summaryrefslogtreecommitdiff
path: root/drivers/w1/dscore.c
blob: b9146306df49a94df1b6443baa48a9fb17417ce3 (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
/*
 *	dscore.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 *
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/usb.h>

#include "dscore.h"

static struct usb_device_id ds_id_table [] = {
	{ USB_DEVICE(0x04fa, 0x2490) },
	{ },
};
MODULE_DEVICE_TABLE(usb, ds_id_table);

static int ds_probe(struct usb_interface *, const struct usb_device_id *);
static void ds_disconnect(struct usb_interface *);

int ds_touch_bit(struct ds_device *, u8, u8 *);
int ds_read_byte(struct ds_device *, u8 *);
int ds_read_bit(struct ds_device *, u8 *);
int ds_write_byte(struct ds_device *, u8);
int ds_write_bit(struct ds_device *, u8);
static int ds_start_pulse(struct ds_device *, int);
int ds_reset(struct ds_device *, struct ds_status *);
struct ds_device * ds_get_device(void);
void ds_put_device(struct ds_device *);

static inline void ds_dump_status(unsigned char *, unsigned char *, int);
static int ds_send_control(struct ds_device *, u16, u16);
static int ds_send_control_mode(struct ds_device *, u16, u16);
static int ds_send_control_cmd(struct ds_device *, u16, u16);


static struct usb_driver ds_driver = {
	.name =		"DS9490R",
	.probe =	ds_probe,
	.disconnect =	ds_disconnect,
	.id_table =	ds_id_table,
};

static struct ds_device *ds_dev;

struct ds_device * ds_get_device(void)
{
	if (ds_dev)
		atomic_inc(&ds_dev->refcnt);
	return ds_dev;
}

void ds_put_device(struct ds_device *dev)
{
	atomic_dec(&dev->refcnt);
}

static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			MODE_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
{
	int err;

	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
			COMM_CMD, 0x40, value, index, NULL, 0, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
				value, index, err);
		return err;
	}

	return err;
}

static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off)
{
	printk("%45s: %8x\n", str, buf[off]);
}

static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
				 unsigned char *buf, int size)
{
	int count, err;

	memset(st, 0, sizeof(st));

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
	if (err < 0) {
		printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
		return err;
	}

	if (count >= sizeof(*st))
		memcpy(st, buf, sizeof(*st));

	return count;
}

static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
{
	unsigned char buf[64];
	int count, err = 0, i;

	memcpy(st, buf, sizeof(*st));

	count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
	if (count < 0)
		return err;

	printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
	for (i=0; i<count; ++i)
		printk("%02x ", buf[i]);
	printk("\n");

	if (count >= 16) {
		ds_dump_status(buf, "enable flag", 0);
		ds_dump_status(buf, "1-wire speed", 1);
		ds_dump_status(buf, "strong pullup duration", 2);
		ds_dump_status(buf, "programming pulse duration", 3);
		ds_dump_status(buf, "pulldown slew rate control", 4);
		ds_dump_status(buf, "write-1 low time", 5);
		ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
		ds_dump_status(buf, "reserved (test register)", 7);
		ds_dump_status(buf, "device status flags", 8);
		ds_dump_status(buf, "communication command byte 1", 9);
		ds_dump_status(buf, "communication command byte 2", 10);
		ds_dump_status(buf, "communication command buffer status", 11);
		ds_dump_status(buf, "1-wire data output buffer status", 12);
		ds_dump_status(buf, "1-wire data input buffer status", 13);
		ds_dump_status(buf, "reserved", 14);
		ds_dump_status(buf, "reserved", 15);
	}

	memcpy(st, buf, sizeof(*st));

	if (st->status & ST_EPOF) {
		printk(KERN_INFO "Resetting device after ST_EPOF.\n");
		err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
		if (err)
			return err;
		count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
		if (count < 0)
			return err;
	}
#if 0
	if (st->status & ST_IDLE) {
		printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
		err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
		if (err)
			return err;
	}
#endif

	return err;
}

static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
{
	int count, err;
	struct ds_status st;

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
				buf, size, &count, 1000);
	if (err < 0) {
		printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
		usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
		ds_recv_status(dev, &st);
		return err;
	}

#if 0
	{
		int i;

		printk("%s: count=%d: ", __func__, count);
		for (i=0; i<count; ++i)
			printk("%02x ", buf[i]);
		printk("\n");
	}
#endif
	return count;
}

static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
{
	int count, err;

	count = 0;
	err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
	if (err < 0) {
		printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err);
		return err;
	}

	return err;
}

#if 0

int ds_stop_pulse(struct ds_device *dev, int limit)
{
	struct ds_status st;
	int count = 0, err = 0;
	u8 buf[0x20];

	do {
		err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
		if (err)
			break;
		err = ds_send_control(dev, CTL_RESUME_EXE, 0);
		if (err)
			break;
		err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
		if (err)
			break;

		if ((st.status & ST_SPUA) == 0) {
			err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
			if (err)
				break;
		}
	} while(++count < limit);

	return err;
}

int ds_detect(struct ds_device *dev, struct ds_status *st)
{
	int err;

	err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
	if (err)
		return err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
	if (err)
		return err;

	err = ds_recv_status(dev, st);

	return err;
}

#endif  /*  0  */

static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
{
	u8 buf[0x20];
	int err, count = 0;

	do {
		err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
#if 0
		if (err >= 0) {
			int i;
			printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
			for (i=0; i<err; ++i)
				printk("%02x ", buf[i]);
			printk("\n");
		}
#endif
	} while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);


	if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
		ds_recv_status(dev, st);
		return -1;
	} else
		return 0;
}

int ds_reset(struct ds_device *dev, struct ds_status *st)
{
	int err;

	//err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE);
	err = ds_send_control(dev, 0x43, SPEED_NORMAL);
	if (err)
		return err;

	ds_wait_status(dev, st);
#if 0
	if (st->command_buffer_status) {
		printk(KERN_INFO "Short circuit.\n");
		return -EIO;
	}
#endif
	
	return 0;
}

#if 0
int ds_set_speed(struct ds_device *dev, int speed)
{
	int err;
	
	if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
		return -EINVAL;

	if (speed != SPEED_OVERDRIVE)
		speed = SPEED_FLEXIBLE;

	speed &= 0xff;

	err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
	if (err)
		return err;

	return err;
}
#endif  /*  0  */

static int ds_start_pulse(struct ds_device *dev, int delay)
{
	int err;
	u8 del = 1 + (u8)(delay >> 4);
	struct ds_status st;

#if 0
	err = ds_stop_pulse(dev, 10);
	if (err)
		return err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	if (err)
		return err;
#endif
	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
	if (err)
		return err;

	mdelay(delay);

	ds_wait_status(dev, &st);

	return err;
}

int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
{
	int err, count;
	struct ds_status st;
	u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
	u16 cmd;

	err = ds_send_control(dev, value, 0);
	if (err)
		return err;

	count = 0;
	do {
		err = ds_wait_status(dev, &st);
		if (err)
			return err;

		cmd = st.command0 | (st.command1 << 8);
	} while (cmd != value && ++count < 10);

	if (err < 0 || count >= 10) {
		printk(KERN_ERR "Failed to obtain status.\n");
		return -EINVAL;
	}

	err = ds_recv_data(dev, tbit, sizeof(*tbit));
	if (err < 0)
		return err;

	return 0;
}

int ds_write_bit(struct ds_device *dev, u8 bit)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

int ds_write_byte(struct ds_device *dev, u8 byte)
{
	int err;
	struct ds_status st;
	u8 rbyte;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
	if (err)
		return err;

	err = ds_wait_status(dev, &st);
	if (err)
		return err;

	err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(byte == rbyte);
}

int ds_read_bit(struct ds_device *dev, u8 *bit)
{
	int err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_SPU | COMM_D, 0);
	if (err)
		return err;

	err = ds_recv_data(dev, bit, sizeof(*bit));
	if (err < 0)
		return err;

	return 0;
}

int ds_read_byte(struct ds_device *dev, u8 *byte)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, byte, sizeof(*byte));
	if (err < 0)
		return err;

	return 0;
}

int ds_read_block(struct ds_device *dev, u8 *buf, int len)
{
	struct ds_status st;
	int err;

	if (len > 64*1024)
		return -E2BIG;

	memset(buf, 0xFF, len);

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	memset(buf, 0x00, len);
	err = ds_recv_data(dev, buf, len);

	return err;
}

int ds_write_block(struct ds_device *dev, u8 *buf, int len)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(err == len);
}

#if 0

int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
{
	int err;
	u16 value, index;
	struct ds_status st;

	memset(buf, 0, sizeof(buf));

	err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
	index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
	err = ds_send_control(ds_dev, value, index);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
	if (err < 0)
		return err;

	return err/8;
}

int ds_match_access(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

int ds_set_path(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;
	u8 buf[9];

	memcpy(buf, &init, 8);
	buf[8] = BRANCH_MAIN;

	err = ds_send_data(dev, buf, sizeof(buf));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

#endif  /*  0  */

static int ds_probe(struct usb_interface *intf,
		    const struct usb_device_id *udev_id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct usb_host_interface *iface_desc;
	int i, err;

	ds_dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
	if (!ds_dev) {
		printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
		return -ENOMEM;
	}

	ds_dev->udev = usb_get_dev(udev);
	usb_set_intfdata(intf, ds_dev);

	err = usb_set_interface(ds_dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
	if (err) {
		printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
				intf->altsetting[0].desc.bInterfaceNumber, err);
		return err;
	}

	err = usb_reset_configuration(ds_dev->udev);
	if (err) {
		printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
		return err;
	}

	iface_desc = &intf->altsetting[0];
	if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
		printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
		return -ENODEV;
	}

	atomic_set(&ds_dev->refcnt, 0);
	memset(ds_dev->ep, 0, sizeof(ds_dev->ep));

	/*
	 * This loop doesn'd show control 0 endpoint,
	 * so we will fill only 1-3 endpoints entry.
	 */
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		ds_dev->ep[i+1] = endpoint->bEndpointAddress;

		printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
			i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
			(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
			endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
	}

#if 0
	{
		int err, i;
		u64 buf[3];
		u64 init=0xb30000002078ee81ull;
		struct ds_status st;

		ds_reset(ds_dev, &st);
		err = ds_search(ds_dev, init, buf, 3, 0);
		if (err < 0)
			return err;
		for (i=0; i<err; ++i)
			printk("%d: %llx\n", i, buf[i]);

		printk("Resetting...\n");
		ds_reset(ds_dev, &st);
		printk("Setting path for %llx.\n", init);
		err = ds_set_path(ds_dev, init);
		if (err)
			return err;
		printk("Calling MATCH_ACCESS.\n");
		err = ds_match_access(ds_dev, init);
		if (err)
			return err;

		printk("Searching the bus...\n");
		err = ds_search(ds_dev, init, buf, 3, 0);

		printk("ds_search() returned %d\n", err);

		if (err < 0)
			return err;
		for (i=0; i<err; ++i)
			printk("%d: %llx\n", i, buf[i]);

		return 0;
	}
#endif

	return 0;
}

static void ds_disconnect(struct usb_interface *intf)
{
	struct ds_device *dev;

	dev = usb_get_intfdata(intf);
	usb_set_intfdata(intf, NULL);

	while (atomic_read(&dev->refcnt)) {
		printk(KERN_INFO "Waiting for DS to become free: refcnt=%d.\n",
				atomic_read(&dev->refcnt));

		if (msleep_interruptible(1000))
			flush_signals(current);
	}

	usb_put_dev(dev->udev);
	kfree(dev);
	ds_dev = NULL;
}

static int ds_init(void)
{
	int err;

	err = usb_register(&ds_driver);
	if (err) {
		printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
		return err;
	}

	return 0;
}

static void ds_fini(void)
{
	usb_deregister(&ds_driver);
}

module_init(ds_init);
module_exit(ds_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");

EXPORT_SYMBOL(ds_touch_bit);
EXPORT_SYMBOL(ds_read_byte);
EXPORT_SYMBOL(ds_read_bit);
EXPORT_SYMBOL(ds_read_block);
EXPORT_SYMBOL(ds_write_byte);
EXPORT_SYMBOL(ds_write_bit);
EXPORT_SYMBOL(ds_write_block);
EXPORT_SYMBOL(ds_reset);
EXPORT_SYMBOL(ds_get_device);
EXPORT_SYMBOL(ds_put_device);

/*
 * This functions can be used for EEPROM programming,
 * when driver will be included into mainline this will
 * require uncommenting.
 */
#if 0
EXPORT_SYMBOL(ds_start_pulse);
EXPORT_SYMBOL(ds_set_speed);
EXPORT_SYMBOL(ds_detect);
EXPORT_SYMBOL(ds_stop_pulse);
EXPORT_SYMBOL(ds_search);
#endif