aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/gigaset/usb-gigaset.c
blob: 5e3300d8a2a5b227a70e632388cfaf6bad453414 (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
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
/*
 * USB driver for Gigaset 307x directly or using M105 Data.
 *
 * Copyright (c) 2001 by Stefan Eilers
 *                   and Hansjoerg Lipp <hjlipp@web.de>.
 *
 * This driver was derived from the USB skeleton driver by
 * Greg Kroah-Hartman <greg@kroah.com>
 *
 * =====================================================================
 *	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"
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

/* Version Information */
#define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
#define DRIVER_DESC "USB Driver for Gigaset 307x using M105"

/* Module parameters */

static int startmode = SM_ISDN;
static int cidmode = 1;

module_param(startmode, int, S_IRUGO);
module_param(cidmode, int, S_IRUGO);
MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
MODULE_PARM_DESC(cidmode, "Call-ID mode");

#define GIGASET_MINORS     1
#define GIGASET_MINOR      8
#define GIGASET_MODULENAME "usb_gigaset"
#define GIGASET_DEVNAME    "ttyGU"

/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264

/* Values for the Gigaset M105 Data */
#define USB_M105_VENDOR_ID	0x0681
#define USB_M105_PRODUCT_ID	0x0009

/* table of devices that work with this driver */
static const struct usb_device_id gigaset_table[] = {
	{ USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, gigaset_table);

/*
 * Control requests (empty fields: 00)
 *
 *       RT|RQ|VALUE|INDEX|LEN  |DATA
 * In:
 *       C1 08             01
 *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
 *       C1 0F             ll ll
 *            Get device information/status (llll: 0x200 and 0x40 seen).
 *            Real size: I only saw MIN(llll,0x64).
 *            Contents: seems to be always the same...
 *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
 *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
 *              rest:        ?
 * Out:
 *       41 11
 *            Initialize/reset device ?
 *       41 00 xx 00
 *            ? (xx=00 or 01; 01 on start, 00 on close)
 *       41 07 vv mm
 *            Set/clear flags vv=value, mm=mask (see RQ 08)
 *       41 12 xx
 *            Used before the following configuration requests are issued
 *            (with xx=0x0f). I've seen other values<0xf, though.
 *       41 01 xx xx
 *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
 *       41 03 ps bb
 *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
 *                                     [    0x30: m, 0x40: s           ]
 *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
 *                                      bb: bits/byte (seen 7 and 8)
 *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
 *            ??
 *            Initialization: 01, 40, 00, 00
 *            Open device:    00  40, 00, 00
 *            yy and zz seem to be equal, either 0x00 or 0x0a
 *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
 *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
 *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
 *            xx is usually 0x00 but was 0x7e before starting data transfer
 *            in unimodem mode. So, this might be an array of characters that
 *            need special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
 *
 * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
 * flags per packet.
 */

/* functions called if a device of this driver is connected/disconnected */
static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id);
static void gigaset_disconnect(struct usb_interface *interface);

/* functions called before/after suspend */
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
static int gigaset_resume(struct usb_interface *intf);
static int gigaset_pre_reset(struct usb_interface *intf);

static struct gigaset_driver *driver;

/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver gigaset_usb_driver = {
	.name =		GIGASET_MODULENAME,
	.probe =	gigaset_probe,
	.disconnect =	gigaset_disconnect,
	.id_table =	gigaset_table,
	.suspend =	gigaset_suspend,
	.resume =	gigaset_resume,
	.reset_resume =	gigaset_resume,
	.pre_reset =	gigaset_pre_reset,
	.post_reset =	gigaset_resume,
};

struct usb_cardstate {
	struct usb_device	*udev;		/* usb device pointer */
	struct usb_interface	*interface;	/* interface for this device */
	int			busy;		/* bulk output in progress */

	/* Output buffer */
	unsigned char		*bulk_out_buffer;
	int			bulk_out_size;
	__u8			bulk_out_endpointAddr;
	struct urb		*bulk_out_urb;

	/* Input buffer */
	unsigned char		*rcvbuf;
	int			rcvbuf_size;
	struct urb		*read_urb;
	__u8			int_in_endpointAddr;

	char			bchars[6];		/* for request 0x19 */
};

static inline unsigned tiocm_to_gigaset(unsigned state)
{
	return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
}

static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
				  unsigned new_state)
{
	struct usb_device *udev = cs->hw.usb->udev;
	unsigned mask, val;
	int r;

	mask = tiocm_to_gigaset(old_state ^ new_state);
	val = tiocm_to_gigaset(new_state);

	gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
			    (val & 0xff) | ((mask & 0xff) << 8), 0,
			    NULL, 0, 2000 /* timeout? */);
	if (r < 0)
		return r;
	return 0;
}

/*
 * Set M105 configuration value
 * using undocumented device commands reverse engineered from USB traces
 * of the Siemens Windows driver
 */
static int set_value(struct cardstate *cs, u8 req, u16 val)
{
	struct usb_device *udev = cs->hw.usb->udev;
	int r, r2;

	gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
		(unsigned)req, (unsigned)val);
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
			    0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
			    /* no idea what this does */
	if (r < 0) {
		dev_err(&udev->dev, "error %d on request 0x12\n", -r);
		return r;
	}

	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
			    val, 0, NULL, 0, 2000 /*?*/);
	if (r < 0)
		dev_err(&udev->dev, "error %d on request 0x%02x\n",
			-r, (unsigned)req);

	r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
			     0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
	if (r2 < 0)
		dev_err(&udev->dev, "error %d on request 0x19\n", -r2);

	return r < 0 ? r : (r2 < 0 ? r2 : 0);
}

/*
 * set the baud rate on the internal serial adapter
 * using the undocumented parameter setting command
 */
static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
{
	u16 val;
	u32 rate;

	cflag &= CBAUD;

	switch (cflag) {
	case    B300: rate =     300; break;
	case    B600: rate =     600; break;
	case   B1200: rate =    1200; break;
	case   B2400: rate =    2400; break;
	case   B4800: rate =    4800; break;
	case   B9600: rate =    9600; break;
	case  B19200: rate =   19200; break;
	case  B38400: rate =   38400; break;
	case  B57600: rate =   57600; break;
	case B115200: rate =  115200; break;
	default:
		rate =  9600;
		dev_err(cs->dev, "unsupported baudrate request 0x%x,"
			" using default of B9600\n", cflag);
	}

	val = 0x383fff / rate + 1;

	return set_value(cs, 1, val);
}

/*
 * set the line format on the internal serial adapter
 * using the undocumented parameter setting command
 */
static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
{
	u16 val = 0;

	/* set the parity */
	if (cflag & PARENB)
		val |= (cflag & PARODD) ? 0x10 : 0x20;

	/* set the number of data bits */
	switch (cflag & CSIZE) {
	case CS5:
		val |= 5 << 8; break;
	case CS6:
		val |= 6 << 8; break;
	case CS7:
		val |= 7 << 8; break;
	case CS8:
		val |= 8 << 8; break;
	default:
		dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
		val |= 8 << 8;
		break;
	}

	/* set the number of stop bits */
	if (cflag & CSTOPB) {
		if ((cflag & CSIZE) == CS5)
			val |= 1; /* 1.5 stop bits */
		else
			val |= 2; /* 2 stop bits */
	}

	return set_value(cs, 3, val);
}


/*============================================================================*/
static int gigaset_init_bchannel(struct bc_state *bcs)
{
	/* nothing to do for M10x */
	gigaset_bchannel_up(bcs);
	return 0;
}

static int gigaset_close_bchannel(struct bc_state *bcs)
{
	/* nothing to do for M10x */
	gigaset_bchannel_down(bcs);
	return 0;
}

static int write_modem(struct cardstate *cs);
static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);


/* Write tasklet handler: Continue sending current skb, or send command, or
 * start sending an skb from the send queue.
 */
static void gigaset_modem_fill(unsigned long data)
{
	struct cardstate *cs = (struct cardstate *) data;
	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
	struct cmdbuf_t *cb;
	int again;

	gig_dbg(DEBUG_OUTPUT, "modem_fill");

	if (cs->hw.usb->busy) {
		gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
		return;
	}

	do {
		again = 0;
		if (!bcs->tx_skb) { /* no skb is being sent */
			cb = cs->cmdbuf;
			if (cb) { /* commands to send? */
				gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
				if (send_cb(cs, cb) < 0) {
					gig_dbg(DEBUG_OUTPUT,
						"modem_fill: send_cb failed");
					again = 1; /* no callback will be
						      called! */
				}
			} else { /* skbs to send? */
				bcs->tx_skb = skb_dequeue(&bcs->squeue);
				if (bcs->tx_skb)
					gig_dbg(DEBUG_INTR,
						"Dequeued skb (Adr: %lx)!",
						(unsigned long) bcs->tx_skb);
			}
		}

		if (bcs->tx_skb) {
			gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
			if (write_modem(cs) < 0) {
				gig_dbg(DEBUG_OUTPUT,
					"modem_fill: write_modem failed");
				again = 1; /* no callback will be called! */
			}
		}
	} while (again);
}

/*
 * Interrupt Input URB completion routine
 */
static void gigaset_read_int_callback(struct urb *urb)
{
	struct cardstate *cs = urb->context;
	struct inbuf_t *inbuf = cs->inbuf;
	int status = urb->status;
	int r;
	unsigned numbytes;
	unsigned char *src;
	unsigned long flags;

	if (!status) {
		numbytes = urb->actual_length;

		if (numbytes) {
			src = cs->hw.usb->rcvbuf;
			if (unlikely(*src))
				dev_warn(cs->dev,
				    "%s: There was no leading 0, but 0x%02x!\n",
					 __func__, (unsigned) *src);
			++src; /* skip leading 0x00 */
			--numbytes;
			if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
				gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
				gigaset_schedule_event(inbuf->cs);
			}
		} else
			gig_dbg(DEBUG_INTR, "Received zero block length");
	} else {
		/* The urb might have been killed. */
		gig_dbg(DEBUG_ANY, "%s - nonzero status received: %d",
			__func__, status);
		if (status == -ENOENT || status == -ESHUTDOWN)
			/* killed or endpoint shutdown: don't resubmit */
			return;
	}

	/* resubmit URB */
	spin_lock_irqsave(&cs->lock, flags);
	if (!cs->connected) {
		spin_unlock_irqrestore(&cs->lock, flags);
		pr_err("%s: disconnected\n", __func__);
		return;
	}
	r = usb_submit_urb(urb, GFP_ATOMIC);
	spin_unlock_irqrestore(&cs->lock, flags);
	if (r)
		dev_err(cs->dev, "error %d resubmitting URB\n", -r);
}


/* This callback routine is called when data was transmitted to the device. */
static void gigaset_write_bulk_callback(struct urb *urb)
{
	struct cardstate *cs = urb->context;
	int status = urb->status;
	unsigned long flags;

	switch (status) {
	case 0:			/* normal completion */
		break;
	case -ENOENT:		/* killed */
		gig_dbg(DEBUG_ANY, "%s: killed", __func__);
		cs->hw.usb->busy = 0;
		return;
	default:
		dev_err(cs->dev, "bulk transfer failed (status %d)\n",
			-status);
		/* That's all we can do. Communication problems
		   are handled by timeouts or network protocols. */
	}

	spin_lock_irqsave(&cs->lock, flags);
	if (!cs->connected) {
		pr_err("%s: disconnected\n", __func__);
	} else {
		cs->hw.usb->busy = 0;
		tasklet_schedule(&cs->write_tasklet);
	}
	spin_unlock_irqrestore(&cs->lock, flags);
}

static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
{
	struct cmdbuf_t *tcb;
	unsigned long flags;
	int count;
	int status = -ENOENT;
	struct usb_cardstate *ucs = cs->hw.usb;

	do {
		if (!cb->len) {
			tcb = cb;

			spin_lock_irqsave(&cs->cmdlock, flags);
			cs->cmdbytes -= cs->curlen;
			gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
				cs->curlen, cs->cmdbytes);
			cs->cmdbuf = cb = cb->next;
			if (cb) {
				cb->prev = NULL;
				cs->curlen = cb->len;
			} else {
				cs->lastcmdbuf = NULL;
				cs->curlen = 0;
			}
			spin_unlock_irqrestore(&cs->cmdlock, flags);

			if (tcb->wake_tasklet)
				tasklet_schedule(tcb->wake_tasklet);
			kfree(tcb);
		}
		if (cb) {
			count = min(cb->len, ucs->bulk_out_size);
			gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);

			usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
					  usb_sndbulkpipe(ucs->udev,
					     ucs->bulk_out_endpointAddr & 0x0f),
					  cb->buf + cb->offset, count,
					  gigaset_write_bulk_callback, cs);

			cb->offset += count;
			cb->len -= count;
			ucs->busy = 1;

			spin_lock_irqsave(&cs->lock, flags);
			status = cs->connected ?
				usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) :
				-ENODEV;
			spin_unlock_irqrestore(&cs->lock, flags);

			if (status) {
				ucs->busy = 0;
				dev_err(cs->dev,
					"could not submit urb (error %d)\n",
					-status);
				cb->len = 0; /* skip urb => remove cb+wakeup
						in next loop cycle */
			}
		}
	} while (cb && status); /* next command on error */

	return status;
}

/* Send command to device. */
static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
{
	unsigned long flags;

	gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
			     DEBUG_TRANSCMD : DEBUG_LOCKCMD,
			   "CMD Transmit", cb->len, cb->buf);

	spin_lock_irqsave(&cs->cmdlock, flags);
	cb->prev = cs->lastcmdbuf;
	if (cs->lastcmdbuf)
		cs->lastcmdbuf->next = cb;
	else {
		cs->cmdbuf = cb;
		cs->curlen = cb->len;
	}
	cs->cmdbytes += cb->len;
	cs->lastcmdbuf = cb;
	spin_unlock_irqrestore(&cs->cmdlock, flags);

	spin_lock_irqsave(&cs->lock, flags);
	if (cs->connected)
		tasklet_schedule(&cs->write_tasklet);
	spin_unlock_irqrestore(&cs->lock, flags);
	return cb->len;
}

static int gigaset_write_room(struct cardstate *cs)
{
	unsigned bytes;

	bytes = cs->cmdbytes;
	return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
}

static int gigaset_chars_in_buffer(struct cardstate *cs)
{
	return cs->cmdbytes;
}

/*
 * set the break characters on the internal serial adapter
 * using undocumented device commands reverse engineered from USB traces
 * of the Siemens Windows driver
 */
static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
{
	struct usb_device *udev = cs->hw.usb->udev;

	gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
	memcpy(cs->hw.usb->bchars, buf, 6);
	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
			       0, 0, &buf, 6, 2000);
}

static int gigaset_freebcshw(struct bc_state *bcs)
{
	/* unused */
	return 1;
}

/* Initialize the b-channel structure */
static int gigaset_initbcshw(struct bc_state *bcs)
{
	/* unused */
	bcs->hw.usb = NULL;
	return 1;
}

static void gigaset_reinitbcshw(struct bc_state *bcs)
{
	/* nothing to do for M10x */
}

static void gigaset_freecshw(struct cardstate *cs)
{
	tasklet_kill(&cs->write_tasklet);
	kfree(cs->hw.usb);
}

static int gigaset_initcshw(struct cardstate *cs)
{
	struct usb_cardstate *ucs;

	cs->hw.usb = ucs =
		kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
	if (!ucs) {
		pr_err("out of memory\n");
		return 0;
	}

	ucs->bchars[0] = 0;
	ucs->bchars[1] = 0;
	ucs->bchars[2] = 0;
	ucs->bchars[3] = 0;
	ucs->bchars[4] = 0x11;
	ucs->bchars[5] = 0x13;
	ucs->bulk_out_buffer = NULL;
	ucs->bulk_out_urb = NULL;
	ucs->read_urb = NULL;
	tasklet_init(&cs->write_tasklet,
		     gigaset_modem_fill, (unsigned long) cs);

	return 1;
}

/* Send data from current skb to the device. */
static int write_modem(struct cardstate *cs)
{
	int ret = 0;
	int count;
	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
	struct usb_cardstate *ucs = cs->hw.usb;
	unsigned long flags;

	gig_dbg(DEBUG_OUTPUT, "len: %d...", bcs->tx_skb->len);

	if (!bcs->tx_skb->len) {
		dev_kfree_skb_any(bcs->tx_skb);
		bcs->tx_skb = NULL;
		return -EINVAL;
	}

	/* Copy data to bulk out buffer and transmit data */
	count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
	skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
	skb_pull(bcs->tx_skb, count);
	ucs->busy = 1;
	gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);

	spin_lock_irqsave(&cs->lock, flags);
	if (cs->connected) {
		usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
				  usb_sndbulkpipe(ucs->udev,
						  ucs->bulk_out_endpointAddr &
						  0x0f),
				  ucs->bulk_out_buffer, count,
				  gigaset_write_bulk_callback, cs);
		ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
	} else {
		ret = -ENODEV;
	}
	spin_unlock_irqrestore(&cs->lock, flags);

	if (ret) {
		dev_err(cs->dev, "could not submit urb (error %d)\n", -ret);
		ucs->busy = 0;
	}

	if (!bcs->tx_skb->len) {
		/* skb sent completely */
		gigaset_skb_sent(bcs, bcs->tx_skb);

		gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
			(unsigned long) bcs->tx_skb);
		dev_kfree_skb_any(bcs->tx_skb);
		bcs->tx_skb = NULL;
	}

	return ret;
}

static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id)
{
	int retval;
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_host_interface *hostif = interface->cur_altsetting;
	struct cardstate *cs = NULL;
	struct usb_cardstate *ucs = NULL;
	struct usb_endpoint_descriptor *endpoint;
	int buffer_size;

	gig_dbg(DEBUG_ANY, "%s: Check if device matches ...", __func__);

	/* See if the device offered us matches what we can accept */
	if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
	    (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID)) {
		gig_dbg(DEBUG_ANY, "device ID (0x%x, 0x%x) not for me - skip",
			le16_to_cpu(udev->descriptor.idVendor),
			le16_to_cpu(udev->descriptor.idProduct));
		return -ENODEV;
	}
	if (hostif->desc.bInterfaceNumber != 0) {
		gig_dbg(DEBUG_ANY, "interface %d not for me - skip",
			hostif->desc.bInterfaceNumber);
		return -ENODEV;
	}
	if (hostif->desc.bAlternateSetting != 0) {
		dev_notice(&udev->dev, "unsupported altsetting %d - skip",
			   hostif->desc.bAlternateSetting);
		return -ENODEV;
	}
	if (hostif->desc.bInterfaceClass != 255) {
		dev_notice(&udev->dev, "unsupported interface class %d - skip",
			   hostif->desc.bInterfaceClass);
		return -ENODEV;
	}

	dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);

	/* allocate memory for our device state and initialize it */
	cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
	if (!cs)
		return -ENODEV;
	ucs = cs->hw.usb;

	/* save off device structure ptrs for later use */
	usb_get_dev(udev);
	ucs->udev = udev;
	ucs->interface = interface;
	cs->dev = &interface->dev;

	/* save address of controller structure */
	usb_set_intfdata(interface, cs);

	endpoint = &hostif->endpoint[0].desc;

	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	ucs->bulk_out_size = buffer_size;
	ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
	if (!ucs->bulk_out_buffer) {
		dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
		retval = -ENOMEM;
		goto error;
	}

	ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!ucs->bulk_out_urb) {
		dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
		retval = -ENOMEM;
		goto error;
	}

	endpoint = &hostif->endpoint[1].desc;

	ucs->busy = 0;

	ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!ucs->read_urb) {
		dev_err(cs->dev, "No free urbs available\n");
		retval = -ENOMEM;
		goto error;
	}
	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	ucs->rcvbuf_size = buffer_size;
	ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
	ucs->rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
	if (!ucs->rcvbuf) {
		dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
		retval = -ENOMEM;
		goto error;
	}
	/* Fill the interrupt urb and send it to the core */
	usb_fill_int_urb(ucs->read_urb, udev,
			 usb_rcvintpipe(udev,
					endpoint->bEndpointAddress & 0x0f),
			 ucs->rcvbuf, buffer_size,
			 gigaset_read_int_callback,
			 cs, endpoint->bInterval);

	retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
	if (retval) {
		dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
		goto error;
	}

	/* tell common part that the device is ready */
	if (startmode == SM_LOCKED)
		cs->mstate = MS_LOCKED;

	if (!gigaset_start(cs)) {
		tasklet_kill(&cs->write_tasklet);
		retval = -ENODEV;
		goto error;
	}
	return 0;

error:
	usb_kill_urb(ucs->read_urb);
	kfree(ucs->bulk_out_buffer);
	usb_free_urb(ucs->bulk_out_urb);
	kfree(ucs->rcvbuf);
	usb_free_urb(ucs->read_urb);
	usb_set_intfdata(interface, NULL);
	ucs->read_urb = ucs->bulk_out_urb = NULL;
	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
	usb_put_dev(ucs->udev);
	ucs->udev = NULL;
	ucs->interface = NULL;
	gigaset_freecs(cs);
	return retval;
}

static void gigaset_disconnect(struct usb_interface *interface)
{
	struct cardstate *cs;
	struct usb_cardstate *ucs;

	cs = usb_get_intfdata(interface);
	ucs = cs->hw.usb;

	dev_info(cs->dev, "disconnecting Gigaset USB adapter\n");

	usb_kill_urb(ucs->read_urb);

	gigaset_stop(cs);

	usb_set_intfdata(interface, NULL);
	tasklet_kill(&cs->write_tasklet);

	usb_kill_urb(ucs->bulk_out_urb);

	kfree(ucs->bulk_out_buffer);
	usb_free_urb(ucs->bulk_out_urb);
	kfree(ucs->rcvbuf);
	usb_free_urb(ucs->read_urb);
	ucs->read_urb = ucs->bulk_out_urb = NULL;
	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;

	usb_put_dev(ucs->udev);
	ucs->interface = NULL;
	ucs->udev = NULL;
	cs->dev = NULL;
	gigaset_freecs(cs);
}

/* gigaset_suspend
 * This function is called before the USB connection is suspended or reset.
 */
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct cardstate *cs = usb_get_intfdata(intf);

	/* stop activity */
	cs->connected = 0;	/* prevent rescheduling */
	usb_kill_urb(cs->hw.usb->read_urb);
	tasklet_kill(&cs->write_tasklet);
	usb_kill_urb(cs->hw.usb->bulk_out_urb);

	gig_dbg(DEBUG_SUSPEND, "suspend complete");
	return 0;
}

/* gigaset_resume
 * This function is called after the USB connection has been resumed or reset.
 */
static int gigaset_resume(struct usb_interface *intf)
{
	struct cardstate *cs = usb_get_intfdata(intf);
	int rc;

	/* resubmit interrupt URB */
	cs->connected = 1;
	rc = usb_submit_urb(cs->hw.usb->read_urb, GFP_KERNEL);
	if (rc) {
		dev_err(cs->dev, "Could not submit read URB (error %d)\n", -rc);
		return rc;
	}

	gig_dbg(DEBUG_SUSPEND, "resume complete");
	return 0;
}

/* gigaset_pre_reset
 * This function is called before the USB connection is reset.
 */
static int gigaset_pre_reset(struct usb_interface *intf)
{
	/* same as suspend */
	return gigaset_suspend(intf, PMSG_ON);
}

static const struct gigaset_ops ops = {
	gigaset_write_cmd,
	gigaset_write_room,
	gigaset_chars_in_buffer,
	gigaset_brkchars,
	gigaset_init_bchannel,
	gigaset_close_bchannel,
	gigaset_initbcshw,
	gigaset_freebcshw,
	gigaset_reinitbcshw,
	gigaset_initcshw,
	gigaset_freecshw,
	gigaset_set_modem_ctrl,
	gigaset_baud_rate,
	gigaset_set_line_ctrl,
	gigaset_m10x_send_skb,
	gigaset_m10x_input,
};

/*
 * This function is called while kernel-module is loaded
 */
static int __init usb_gigaset_init(void)
{
	int result;

	/* allocate memory for our driver state and initialize it */
	driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
				    GIGASET_MODULENAME, GIGASET_DEVNAME,
				    &ops, THIS_MODULE);
	if (driver == NULL)
		goto error;

	/* register this driver with the USB subsystem */
	result = usb_register(&gigaset_usb_driver);
	if (result < 0) {
		pr_err("error %d registering USB driver\n", -result);
		goto error;
	}

	pr_info(DRIVER_DESC "\n");
	return 0;

error:
	if (driver)
		gigaset_freedriver(driver);
	driver = NULL;
	return -1;
}

/*
 * This function is called while unloading the kernel-module
 */
static void __exit usb_gigaset_exit(void)
{
	int i;

	gigaset_blockdriver(driver); /* => probe will fail
				      * => no gigaset_start any more
				      */

	/* stop all connected devices */
	for (i = 0; i < driver->minors; i++)
		gigaset_shutdown(driver->cs + i);

	/* from now on, no isdn callback should be possible */

	/* deregister this driver with the USB subsystem */
	usb_deregister(&gigaset_usb_driver);
	/* this will call the disconnect-callback */
	/* from now on, no disconnect/probe callback should be running */

	gigaset_freedriver(driver);
	driver = NULL;
}


module_init(usb_gigaset_init);
module_exit(usb_gigaset_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");