1232                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1233                                 break;
1234 #endif
1235                         case ISDN_PROTO_L2_HDLC:
1236                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1237                                 break;
1238                         }
1239                         if (strlen(cbuf))
1240                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1241                         sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1242                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1243                 }
1244                 break;
1245         case ISDN_CMD_ACCEPTB:
1246                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1247                         return -ENODEV;
1248                 if (c->arg < ISDNLOOP_BCH) {
1249                         a = c->arg + 1;
1250                         switch (card->l2_proto[a - 1]) {
1251                         case ISDN_PROTO_L2_X75I:
1252                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1253                                 break;
1254 #ifdef CONFIG_ISDN_X25
1255                         case ISDN_PROTO_L2_X25DTE:
1256                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1257                                 break;
1258                         case ISDN_PROTO_L2_X25DCE:
1259                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1260                                 break;
1261 #endif
1262                         case ISDN_PROTO_L2_HDLC:
1263                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1264                                 break;
1265                         default:
1266                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1267                         }
1268                         printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1269                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1270                         break;
1271                 case ISDN_CMD_HANGUP:
1272                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1273                                 return -ENODEV;
1274                         if (c->arg < ISDNLOOP_BCH) {
1275                                 a = c->arg + 1;
1276                                 sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1277                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1278                         }
1279                         break;
1280                 case ISDN_CMD_SETEAZ:
1281                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1282                                 return -ENODEV;
1283                         if (card->leased)
1284                                 break;
1285                         if (c->arg < ISDNLOOP_BCH) {
1286                                 a = c->arg + 1;
1287                                 if (card->ptype == ISDN_PTYPE_EURO) {
1288                                         sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1289                                                 c->parm.num[0] ? "N" : "ALL", c->parm.num);
1290                                 } else
1291                                         sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1292                                                 c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1293                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1294                         }
1295                         break;
1296                 case ISDN_CMD_CLREAZ:
1297                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1298                                 return -ENODEV;
1299                         if (card->leased)
1300                                 break;
1301                         if (c->arg < ISDNLOOP_BCH) {
1302                                 a = c->arg + 1;
1303                                 if (card->ptype == ISDN_PTYPE_EURO)
1304                                         sprintf(cbuf, "%02d;MSNC\n", (int) a);
1305                                 else
1306                                         sprintf(cbuf, "%02d;EAZC\n", (int) a);
1307                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1308                         }
1309                         break;
1310                 case ISDN_CMD_SETL2:
1311                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1312                                 return -ENODEV;
1313                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1314                                 a = c->arg;
1315                                 switch (a >> 8) {
1316                                 case ISDN_PROTO_L2_X75I:
1317                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1318                                         break;
1319 #ifdef CONFIG_ISDN_X25
1320                                 case ISDN_PROTO_L2_X25DTE:
1321                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1322                                         break;
1323                                 case ISDN_PROTO_L2_X25DCE:
1324                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1325                                         break;
1326 #endif
1327                                 case ISDN_PROTO_L2_HDLC:
1328                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1329                                         break;
1330                                 case ISDN_PROTO_L2_TRANS:
1331                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1332                                         break;
1333                                 default:
1334                                         return -EINVAL;
1335                                 }
1336                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1337                                 card->l2_proto[a & 255] = (a >> 8);
1338                         }
1339                         break;
1340                 case ISDN_CMD_SETL3:
1341                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1342                                 return -ENODEV;
1343                         return 0;
1344                 default:
1345                         return -EINVAL;
1346                 }
1347         }
1348         return 0;
1349 }
1350
1351 /*
1352  * Find card with given driverId
1353  */
1354 static inline isdnloop_card *
1355 isdnloop_findcard(int driverid)
1356 {
1357         isdnloop_card *p = cards;
1358
1359         while (p) {
1360                 if (p->myid == driverid)
1361                         return p;
1362                 p = p->next;
1363         }
1364         return (isdnloop_card *) 0;
1365 }
1366
1367 /*
1368  * Wrapper functions for interface to linklevel
1369  */
1370 static int
1371 if_command(isdn_ctrl *c)
1372 {
1373         isdnloop_card *card = isdnloop_findcard(c->driver);
1374
1375         if (card)
1376                 return isdnloop_command(c, card);
1377         printk(KERN_ERR
1378                "isdnloop: if_command called with invalid driverId!\n");
1379         return -ENODEV;
1380 }
1381
1382 static int
1383 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1384 {
1385         isdnloop_card *card = isdnloop_findcard(id);
1386
1387         if (card) {
1388                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1389                         return -ENODEV;
1390                 return isdnloop_writecmd(buf, len, 1, card);
1391         }
1392         printk(KERN_ERR
1393                "isdnloop: if_writecmd called with invalid driverId!\n");
1394         return -ENODEV;
1395 }
1396
1397 static int
1398 if_readstatus(u_char __user *buf, int len, int id, int channel)
1399 {
1400         isdnloop_card *card = isdnloop_findcard(id);
1401
1402         if (card) {
1403                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1404                         return -ENODEV;
1405                 return isdnloop_readstatus(buf, len, card);
1406         }
1407         printk(KERN_ERR
1408                "isdnloop: if_readstatus called with invalid driverId!\n");
1409         return -ENODEV;
1410 }
1411
1412 static int
1413 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1414 {
1415         isdnloop_card *card = isdnloop_findcard(id);
1416
1417         if (card) {
1418                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1419                         return -ENODEV;
1420                 /* ack request stored in skb scratch area */
1421                 *(skb->head) = ack;
1422                 return isdnloop_sendbuf(channel, skb, card);
1423         }
1424         printk(KERN_ERR
1425                "isdnloop: if_sendbuf called with invalid driverId!\n");
1426         return -ENODEV;
1427 }
1428
1429 /*
1430  * Allocate a new card-struct, initialize it
1431  * link it into cards-list and register it at linklevel.
1432  */
1433 static isdnloop_card *
1434 isdnloop_initcard(char *id)
1435 {
1436         isdnloop_card *card;
1437         int i;
1438         card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL);
1439         if (!card) {
1440                 printk(KERN_WARNING
1441                        "isdnloop: (%s) Could not allocate card-struct.\n", id);
1442                 return (isdnloop_card *) 0;
1443         }
1444         card->interface.owner = THIS_MODULE;
1445         card->interface.channels = ISDNLOOP_BCH;
1446         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/
1447         card->interface.maxbufsize = 4000;
1448         card->interface.command = if_command;
1449         card->interface.writebuf_skb = if_sendbuf;
1450         card->interface.writecmd = if_writecmd;
1451         card->interface.readstat = if_readstatus;
1452         card->interface.features = ISDN_FEATURE_L2_X75I |
1453 #ifdef CONFIG_ISDN_X25
1454                 ISDN_FEATURE_L2_X25DTE |
1455                 ISDN_FEATURE_L2_X25DCE |
1456 #endif
1457                 ISDN_FEATURE_L2_HDLC |
1458                 ISDN_FEATURE_L3_TRANS |
1459                 ISDN_FEATURE_P_UNKNOWN;
1460         card->ptype = ISDN_PTYPE_UNKNOWN;
1461         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1462         card->msg_buf_write = card->msg_buf;
1463         card->msg_buf_read = card->msg_buf;
1464         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1465         for (i = 0; i < ISDNLOOP_BCH; i++) {
1466                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1467                 skb_queue_head_init(&card->bqueue[i]);
1468         }
1469         skb_queue_head_init(&card->dqueue);
1470         spin_lock_init(&card->isdnloop_lock);
1471         card->next = cards;
1472         cards = card;
1473         if (!register_isdn(&card->interface)) {
1474                 cards = cards->next;
1475                 printk(KERN_WARNING
1476                        "isdnloop: Unable to register %s\n", id);
1477                 kfree(card);
1478                 return (isdnloop_card *) 0;
1479         }
1480         card->myid = card->interface.channels;
1481         return card;
1482 }
1483
1484 static int
1485 isdnloop_addcard(char *id1)
1486 {
1487         isdnloop_card *card;
1488         card = isdnloop_initcard(id1);
1489         if (!card) {
1490                 return -EIO;
1491         }
1492         printk(KERN_INFO
1493                "isdnloop: (%s) virtual card added\n",
1494                card->interface.id);
1495         return 0;
1496 }
1497
1498 static int __init
1499 isdnloop_init(void)
1500 {
1501         if (isdnloop_id)
1502                 return isdnloop_addcard(isdnloop_id);
1503
1504         return 0;
1505 }
1506
1507 static void __exit
1508 isdnloop_exit(void)
1509 {
1510         isdn_ctrl cmd;
1511         isdnloop_card *card = cards;
1512         isdnloop_card *last;
1513         int i;
1514
1515         isdnloop_stopallcards();
1516         while (card) {
1517                 cmd.command = ISDN_STAT_UNLOAD;
1518                 cmd.driver = card->myid;
1519                 card->interface.statcallb(&cmd);
1520                 for (i = 0; i < ISDNLOOP_BCH; i++)
1521                         isdnloop_free_queue(card, i);
1522                 card = card->next;
1523         }
1524         card = cards;
1525         while (card) {
1526                 last = card;
1527                 skb_queue_purge(&card->dqueue);
1528                 card = card->next;
1529                 kfree(last);
1530         }
1531         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1532 }
1533
1534 module_init(isdnloop_init);
1535 module_exit(isdnloop_exit);