1/*
2 * Stuff used by all variants of the driver
3 *
4 * Copyright (c) 2001 by Stefan Eilers,
5 *                       Hansjoerg Lipp <hjlipp@web.de>,
6 *                       Tilman Schmidt <tilman@imap.cc>.
7 *
8 * =====================================================================
9 *	This program is free software; you can redistribute it and/or
10 *	modify it under the terms of the GNU General Public License as
11 *	published by the Free Software Foundation; either version 2 of
12 *	the License, or (at your option) any later version.
13 * =====================================================================
14 */
15
16#include "gigaset.h"
17#include <linux/isdnif.h>
18#include <linux/export.h>
19
20#define SBUFSIZE	4096	/* sk_buff payload size */
21#define TRANSBUFSIZE	768	/* bytes per skb for transparent receive */
22#define HW_HDR_LEN	2	/* Header size used to store ack info */
23#define MAX_BUF_SIZE	(SBUFSIZE - HW_HDR_LEN)	/* max data packet from LL */
24
25/* == Handling of I4L IO =====================================================*/
26
27/* writebuf_from_LL
28 * called by LL to transmit data on an open channel
29 * inserts the buffer data into the send queue and starts the transmission
30 * Note that this operation must not sleep!
31 * When the buffer is processed completely, gigaset_skb_sent() should be called.
32 * parameters:
33 *	driverID	driver ID as assigned by LL
34 *	channel		channel number
35 *	ack		if != 0 LL wants to be notified on completion via
36 *			statcallb(ISDN_STAT_BSENT)
37 *	skb		skb containing data to send
38 * return value:
39 *	number of accepted bytes
40 *	0 if temporarily unable to accept data (out of buffer space)
41 *	<0 on error (eg. -EINVAL)
42 */
43static int writebuf_from_LL(int driverID, int channel, int ack,
44			    struct sk_buff *skb)
45{
46	struct cardstate *cs = gigaset_get_cs_by_id(driverID);
47	struct bc_state *bcs;
48	unsigned char *ack_header;
49	unsigned len;
50
51	if (!cs) {
52		pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
53		return -ENODEV;
54	}
55	if (channel < 0 || channel >= cs->channels) {
56		dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
57			__func__, channel);
58		return -ENODEV;
59	}
60	bcs = &cs->bcs[channel];
61
62	/* can only handle linear sk_buffs */
63	if (skb_linearize(skb) < 0) {
64		dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
65		return -ENOMEM;
66	}
67	len = skb->len;
68
69	gig_dbg(DEBUG_LLDATA,
70		"Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
71		driverID, channel, ack, len);
72
73	if (!len) {
74		if (ack)
75			dev_notice(cs->dev, "%s: not ACKing empty packet\n",
76				   __func__);
77		return 0;
78	}
79	if (len > MAX_BUF_SIZE) {
80		dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
81			__func__, len);
82		return -EINVAL;
83	}
84
85	/* set up acknowledgement header */
86	if (skb_headroom(skb) < HW_HDR_LEN) {
87		/* should never happen */
88		dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
89		return -ENOMEM;
90	}
91	skb_set_mac_header(skb, -HW_HDR_LEN);
92	skb->mac_len = HW_HDR_LEN;
93	ack_header = skb_mac_header(skb);
94	if (ack) {
95		ack_header[0] = len & 0xff;
96		ack_header[1] = len >> 8;
97	} else {
98		ack_header[0] = ack_header[1] = 0;
99	}
100	gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
101		len, ack, ack_header[0], ack_header[1]);
102
103	/* pass to device-specific module */
104	return cs->ops->send_skb(bcs, skb);
105}
106
107/**
108 * gigaset_skb_sent() - acknowledge sending an skb
109 * @bcs:	B channel descriptor structure.
110 * @skb:	sent data.
111 *
112 * Called by hardware module {bas,ser,usb}_gigaset when the data in a
113 * skb has been successfully sent, for signalling completion to the LL.
114 */
115void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
116{
117	isdn_if *iif = bcs->cs->iif;
118	unsigned char *ack_header = skb_mac_header(skb);
119	unsigned len;
120	isdn_ctrl response;
121
122	++bcs->trans_up;
123
124	if (skb->len)
125		dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
126			 __func__, skb->len);
127
128	len = ack_header[0] + ((unsigned) ack_header[1] << 8);
129	if (len) {
130		gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
131			bcs->cs->myid, bcs->channel, len);
132
133		response.driver = bcs->cs->myid;
134		response.command = ISDN_STAT_BSENT;
135		response.arg = bcs->channel;
136		response.parm.length = len;
137		iif->statcallb(&response);
138	}
139}
140EXPORT_SYMBOL_GPL(gigaset_skb_sent);
141
142/**
143 * gigaset_skb_rcvd() - pass received skb to LL
144 * @bcs:	B channel descriptor structure.
145 * @skb:	received data.
146 *
147 * Called by hardware module {bas,ser,usb}_gigaset when user data has
148 * been successfully received, for passing to the LL.
149 * Warning: skb must not be accessed anymore!
150 */
151void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
152{
153	isdn_if *iif = bcs->cs->iif;
154
155	iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
156	bcs->trans_down++;
157}
158EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
159
160/**
161 * gigaset_isdn_rcv_err() - signal receive error
162 * @bcs:	B channel descriptor structure.
163 *
164 * Called by hardware module {bas,ser,usb}_gigaset when a receive error
165 * has occurred, for signalling to the LL.
166 */
167void gigaset_isdn_rcv_err(struct bc_state *bcs)
168{
169	isdn_if *iif = bcs->cs->iif;
170	isdn_ctrl response;
171
172	/* if currently ignoring packets, just count down */
173	if (bcs->ignore) {
174		bcs->ignore--;
175		return;
176	}
177
178	/* update statistics */
179	bcs->corrupted++;
180
181	/* error -> LL */
182	gig_dbg(DEBUG_CMD, "sending L1ERR");
183	response.driver = bcs->cs->myid;
184	response.command = ISDN_STAT_L1ERR;
185	response.arg = bcs->channel;
186	response.parm.errcode = ISDN_STAT_L1ERR_RECV;
187	iif->statcallb(&response);
188}
189EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
190
191/* This function will be called by LL to send commands
192 * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
193 * so don't put too much effort into it.
194 */
195static int command_from_LL(isdn_ctrl *cntrl)
196{
197	struct cardstate *cs;
198	struct bc_state *bcs;
199	int retval = 0;
200	char **commands;
201	int ch;
202	int i;
203	size_t l;
204
205	gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx",
206		cntrl->driver, cntrl->command, cntrl->arg);
207
208	cs = gigaset_get_cs_by_id(cntrl->driver);
209	if (cs == NULL) {
210		pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver);
211		return -ENODEV;
212	}
213	ch = cntrl->arg & 0xff;
214
215	switch (cntrl->command) {
216	case ISDN_CMD_IOCTL:
217		dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
218		return -EINVAL;
219
220	case ISDN_CMD_DIAL:
221		gig_dbg(DEBUG_CMD,
222			"ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
223			cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
224			cntrl->parm.setup.si1, cntrl->parm.setup.si2);
225
226		if (ch >= cs->channels) {
227			dev_err(cs->dev,
228				"ISDN_CMD_DIAL: invalid channel (%d)\n", ch);
229			return -EINVAL;
230		}
231		bcs = cs->bcs + ch;
232		if (!gigaset_get_channel(bcs)) {
233			dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
234			return -EBUSY;
235		}
236		switch (bcs->proto2) {
237		case L2_HDLC:
238			bcs->rx_bufsize = SBUFSIZE;
239			break;
240		default:			/* assume transparent */
241			bcs->rx_bufsize = TRANSBUFSIZE;
242		}
243		dev_kfree_skb(bcs->rx_skb);
244		gigaset_new_rx_skb(bcs);
245
246		commands = kzalloc(AT_NUM * (sizeof *commands), GFP_ATOMIC);
247		if (!commands) {
248			gigaset_free_channel(bcs);
249			dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
250			return -ENOMEM;
251		}
252
253		l = 3 + strlen(cntrl->parm.setup.phone);
254		commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
255		if (!commands[AT_DIAL])
256			goto oom;
257		if (cntrl->parm.setup.phone[0] == '*' &&
258		    cntrl->parm.setup.phone[1] == '*') {
259			/* internal call: translate ** prefix to CTP value */
260			commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
261			if (!commands[AT_TYPE])
262				goto oom;
263			snprintf(commands[AT_DIAL], l,
264				 "D%s\r", cntrl->parm.setup.phone + 2);
265		} else {
266			commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
267			if (!commands[AT_TYPE])
268				goto oom;
269			snprintf(commands[AT_DIAL], l,
270				 "D%s\r", cntrl->parm.setup.phone);
271		}
272
273		l = strlen(cntrl->parm.setup.eazmsn);
274		if (l) {
275			l += 8;
276			commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
277			if (!commands[AT_MSN])
278				goto oom;
279			snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
280				 cntrl->parm.setup.eazmsn);
281		}
282
283		switch (cntrl->parm.setup.si1) {
284		case 1:		/* audio */
285			/* BC = 9090A3: 3.1 kHz audio, A-law */
286			commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
287			if (!commands[AT_BC])
288				goto oom;
289			break;
290		case 7:		/* data */
291		default:	/* hope the app knows what it is doing */
292			/* BC = 8890: unrestricted digital information */
293			commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
294			if (!commands[AT_BC])
295				goto oom;
296		}
297		/* ToDo: other si1 values, inspect si2, set HLC/LLC */
298
299		commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
300		if (!commands[AT_PROTO])
301			goto oom;
302		snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
303
304		commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
305		if (!commands[AT_ISO])
306			goto oom;
307		snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
308			 (unsigned) bcs->channel + 1);
309
310		if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
311				       bcs->at_state.seq_index, NULL)) {
312			for (i = 0; i < AT_NUM; ++i)
313				kfree(commands[i]);
314			kfree(commands);
315			gigaset_free_channel(bcs);
316			return -ENOMEM;
317		}
318		gigaset_schedule_event(cs);
319		break;
320	case ISDN_CMD_ACCEPTD:
321		gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD");
322		if (ch >= cs->channels) {
323			dev_err(cs->dev,
324				"ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch);
325			return -EINVAL;
326		}
327		bcs = cs->bcs + ch;
328		switch (bcs->proto2) {
329		case L2_HDLC:
330			bcs->rx_bufsize = SBUFSIZE;
331			break;
332		default:			/* assume transparent */
333			bcs->rx_bufsize = TRANSBUFSIZE;
334		}
335		dev_kfree_skb(bcs->rx_skb);
336		gigaset_new_rx_skb(bcs);
337		if (!gigaset_add_event(cs, &bcs->at_state,
338				       EV_ACCEPT, NULL, 0, NULL))
339			return -ENOMEM;
340		gigaset_schedule_event(cs);
341
342		break;
343	case ISDN_CMD_HANGUP:
344		gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP");
345		if (ch >= cs->channels) {
346			dev_err(cs->dev,
347				"ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
348			return -EINVAL;
349		}
350		bcs = cs->bcs + ch;
351		if (!gigaset_add_event(cs, &bcs->at_state,
352				       EV_HUP, NULL, 0, NULL))
353			return -ENOMEM;
354		gigaset_schedule_event(cs);
355
356		break;
357	case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
358		dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
359		break;
360	case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
361		dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
362			 cntrl->parm.num);
363		break;
364	case ISDN_CMD_SETL2: /* Set L2 to given protocol */
365		if (ch >= cs->channels) {
366			dev_err(cs->dev,
367				"ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
368			return -EINVAL;
369		}
370		bcs = cs->bcs + ch;
371		if (bcs->chstate & CHS_D_UP) {
372			dev_err(cs->dev,
373				"ISDN_CMD_SETL2: channel active (%d)\n", ch);
374			return -EINVAL;
375		}
376		switch (cntrl->arg >> 8) {
377		case ISDN_PROTO_L2_HDLC:
378			gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
379			bcs->proto2 = L2_HDLC;
380			break;
381		case ISDN_PROTO_L2_TRANS:
382			gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
383			bcs->proto2 = L2_VOICE;
384			break;
385		default:
386			dev_err(cs->dev,
387				"ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
388				cntrl->arg >> 8);
389			return -EINVAL;
390		}
391		break;
392	case ISDN_CMD_SETL3: /* Set L3 to given protocol */
393		gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3");
394		if (ch >= cs->channels) {
395			dev_err(cs->dev,
396				"ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
397			return -EINVAL;
398		}
399
400		if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
401			dev_err(cs->dev,
402				"ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
403				cntrl->arg >> 8);
404			return -EINVAL;
405		}
406
407		break;
408
409	default:
410		gig_dbg(DEBUG_CMD, "unknown command %d from LL",
411			cntrl->command);
412		return -EINVAL;
413	}
414
415	return retval;
416
417oom:
418	dev_err(bcs->cs->dev, "out of memory\n");
419	for (i = 0; i < AT_NUM; ++i)
420		kfree(commands[i]);
421	kfree(commands);
422	gigaset_free_channel(bcs);
423	return -ENOMEM;
424}
425
426static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
427{
428	isdn_if *iif = cs->iif;
429	isdn_ctrl command;
430
431	command.driver = cs->myid;
432	command.command = cmd;
433	command.arg = 0;
434	iif->statcallb(&command);
435}
436
437static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
438{
439	isdn_if *iif = bcs->cs->iif;
440	isdn_ctrl command;
441
442	command.driver = bcs->cs->myid;
443	command.command = cmd;
444	command.arg = bcs->channel;
445	iif->statcallb(&command);
446}
447
448/**
449 * gigaset_isdn_icall() - signal incoming call
450 * @at_state:	connection state structure.
451 *
452 * Called by main module to notify the LL that an incoming call has been
453 * received. @at_state contains the parameters of the call.
454 *
455 * Return value: call disposition (ICALL_*)
456 */
457int gigaset_isdn_icall(struct at_state_t *at_state)
458{
459	struct cardstate *cs = at_state->cs;
460	struct bc_state *bcs = at_state->bcs;
461	isdn_if *iif = cs->iif;
462	isdn_ctrl response;
463	int retval;
464
465	/* fill ICALL structure */
466	response.parm.setup.si1 = 0;	/* default: unknown */
467	response.parm.setup.si2 = 0;
468	response.parm.setup.screen = 0;
469	response.parm.setup.plan = 0;
470	if (!at_state->str_var[STR_ZBC]) {
471		/* no BC (internal call): assume speech, A-law */
472		response.parm.setup.si1 = 1;
473	} else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
474		/* unrestricted digital information */
475		response.parm.setup.si1 = 7;
476	} else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
477		/* speech, A-law */
478		response.parm.setup.si1 = 1;
479	} else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
480		/* 3,1 kHz audio, A-law */
481		response.parm.setup.si1 = 1;
482		response.parm.setup.si2 = 2;
483	} else {
484		dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
485			 at_state->str_var[STR_ZBC]);
486		return ICALL_IGNORE;
487	}
488	if (at_state->str_var[STR_NMBR]) {
489		strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
490			sizeof response.parm.setup.phone);
491	} else
492		response.parm.setup.phone[0] = 0;
493	if (at_state->str_var[STR_ZCPN]) {
494		strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
495			sizeof response.parm.setup.eazmsn);
496	} else
497		response.parm.setup.eazmsn[0] = 0;
498
499	if (!bcs) {
500		dev_notice(cs->dev, "no channel for incoming call\n");
501		response.command = ISDN_STAT_ICALLW;
502		response.arg = 0;
503	} else {
504		gig_dbg(DEBUG_CMD, "Sending ICALL");
505		response.command = ISDN_STAT_ICALL;
506		response.arg = bcs->channel;
507	}
508	response.driver = cs->myid;
509	retval = iif->statcallb(&response);
510	gig_dbg(DEBUG_CMD, "Response: %d", retval);
511	switch (retval) {
512	case 0:	/* no takers */
513		return ICALL_IGNORE;
514	case 1:	/* alerting */
515		bcs->chstate |= CHS_NOTIFY_LL;
516		return ICALL_ACCEPT;
517	case 2:	/* reject */
518		return ICALL_REJECT;
519	case 3:	/* incomplete */
520		dev_warn(cs->dev,
521			 "LL requested unsupported feature: Incomplete Number\n");
522		return ICALL_IGNORE;
523	case 4:	/* proceeding */
524		/* Gigaset will send ALERTING anyway.
525		 * There doesn't seem to be a way to avoid this.
526		 */
527		return ICALL_ACCEPT;
528	case 5:	/* deflect */
529		dev_warn(cs->dev,
530			 "LL requested unsupported feature: Call Deflection\n");
531		return ICALL_IGNORE;
532	default:
533		dev_err(cs->dev, "LL error %d on ICALL\n", retval);
534		return ICALL_IGNORE;
535	}
536}
537
538/**
539 * gigaset_isdn_connD() - signal D channel connect
540 * @bcs:	B channel descriptor structure.
541 *
542 * Called by main module to notify the LL that the D channel connection has
543 * been established.
544 */
545void gigaset_isdn_connD(struct bc_state *bcs)
546{
547	gig_dbg(DEBUG_CMD, "sending DCONN");
548	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
549}
550
551/**
552 * gigaset_isdn_hupD() - signal D channel hangup
553 * @bcs:	B channel descriptor structure.
554 *
555 * Called by main module to notify the LL that the D channel connection has
556 * been shut down.
557 */
558void gigaset_isdn_hupD(struct bc_state *bcs)
559{
560	gig_dbg(DEBUG_CMD, "sending DHUP");
561	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
562}
563
564/**
565 * gigaset_isdn_connB() - signal B channel connect
566 * @bcs:	B channel descriptor structure.
567 *
568 * Called by main module to notify the LL that the B channel connection has
569 * been established.
570 */
571void gigaset_isdn_connB(struct bc_state *bcs)
572{
573	gig_dbg(DEBUG_CMD, "sending BCONN");
574	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
575}
576
577/**
578 * gigaset_isdn_hupB() - signal B channel hangup
579 * @bcs:	B channel descriptor structure.
580 *
581 * Called by main module to notify the LL that the B channel connection has
582 * been shut down.
583 */
584void gigaset_isdn_hupB(struct bc_state *bcs)
585{
586	gig_dbg(DEBUG_CMD, "sending BHUP");
587	gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
588}
589
590/**
591 * gigaset_isdn_start() - signal device availability
592 * @cs:		device descriptor structure.
593 *
594 * Called by main module to notify the LL that the device is available for
595 * use.
596 */
597void gigaset_isdn_start(struct cardstate *cs)
598{
599	gig_dbg(DEBUG_CMD, "sending RUN");
600	gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
601}
602
603/**
604 * gigaset_isdn_stop() - signal device unavailability
605 * @cs:		device descriptor structure.
606 *
607 * Called by main module to notify the LL that the device is no longer
608 * available for use.
609 */
610void gigaset_isdn_stop(struct cardstate *cs)
611{
612	gig_dbg(DEBUG_CMD, "sending STOP");
613	gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
614}
615
616/**
617 * gigaset_isdn_regdev() - register to LL
618 * @cs:		device descriptor structure.
619 * @isdnid:	device name.
620 *
621 * Return value: 1 for success, 0 for failure
622 */
623int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
624{
625	isdn_if *iif;
626
627	iif = kmalloc(sizeof *iif, GFP_KERNEL);
628	if (!iif) {
629		pr_err("out of memory\n");
630		return 0;
631	}
632
633	if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
634	    >= sizeof iif->id) {
635		pr_err("ID too long: %s\n", isdnid);
636		kfree(iif);
637		return 0;
638	}
639
640	iif->owner = THIS_MODULE;
641	iif->channels = cs->channels;
642	iif->maxbufsize = MAX_BUF_SIZE;
643	iif->features = ISDN_FEATURE_L2_TRANS |
644		ISDN_FEATURE_L2_HDLC |
645		ISDN_FEATURE_L2_X75I |
646		ISDN_FEATURE_L3_TRANS |
647		ISDN_FEATURE_P_EURO;
648	iif->hl_hdrlen = HW_HDR_LEN;		/* Area for storing ack */
649	iif->command = command_from_LL;
650	iif->writebuf_skb = writebuf_from_LL;
651	iif->writecmd = NULL;			/* Don't support isdnctrl */
652	iif->readstat = NULL;			/* Don't support isdnctrl */
653	iif->rcvcallb_skb = NULL;		/* Will be set by LL */
654	iif->statcallb = NULL;			/* Will be set by LL */
655
656	if (!register_isdn(iif)) {
657		pr_err("register_isdn failed\n");
658		kfree(iif);
659		return 0;
660	}
661
662	cs->iif = iif;
663	cs->myid = iif->channels;		/* Set my device id */
664	cs->hw_hdr_len = HW_HDR_LEN;
665	return 1;
666}
667
668/**
669 * gigaset_isdn_unregdev() - unregister device from LL
670 * @cs:		device descriptor structure.
671 */
672void gigaset_isdn_unregdev(struct cardstate *cs)
673{
674	gig_dbg(DEBUG_CMD, "sending UNLOAD");
675	gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
676	kfree(cs->iif);
677	cs->iif = NULL;
678}
679
680/**
681 * gigaset_isdn_regdrv() - register driver to LL
682 */
683void gigaset_isdn_regdrv(void)
684{
685	pr_info("ISDN4Linux interface\n");
686	/* nothing to do */
687}
688
689/**
690 * gigaset_isdn_unregdrv() - unregister driver from LL
691 */
692void gigaset_isdn_unregdrv(void)
693{
694	/* nothing to do */
695}
696