summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/gigaset/i4l.c
blob: 3c127a8cbaf2261f473e28a01b29c0e00c2f2c93 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
/*
 * Stuff used by all variants of the driver
 *
 * Copyright (c) 2001 by Stefan Eilers,
 *                       Hansjoerg Lipp <hjlipp@web.de>,
 *                       Tilman Schmidt <tilman@imap.cc>.
 *
 * =====================================================================
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation; either version 2 of
 *	the License, or (at your option) any later version.
 * =====================================================================
 */

#include "gigaset.h"

/* == Handling of I4L IO =====================================================*/

/* writebuf_from_LL
 * called by LL to transmit data on an open channel
 * inserts the buffer data into the send queue and starts the transmission
 * Note that this operation must not sleep!
 * When the buffer is processed completely, gigaset_skb_sent() should be called.
 * parameters:
 *	driverID	driver ID as assigned by LL
 *	channel		channel number
 *	ack		if != 0 LL wants to be notified on completion via
 *			statcallb(ISDN_STAT_BSENT)
 *	skb		skb containing data to send
 * return value:
 *	number of accepted bytes
 *	0 if temporarily unable to accept data (out of buffer space)
 *	<0 on error (eg. -EINVAL)
 */
static int writebuf_from_LL(int driverID, int channel, int ack,
			    struct sk_buff *skb)
{
	struct cardstate *cs;
	struct bc_state *bcs;
	unsigned len;
	unsigned skblen;

	if (!(cs = gigaset_get_cs_by_id(driverID))) {
		err("%s: invalid driver ID (%d)", __func__, driverID);
		return -ENODEV;
	}
	if (channel < 0 || channel >= cs->channels) {
		dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
			__func__, channel);
		return -ENODEV;
	}
	bcs = &cs->bcs[channel];
	len = skb->len;

	gig_dbg(DEBUG_LLDATA,
		"Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
		driverID, channel, ack, len);

	if (!len) {
		if (ack)
			dev_notice(cs->dev, "%s: not ACKing empty packet\n",
				   __func__);
		return 0;
	}
	if (len > MAX_BUF_SIZE) {
		dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
			__func__, len);
		return -EINVAL;
	}

	skblen = ack ? len : 0;
	skb->head[0] = skblen & 0xff;
	skb->head[1] = skblen >> 8;
	gig_dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x",
		len, skblen, (unsigned) skb->head[0], (unsigned) skb->head[1]);

	/* pass to device-specific module */
	return cs->ops->send_skb(bcs, skb);
}

void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
{
	unsigned len;
	isdn_ctrl response;

	++bcs->trans_up;

	if (skb->len)
		dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
			 __func__, skb->len);

	len = (unsigned char) skb->head[0] |
	      (unsigned) (unsigned char) skb->head[1] << 8;
	if (len) {
		gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
			bcs->cs->myid, bcs->channel, len);

		response.driver = bcs->cs->myid;
		response.command = ISDN_STAT_BSENT;
		response.arg = bcs->channel;
		response.parm.length = len;
		bcs->cs->iif.statcallb(&response);
	}
}
EXPORT_SYMBOL_GPL(gigaset_skb_sent);

/* This function will be called by LL to send commands
 * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
 * so don't put too much effort into it.
 */
static int command_from_LL(isdn_ctrl *cntrl)
{
	struct cardstate *cs = gigaset_get_cs_by_id(cntrl->driver);
	struct bc_state *bcs;
	int retval = 0;
	struct setup_parm *sp;

	gigaset_debugdrivers();

	if (!cs) {
		err("%s: invalid driver ID (%d)", __func__, cntrl->driver);
		return -ENODEV;
	}

	switch (cntrl->command) {
	case ISDN_CMD_IOCTL:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver: %d, arg: %ld)",
			cntrl->driver, cntrl->arg);

		dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
		return -EINVAL;

	case ISDN_CMD_DIAL:
		gig_dbg(DEBUG_ANY,
			"ISDN_CMD_DIAL (driver: %d, ch: %ld, "
			"phone: %s, ownmsn: %s, si1: %d, si2: %d)",
			cntrl->driver, cntrl->arg,
			cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
			cntrl->parm.setup.si1, cntrl->parm.setup.si2);

		if (cntrl->arg >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_DIAL: invalid channel (%d)\n",
				(int) cntrl->arg);
			return -EINVAL;
		}

		bcs = cs->bcs + cntrl->arg;

		if (!gigaset_get_channel(bcs)) {
			dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
			return -EBUSY;
		}

		sp = kmalloc(sizeof *sp, GFP_ATOMIC);
		if (!sp) {
			gigaset_free_channel(bcs);
			dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
			return -ENOMEM;
		}
		*sp = cntrl->parm.setup;

		if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
				       bcs->at_state.seq_index, NULL)) {
			//FIXME what should we do?
			kfree(sp);
			gigaset_free_channel(bcs);
			return -ENOMEM;
		}

		gig_dbg(DEBUG_CMD, "scheduling DIAL");
		gigaset_schedule_event(cs);
		break;
	case ISDN_CMD_ACCEPTD: //FIXME
		gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");

		if (cntrl->arg >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_ACCEPTD: invalid channel (%d)\n",
				(int) cntrl->arg);
			return -EINVAL;
		}

		if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
				       EV_ACCEPT, NULL, 0, NULL)) {
			//FIXME what should we do?
			return -ENOMEM;
		}

		gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
		gigaset_schedule_event(cs);

		break;
	case ISDN_CMD_ACCEPTB:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
		break;
	case ISDN_CMD_HANGUP:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_HANGUP (ch: %d)",
			(int) cntrl->arg);

		if (cntrl->arg >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_HANGUP: invalid channel (%d)\n",
				(int) cntrl->arg);
			return -EINVAL;
		}

		if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
				       EV_HUP, NULL, 0, NULL)) {
			//FIXME what should we do?
			return -ENOMEM;
		}

		gig_dbg(DEBUG_CMD, "scheduling HUP");
		gigaset_schedule_event(cs);

		break;
	case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
		gig_dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
		break;
	case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
		gig_dbg(DEBUG_ANY,
			"ISDN_CMD_SETEAZ (id: %d, ch: %ld, number: %s)",
			cntrl->driver, cntrl->arg, cntrl->parm.num);
		break;
	case ISDN_CMD_SETL2: /* Set L2 to given protocol */
		gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (ch: %ld, proto: %lx)",
			cntrl->arg & 0xff, (cntrl->arg >> 8));

		if ((cntrl->arg & 0xff) >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_SETL2: invalid channel (%d)\n",
				(int) cntrl->arg & 0xff);
			return -EINVAL;
		}

		if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
				       EV_PROTO_L2, NULL, cntrl->arg >> 8,
				       NULL)) {
			//FIXME what should we do?
			return -ENOMEM;
		}

		gig_dbg(DEBUG_CMD, "scheduling PROTO_L2");
		gigaset_schedule_event(cs);
		break;
	case ISDN_CMD_SETL3: /* Set L3 to given protocol */
		gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (ch: %ld, proto: %lx)",
			cntrl->arg & 0xff, (cntrl->arg >> 8));

		if ((cntrl->arg & 0xff) >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_SETL3: invalid channel (%d)\n",
				(int) cntrl->arg & 0xff);
			return -EINVAL;
		}

		if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
			dev_err(cs->dev,
				"ISDN_CMD_SETL3: invalid protocol %lu\n",
				cntrl->arg >> 8);
			return -EINVAL;
		}

		break;
	case ISDN_CMD_PROCEED:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
		break;
	case ISDN_CMD_ALERT:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
		if (cntrl->arg >= cs->channels) {
			dev_err(cs->dev,
				"ISDN_CMD_ALERT: invalid channel (%d)\n",
				(int) cntrl->arg);
			return -EINVAL;
		}
		//bcs = cs->bcs + cntrl->arg;
		//bcs->proto2 = -1;
		// FIXME
		break;
	case ISDN_CMD_REDIR:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
		break;
	case ISDN_CMD_PROT_IO:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
		break;
	case ISDN_CMD_FAXCMD:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
		break;
	case ISDN_CMD_GETL2:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
		break;
	case ISDN_CMD_GETL3:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
		break;
	case ISDN_CMD_GETEAZ:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
		break;
	case ISDN_CMD_SETSIL:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
		break;
	case ISDN_CMD_GETSIL:
		gig_dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
		break;
	default:
		dev_err(cs->dev, "unknown command %d from LL\n",
			cntrl->command);
		return -EINVAL;
	}

	return retval;
}

void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
{
	isdn_ctrl command;

	command.driver = cs->myid;
	command.command = cmd;
	command.arg = 0;
	cs->iif.statcallb(&command);
}

void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
{
	isdn_ctrl command;

	command.driver = bcs->cs->myid;
	command.command = cmd;
	command.arg = bcs->channel;
	bcs->cs->iif.statcallb(&command);
}

int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data)
{
	struct bc_state *bcs = at_state->bcs;
	unsigned proto;
	const char *bc;
	size_t length[AT_NUM];
	size_t l;
	int i;
	struct setup_parm *sp = data;

	switch (bcs->proto2) {
	case ISDN_PROTO_L2_HDLC:
		proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
		break;
	case ISDN_PROTO_L2_TRANS:
		proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
		break;
	default:
		dev_err(bcs->cs->dev, "%s: invalid L2 protocol: %u\n",
			__func__, bcs->proto2);
		return -EINVAL;
	}

	switch (sp->si1) {
	case 1:		/* audio */
		bc = "9090A3";	/* 3.1 kHz audio, A-law */
		break;
	case 7:		/* data */
	default:	/* hope the app knows what it is doing */
		bc = "8890";	/* unrestricted digital information */
	}
	//FIXME add missing si1 values from 1TR6, inspect si2, set HLC/LLC

	length[AT_DIAL ] = 1 + strlen(sp->phone) + 1 + 1;
	l = strlen(sp->eazmsn);
	length[AT_MSN  ] = l ? 6 + l + 1 + 1 : 0;
	length[AT_BC   ] = 5 + strlen(bc) + 1 + 1;
	length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
	length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
	length[AT_TYPE ] = 6 + 1 + 1 + 1; /* call type: 1 character */
	length[AT_HLC  ] = 0;

	for (i = 0; i < AT_NUM; ++i) {
		kfree(bcs->commands[i]);
		bcs->commands[i] = NULL;
		if (length[i] &&
		    !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
			dev_err(bcs->cs->dev, "out of memory\n");
			return -ENOMEM;
		}
	}

	/* type = 1: extern, 0: intern, 2: recall, 3: door, 4: centrex */
	if (sp->phone[0] == '*' && sp->phone[1] == '*') {
		/* internal call: translate ** prefix to CTP value */
		snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
			 "D%s\r", sp->phone+2);
		strncpy(bcs->commands[AT_TYPE], "^SCTP=0\r", length[AT_TYPE]);
	} else {
		snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
			 "D%s\r", sp->phone);
		strncpy(bcs->commands[AT_TYPE], "^SCTP=1\r", length[AT_TYPE]);
	}

	if (bcs->commands[AT_MSN])
		snprintf(bcs->commands[AT_MSN], length[AT_MSN],
			 "^SMSN=%s\r", sp->eazmsn);
	snprintf(bcs->commands[AT_BC   ], length[AT_BC   ],
		 "^SBC=%s\r", bc);
	snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
		 "^SBPR=%u\r", proto);
	snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
		 "^SISO=%u\r", (unsigned)bcs->channel + 1);

	return 0;
}

int gigaset_isdn_setup_accept(struct at_state_t *at_state)
{
	unsigned proto;
	size_t length[AT_NUM];
	int i;
	struct bc_state *bcs = at_state->bcs;

	switch (bcs->proto2) {
	case ISDN_PROTO_L2_HDLC:
		proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
		break;
	case ISDN_PROTO_L2_TRANS:
		proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
		break;
	default:
		dev_err(at_state->cs->dev, "%s: invalid protocol: %u\n",
			__func__, bcs->proto2);
		return -EINVAL;
	}

	length[AT_DIAL ] = 0;
	length[AT_MSN  ] = 0;
	length[AT_BC   ] = 0;
	length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
	length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
	length[AT_TYPE ] = 0;
	length[AT_HLC  ] = 0;

	for (i = 0; i < AT_NUM; ++i) {
		kfree(bcs->commands[i]);
		bcs->commands[i] = NULL;
		if (length[i] &&
		    !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
			dev_err(at_state->cs->dev, "out of memory\n");
			return -ENOMEM;
		}
	}

	snprintf(bcs->commands[AT_PROTO], length[AT_PROTO],
		 "^SBPR=%u\r", proto);
	snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ],
		 "^SISO=%u\r", (unsigned) bcs->channel + 1);

	return 0;
}

int gigaset_isdn_icall(struct at_state_t *at_state)
{
	struct cardstate *cs = at_state->cs;
	struct bc_state *bcs = at_state->bcs;
	isdn_ctrl response;
	int retval;

	/* fill ICALL structure */
	response.parm.setup.si1 = 0;	/* default: unknown */
	response.parm.setup.si2 = 0;
	response.parm.setup.screen = 0;	//FIXME how to set these?
	response.parm.setup.plan = 0;
	if (!at_state->str_var[STR_ZBC]) {
		/* no BC (internal call): assume speech, A-law */
		response.parm.setup.si1 = 1;
	} else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
		/* unrestricted digital information */
		response.parm.setup.si1 = 7;
	} else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
		/* speech, A-law */
		response.parm.setup.si1 = 1;
	} else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
		/* 3,1 kHz audio, A-law */
		response.parm.setup.si1 = 1;
		response.parm.setup.si2 = 2;
	} else {
		dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
		     at_state->str_var[STR_ZBC]);
		return ICALL_IGNORE;
	}
	if (at_state->str_var[STR_NMBR]) {
		strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
			sizeof response.parm.setup.phone - 1);
		response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
	} else
		response.parm.setup.phone[0] = 0;
	if (at_state->str_var[STR_ZCPN]) {
		strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
			sizeof response.parm.setup.eazmsn - 1);
		response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
	} else
		response.parm.setup.eazmsn[0] = 0;

	if (!bcs) {
		dev_notice(cs->dev, "no channel for incoming call\n");
		response.command = ISDN_STAT_ICALLW;
		response.arg = 0; //FIXME
	} else {
		gig_dbg(DEBUG_CMD, "Sending ICALL");
		response.command = ISDN_STAT_ICALL;
		response.arg = bcs->channel; //FIXME
	}
	response.driver = cs->myid;
	retval = cs->iif.statcallb(&response);
	gig_dbg(DEBUG_CMD, "Response: %d", retval);
	switch (retval) {
	case 0:	/* no takers */
		return ICALL_IGNORE;
	case 1:	/* alerting */
		bcs->chstate |= CHS_NOTIFY_LL;
		return ICALL_ACCEPT;
	case 2:	/* reject */
		return ICALL_REJECT;
	case 3:	/* incomplete */
		dev_warn(cs->dev,
		       "LL requested unsupported feature: Incomplete Number\n");
		return ICALL_IGNORE;
	case 4:	/* proceeding */
		/* Gigaset will send ALERTING anyway.
		 * There doesn't seem to be a way to avoid this.
		 */
		return ICALL_ACCEPT;
	case 5:	/* deflect */
		dev_warn(cs->dev,
			 "LL requested unsupported feature: Call Deflection\n");
		return ICALL_IGNORE;
	default:
		dev_err(cs->dev, "LL error %d on ICALL\n", retval);
		return ICALL_IGNORE;
	}
}

/* Set Callback function pointer */
int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
{
	isdn_if *iif = &cs->iif;

	gig_dbg(DEBUG_ANY, "Register driver capabilities to LL");

	//iif->id[sizeof(iif->id) - 1]=0;
	//strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
	if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
	    >= sizeof iif->id)
		return -ENOMEM; //FIXME EINVAL/...??

	iif->owner = THIS_MODULE;
	iif->channels = cs->channels;
	iif->maxbufsize = MAX_BUF_SIZE;
	iif->features = ISDN_FEATURE_L2_TRANS |
		ISDN_FEATURE_L2_HDLC |
#ifdef GIG_X75
		ISDN_FEATURE_L2_X75I |
#endif
		ISDN_FEATURE_L3_TRANS |
		ISDN_FEATURE_P_EURO;
	iif->hl_hdrlen = HW_HDR_LEN;		/* Area for storing ack */
	iif->command = command_from_LL;
	iif->writebuf_skb = writebuf_from_LL;
	iif->writecmd = NULL;			/* Don't support isdnctrl */
	iif->readstat = NULL;			/* Don't support isdnctrl */
	iif->rcvcallb_skb = NULL;		/* Will be set by LL */
	iif->statcallb = NULL;			/* Will be set by LL */

	if (!register_isdn(iif))
		return 0;

	cs->myid = iif->channels;		/* Set my device id */
	return 1;
}