summaryrefslogtreecommitdiff
path: root/drivers/usb/atm/speedtch.c
blob: 233f9229badb66c23131de8b8c6b36ef8d24d7b0 (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
/******************************************************************************
 *  speedtch.c  -  Alcatel SpeedTouch USB xDSL modem driver
 *
 *  Copyright (C) 2001, Alcatel
 *  Copyright (C) 2003, Duncan Sands
 *  Copyright (C) 2004, David Woodhouse
 *
 *  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/moduleparam.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/crc32.h>
#include <linux/init.h>
#include <linux/firmware.h>

#include "usb_atm.h"

#if defined(CONFIG_FW_LOADER) || defined(CONFIG_FW_LOADER_MODULE)
#	define USE_FW_LOADER
#endif

#define DRIVER_AUTHOR	"Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
#define DRIVER_VERSION	"1.8"
#define DRIVER_DESC	"Alcatel SpeedTouch USB driver version " DRIVER_VERSION

static const char speedtch_driver_name[] = "speedtch";

#define SPEEDTOUCH_VENDORID		0x06b9
#define SPEEDTOUCH_PRODUCTID		0x4061

/* Timeout in jiffies */
#define CTRL_TIMEOUT 2000
#define DATA_TIMEOUT 2000

#define OFFSET_7  0		/* size 1 */
#define OFFSET_b  1		/* size 8 */
#define OFFSET_d  9		/* size 4 */
#define OFFSET_e 13		/* size 1 */
#define OFFSET_f 14		/* size 1 */
#define TOTAL    15

#define SIZE_7 1
#define SIZE_b 8
#define SIZE_d 4
#define SIZE_e 1
#define SIZE_f 1

static int dl_512_first = 0;
static int sw_buffering = 0;

module_param(dl_512_first, bool, 0444);
MODULE_PARM_DESC(dl_512_first, "Read 512 bytes before sending firmware");

module_param(sw_buffering, uint, 0444);
MODULE_PARM_DESC(sw_buffering, "Enable software buffering");

#define UDSL_IOCTL_LINE_UP		1
#define UDSL_IOCTL_LINE_DOWN		2

#define SPEEDTCH_ENDPOINT_INT		0x81
#define SPEEDTCH_ENDPOINT_DATA		0x07
#define SPEEDTCH_ENDPOINT_FIRMWARE	0x05

#define hex2int(c) ( (c >= '0') && (c <= '9') ? (c - '0') : ((c & 0xf) + 9) )

static struct usb_device_id speedtch_usb_ids[] = {
	{USB_DEVICE(SPEEDTOUCH_VENDORID, SPEEDTOUCH_PRODUCTID)},
	{}
};

MODULE_DEVICE_TABLE(usb, speedtch_usb_ids);

struct speedtch_instance_data {
	struct udsl_instance_data u;

	/* Status */
	struct urb *int_urb;
	unsigned char int_data[16];
	struct work_struct poll_work;
	struct timer_list poll_timer;
};
/* USB */

static int speedtch_usb_probe(struct usb_interface *intf,
			      const struct usb_device_id *id);
static void speedtch_usb_disconnect(struct usb_interface *intf);
static int speedtch_usb_ioctl(struct usb_interface *intf, unsigned int code,
			      void *user_data);
static void speedtch_handle_int(struct urb *urb, struct pt_regs *regs);
static void speedtch_poll_status(struct speedtch_instance_data *instance);

static struct usb_driver speedtch_usb_driver = {
	.owner		= THIS_MODULE,
	.name		= speedtch_driver_name,
	.probe		= speedtch_usb_probe,
	.disconnect	= speedtch_usb_disconnect,
	.ioctl		= speedtch_usb_ioctl,
	.id_table	= speedtch_usb_ids,
};

/***************
**  firmware  **
***************/

static void speedtch_got_firmware(struct speedtch_instance_data *instance,
				  int got_it)
{
	int err;
	struct usb_interface *intf;

	down(&instance->u.serialize);	/* vs self, speedtch_firmware_start */
	if (instance->u.status == UDSL_LOADED_FIRMWARE)
		goto out;
	if (!got_it) {
		instance->u.status = UDSL_NO_FIRMWARE;
		goto out;
	}
	if ((err = usb_set_interface(instance->u.usb_dev, 1, 1)) < 0) {
		dbg("speedtch_got_firmware: usb_set_interface returned %d!", err);
		instance->u.status = UDSL_NO_FIRMWARE;
		goto out;
	}

	/* Set up interrupt endpoint */
	intf = usb_ifnum_to_if(instance->u.usb_dev, 0);
	if (intf && !usb_driver_claim_interface(&speedtch_usb_driver, intf, NULL)) {

		instance->int_urb = usb_alloc_urb(0, GFP_KERNEL);
		if (instance->int_urb) {

			usb_fill_int_urb(instance->int_urb, instance->u.usb_dev,
					 usb_rcvintpipe(instance->u.usb_dev, SPEEDTCH_ENDPOINT_INT),
					 instance->int_data,
					 sizeof(instance->int_data),
					 speedtch_handle_int, instance, 50);
			err = usb_submit_urb(instance->int_urb, GFP_KERNEL);
			if (err) {
				/* Doesn't matter; we'll poll anyway */
				dbg("speedtch_got_firmware: Submission of interrupt URB failed %d", err);
				usb_free_urb(instance->int_urb);
				instance->int_urb = NULL;
				usb_driver_release_interface(&speedtch_usb_driver, intf);
			}
		}
	}
	/* Start status polling */
	mod_timer(&instance->poll_timer, jiffies + (1 * HZ));

	instance->u.status = UDSL_LOADED_FIRMWARE;
	tasklet_schedule(&instance->u.receive_tasklet);
 out:
	up(&instance->u.serialize);
	wake_up_interruptible(&instance->u.firmware_waiters);
}

static int speedtch_set_swbuff(struct speedtch_instance_data *instance,
			       int state)
{
	struct usb_device *dev = instance->u.usb_dev;
	int ret;

	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0x32, 0x40, state ? 0x01 : 0x00,
			      0x00, NULL, 0, 100);
	if (ret < 0) {
		printk("Warning: %sabling SW buffering: usb_control_msg returned %d\n",
		     state ? "En" : "Dis", ret);
		return ret;
	}

	dbg("speedtch_set_swbuff: %sbled SW buffering", state ? "En" : "Dis");
	return 0;
}

static void speedtch_test_sequence(struct speedtch_instance_data *instance)
{
	struct usb_device *dev = instance->u.usb_dev;
	unsigned char buf[10];
	int ret;

	/* URB 147 */
	buf[0] = 0x1c;
	buf[1] = 0x50;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0x01, 0x40, 0x0b, 0x00, buf, 2, 100);
	if (ret < 0)
		printk(KERN_WARNING "%s failed on URB147: %d\n", __func__, ret);

	/* URB 148 */
	buf[0] = 0x32;
	buf[1] = 0x00;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0x01, 0x40, 0x02, 0x00, buf, 2, 100);
	if (ret < 0)
		printk(KERN_WARNING "%s failed on URB148: %d\n", __func__, ret);

	/* URB 149 */
	buf[0] = 0x01;
	buf[1] = 0x00;
	buf[2] = 0x01;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0x01, 0x40, 0x03, 0x00, buf, 3, 100);
	if (ret < 0)
		printk(KERN_WARNING "%s failed on URB149: %d\n", __func__, ret);

	/* URB 150 */
	buf[0] = 0x01;
	buf[1] = 0x00;
	buf[2] = 0x01;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0x01, 0x40, 0x04, 0x00, buf, 3, 100);
	if (ret < 0)
		printk(KERN_WARNING "%s failed on URB150: %d\n", __func__, ret);
}

static int speedtch_start_synchro(struct speedtch_instance_data *instance)
{
	struct usb_device *dev = instance->u.usb_dev;
	unsigned char buf[2];
	int ret;

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x12, 0xc0, 0x04, 0x00,
			      buf, sizeof(buf), CTRL_TIMEOUT);
	if (ret < 0) {
		printk(KERN_WARNING "SpeedTouch: Failed to start ADSL synchronisation: %d\n", ret);
		return ret;
	}

	dbg("speedtch_start_synchro: modem prodded. %d Bytes returned: %02x %02x", ret, buf[0], buf[1]);
	return 0;
}

static void speedtch_handle_int(struct urb *urb, struct pt_regs *regs)
{
	struct speedtch_instance_data *instance = urb->context;
	unsigned int count = urb->actual_length;
	int ret;

	/* The magic interrupt for "up state" */
	const static unsigned char up_int[6]   = { 0xa1, 0x00, 0x01, 0x00, 0x00, 0x00 };
	/* The magic interrupt for "down state" */
	const static unsigned char down_int[6] = { 0xa1, 0x00, 0x00, 0x00, 0x00, 0x00 };

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated; clean up */
		dbg("%s - urb shutting down with status: %d", __func__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d", __func__, urb->status);
		goto exit;
	}

	if (count < 6) {
		dbg("%s - int packet too short", __func__);
		goto exit;
	}

	if (!memcmp(up_int, instance->int_data, 6)) {
		del_timer(&instance->poll_timer);
		printk(KERN_NOTICE "DSL line goes up\n");
	} else if (!memcmp(down_int, instance->int_data, 6)) {
		printk(KERN_NOTICE "DSL line goes down\n");
	} else {
		int i;

		printk(KERN_DEBUG "Unknown interrupt packet of %d bytes:", count);
		for (i = 0; i < count; i++)
			printk(" %02x", instance->int_data[i]);
		printk("\n");
	}
	schedule_work(&instance->poll_work);

 exit:
	rmb();
	if (!instance->int_urb)
		return;

	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret)
		err("%s - usb_submit_urb failed with result %d", __func__, ret);
}

static int speedtch_get_status(struct speedtch_instance_data *instance,
			       unsigned char *buf)
{
	struct usb_device *dev = instance->u.usb_dev;
	int ret;

	memset(buf, 0, TOTAL);

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x12, 0xc0, 0x07, 0x00, buf + OFFSET_7, SIZE_7,
			      CTRL_TIMEOUT);
	if (ret < 0) {
		dbg("MSG 7 failed");
		return ret;
	}

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x12, 0xc0, 0x0b, 0x00, buf + OFFSET_b, SIZE_b,
			      CTRL_TIMEOUT);
	if (ret < 0) {
		dbg("MSG B failed");
		return ret;
	}

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x12, 0xc0, 0x0d, 0x00, buf + OFFSET_d, SIZE_d,
			      CTRL_TIMEOUT);
	if (ret < 0) {
		dbg("MSG D failed");
		return ret;
	}

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x01, 0xc0, 0x0e, 0x00, buf + OFFSET_e, SIZE_e,
			      CTRL_TIMEOUT);
	if (ret < 0) {
		dbg("MSG E failed");
		return ret;
	}

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x01, 0xc0, 0x0f, 0x00, buf + OFFSET_f, SIZE_f,
			      CTRL_TIMEOUT);
	if (ret < 0) {
		dbg("MSG F failed");
		return ret;
	}

	return 0;
}

static void speedtch_poll_status(struct speedtch_instance_data *instance)
{
	unsigned char buf[TOTAL];
	int ret;

	ret = speedtch_get_status(instance, buf);
	if (ret) {
		printk(KERN_WARNING
		       "SpeedTouch: Error %d fetching device status\n", ret);
		return;
	}

	dbg("Line state %02x", buf[OFFSET_7]);

	switch (buf[OFFSET_7]) {
	case 0:
		if (instance->u.atm_dev->signal != ATM_PHY_SIG_LOST) {
			instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
			printk(KERN_NOTICE "ADSL line is down\n");
		}
		break;

	case 0x08:
		if (instance->u.atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
			instance->u.atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
			printk(KERN_NOTICE "ADSL line is blocked?\n");
		}
		break;

	case 0x10:
		if (instance->u.atm_dev->signal != ATM_PHY_SIG_LOST) {
			instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
			printk(KERN_NOTICE "ADSL line is synchronising\n");
		}
		break;

	case 0x20:
		if (instance->u.atm_dev->signal != ATM_PHY_SIG_FOUND) {
			int down_speed = buf[OFFSET_b] | (buf[OFFSET_b + 1] << 8)
				| (buf[OFFSET_b + 2] << 16) | (buf[OFFSET_b + 3] << 24);
			int up_speed = buf[OFFSET_b + 4] | (buf[OFFSET_b + 5] << 8)
				| (buf[OFFSET_b + 6] << 16) | (buf[OFFSET_b + 7] << 24);

			if (!(down_speed & 0x0000ffff) &&
			    !(up_speed & 0x0000ffff)) {
				down_speed >>= 16;
				up_speed >>= 16;
			}
			instance->u.atm_dev->link_rate = down_speed * 1000 / 424;
			instance->u.atm_dev->signal = ATM_PHY_SIG_FOUND;

			printk(KERN_NOTICE
			       "ADSL line is up (%d Kib/s down | %d Kib/s up)\n",
			       down_speed, up_speed);
		}
		break;

	default:
		if (instance->u.atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
			instance->u.atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
			printk(KERN_NOTICE "Unknown line state %02x\n", buf[OFFSET_7]);
		}
		break;
	}
}

static void speedtch_timer_poll(unsigned long data)
{
	struct speedtch_instance_data *instance = (void *)data;

	schedule_work(&instance->poll_work);
	mod_timer(&instance->poll_timer, jiffies + (5 * HZ));
}

#ifdef USE_FW_LOADER
static void speedtch_upload_firmware(struct speedtch_instance_data *instance,
				     const struct firmware *fw1,
				     const struct firmware *fw2)
{
	unsigned char *buffer;
	struct usb_device *usb_dev = instance->u.usb_dev;
	struct usb_interface *intf;
	int actual_length, ret;
	int offset;

	dbg("speedtch_upload_firmware");

	if (!(intf = usb_ifnum_to_if(usb_dev, 2))) {
		dbg("speedtch_upload_firmware: interface not found!");
		goto fail;
	}

	if (!(buffer = (unsigned char *)__get_free_page(GFP_KERNEL))) {
		dbg("speedtch_upload_firmware: no memory for buffer!");
		goto fail;
	}

	/* A user-space firmware loader may already have claimed interface #2 */
	if ((ret =
	     usb_driver_claim_interface(&speedtch_usb_driver, intf, NULL)) < 0) {
		dbg("speedtch_upload_firmware: interface in use (%d)!", ret);
		goto fail_free;
	}

	/* URB 7 */
	if (dl_512_first) {	/* some modems need a read before writing the firmware */
		ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
				   buffer, 0x200, &actual_length, 2000);

		if (ret < 0 && ret != -ETIMEDOUT)
			dbg("speedtch_upload_firmware: read BLOCK0 from modem failed (%d)!", ret);
		else
			dbg("speedtch_upload_firmware: BLOCK0 downloaded (%d bytes)", ret);
	}

	/* URB 8 : both leds are static green */
	for (offset = 0; offset < fw1->size; offset += PAGE_SIZE) {
		int thislen = min_t(int, PAGE_SIZE, fw1->size - offset);
		memcpy(buffer, fw1->data + offset, thislen);

		ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
				   buffer, thislen, &actual_length, DATA_TIMEOUT);

		if (ret < 0) {
			dbg("speedtch_upload_firmware: write BLOCK1 to modem failed (%d)!", ret);
			goto fail_release;
		}
		dbg("speedtch_upload_firmware: BLOCK1 uploaded (%zu bytes)", fw1->size);
	}

	/* USB led blinking green, ADSL led off */

	/* URB 11 */
	ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
			   buffer, 0x200, &actual_length, DATA_TIMEOUT);

	if (ret < 0) {
		dbg("speedtch_upload_firmware: read BLOCK2 from modem failed (%d)!", ret);
		goto fail_release;
	}
	dbg("speedtch_upload_firmware: BLOCK2 downloaded (%d bytes)", actual_length);

	/* URBs 12 to 139 - USB led blinking green, ADSL led off */
	for (offset = 0; offset < fw2->size; offset += PAGE_SIZE) {
		int thislen = min_t(int, PAGE_SIZE, fw2->size - offset);
		memcpy(buffer, fw2->data + offset, thislen);

		ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
				   buffer, thislen, &actual_length, DATA_TIMEOUT);

		if (ret < 0) {
			dbg("speedtch_upload_firmware: write BLOCK3 to modem failed (%d)!", ret);
			goto fail_release;
		}
	}
	dbg("speedtch_upload_firmware: BLOCK3 uploaded (%zu bytes)", fw2->size);

	/* USB led static green, ADSL led static red */

	/* URB 142 */
	ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
			   buffer, 0x200, &actual_length, DATA_TIMEOUT);

	if (ret < 0) {
		dbg("speedtch_upload_firmware: read BLOCK4 from modem failed (%d)!", ret);
		goto fail_release;
	}

	/* success */
	dbg("speedtch_upload_firmware: BLOCK4 downloaded (%d bytes)", actual_length);

	/* Delay to allow firmware to start up. We can do this here
	   because we're in our own kernel thread anyway. */
	msleep(1000);

	/* Enable software buffering, if requested */
	if (sw_buffering)
		speedtch_set_swbuff(instance, 1);

	/* Magic spell; don't ask us what this does */
	speedtch_test_sequence(instance);

	/* Start modem synchronisation */
	if (speedtch_start_synchro(instance))
		dbg("speedtch_start_synchro: failed");

	speedtch_got_firmware(instance, 1);

	free_page((unsigned long)buffer);
	return;

 fail_release:
	/* Only release interface #2 if uploading failed; we don't release it
	   we succeeded.  This prevents the userspace tools from trying to load
	   the firmware themselves */
	usb_driver_release_interface(&speedtch_usb_driver, intf);
 fail_free:
	free_page((unsigned long)buffer);
 fail:
	speedtch_got_firmware(instance, 0);
}

static int speedtch_find_firmware(struct speedtch_instance_data
				  *instance, int phase,
				  const struct firmware **fw_p)
{
	char buf[24];
	const u16 bcdDevice = le16_to_cpu(instance->u.usb_dev->descriptor.bcdDevice);
	const u8 major_revision = bcdDevice >> 8;
	const u8 minor_revision = bcdDevice & 0xff;

	sprintf(buf, "speedtch-%d.bin.%x.%02x", phase, major_revision, minor_revision);
	dbg("speedtch_find_firmware: looking for %s", buf);

	if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
		sprintf(buf, "speedtch-%d.bin.%x", phase, major_revision);
		dbg("speedtch_find_firmware: looking for %s", buf);

		if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
			sprintf(buf, "speedtch-%d.bin", phase);
			dbg("speedtch_find_firmware: looking for %s", buf);

			if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
				dev_warn(&instance->u.usb_dev->dev, "no stage %d firmware found!", phase);
				return -ENOENT;
			}
		}
	}

	dev_info(&instance->u.usb_dev->dev, "found stage %d firmware %s\n", phase, buf);

	return 0;
}

static int speedtch_load_firmware(void *arg)
{
	const struct firmware *fw1, *fw2;
	struct speedtch_instance_data *instance = arg;

	BUG_ON(!instance);

	daemonize("firmware/speedtch");

	if (!speedtch_find_firmware(instance, 1, &fw1)) {
		if (!speedtch_find_firmware(instance, 2, &fw2)) {
			speedtch_upload_firmware(instance, fw1, fw2);
			release_firmware(fw2);
		}
		release_firmware(fw1);
	}

	/* In case we failed, set state back to NO_FIRMWARE so that
	   another later attempt may work. Otherwise, we never actually
	   manage to recover if, for example, the firmware is on /usr and
	   we look for it too early. */
	speedtch_got_firmware(instance, 0);

	module_put(THIS_MODULE);
	udsl_put_instance(&instance->u);
	return 0;
}
#endif /* USE_FW_LOADER */

static void speedtch_firmware_start(struct speedtch_instance_data *instance)
{
#ifdef USE_FW_LOADER
	int ret;
#endif

	dbg("speedtch_firmware_start");

	down(&instance->u.serialize);	/* vs self, speedtch_got_firmware */

	if (instance->u.status >= UDSL_LOADING_FIRMWARE) {
		up(&instance->u.serialize);
		return;
	}

	instance->u.status = UDSL_LOADING_FIRMWARE;
	up(&instance->u.serialize);

#ifdef USE_FW_LOADER
	udsl_get_instance(&instance->u);
	try_module_get(THIS_MODULE);

	ret = kernel_thread(speedtch_load_firmware, instance,
			    CLONE_FS | CLONE_FILES);

	if (ret >= 0)
		return;		/* OK */

	dbg("speedtch_firmware_start: kernel_thread failed (%d)!", ret);

	module_put(THIS_MODULE);
	udsl_put_instance(&instance->u);
	/* Just pretend it never happened... hope modem_run happens */
#endif				/* USE_FW_LOADER */

	speedtch_got_firmware(instance, 0);
}

static int speedtch_firmware_wait(struct udsl_instance_data *instance)
{
	speedtch_firmware_start((void *)instance);

	if (wait_event_interruptible(instance->firmware_waiters, instance->status != UDSL_LOADING_FIRMWARE) < 0)
		return -ERESTARTSYS;

	return (instance->status == UDSL_LOADED_FIRMWARE) ? 0 : -EAGAIN;
}

/**********
**  USB  **
**********/

static int speedtch_usb_ioctl(struct usb_interface *intf, unsigned int code,
			      void *user_data)
{
	struct speedtch_instance_data *instance = usb_get_intfdata(intf);

	dbg("speedtch_usb_ioctl entered");

	if (!instance) {
		dbg("speedtch_usb_ioctl: NULL instance!");
		return -ENODEV;
	}

	switch (code) {
	case UDSL_IOCTL_LINE_UP:
		instance->u.atm_dev->signal = ATM_PHY_SIG_FOUND;
		speedtch_got_firmware(instance, 1);
		return (instance->u.status == UDSL_LOADED_FIRMWARE) ? 0 : -EIO;
	case UDSL_IOCTL_LINE_DOWN:
		instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
		return 0;
	default:
		return -ENOTTY;
	}
}

static int speedtch_usb_probe(struct usb_interface *intf,
			      const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	int ifnum = intf->altsetting->desc.bInterfaceNumber;
	struct speedtch_instance_data *instance;
	unsigned char mac_str[13];
	int ret, i;
	char buf7[SIZE_7];

	dbg("speedtch_usb_probe: trying device with vendor=0x%x, product=0x%x, ifnum %d",
	    le16_to_cpu(dev->descriptor.idVendor),
	    le16_to_cpu(dev->descriptor.idProduct), ifnum);

	if ((dev->descriptor.bDeviceClass != USB_CLASS_VENDOR_SPEC) || 
	    (ifnum != 1))
		return -ENODEV;

	dbg("speedtch_usb_probe: device accepted");

	/* instance init */
	instance = kmalloc(sizeof(*instance), GFP_KERNEL);
	if (!instance) {
		dbg("speedtch_usb_probe: no memory for instance data!");
		return -ENOMEM;
	}

	memset(instance, 0, sizeof(struct speedtch_instance_data));

	if ((ret = usb_set_interface(dev, 0, 0)) < 0)
		goto fail;

	if ((ret = usb_set_interface(dev, 2, 0)) < 0)
		goto fail;

	instance->u.data_endpoint = SPEEDTCH_ENDPOINT_DATA;
	instance->u.firmware_wait = speedtch_firmware_wait;
	instance->u.driver_name = speedtch_driver_name;

	ret = udsl_instance_setup(dev, &instance->u);
	if (ret)
		goto fail;

	init_timer(&instance->poll_timer);
	instance->poll_timer.function = speedtch_timer_poll;
	instance->poll_timer.data = (unsigned long)instance;

	INIT_WORK(&instance->poll_work, (void *)speedtch_poll_status, instance);

	/* set MAC address, it is stored in the serial number */
	memset(instance->u.atm_dev->esi, 0, sizeof(instance->u.atm_dev->esi));
	if (usb_string(dev, dev->descriptor.iSerialNumber, mac_str, sizeof(mac_str)) == 12) {
		for (i = 0; i < 6; i++)
			instance->u.atm_dev->esi[i] =
				(hex2int(mac_str[i * 2]) * 16) + (hex2int(mac_str[i * 2 + 1]));
	}

	/* First check whether the modem already seems to be alive */
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      0x12, 0xc0, 0x07, 0x00, buf7, SIZE_7, 500);

	if (ret == SIZE_7) {
		dbg("firmware appears to be already loaded");
		speedtch_got_firmware(instance, 1);
		speedtch_poll_status(instance);
	} else {
		speedtch_firmware_start(instance);
	}

	usb_set_intfdata(intf, instance);

	return 0;

 fail:
	kfree(instance);

	return -ENOMEM;
}

static void speedtch_usb_disconnect(struct usb_interface *intf)
{
	struct speedtch_instance_data *instance = usb_get_intfdata(intf);

	dbg("speedtch_usb_disconnect entered");

	if (!instance) {
		dbg("speedtch_usb_disconnect: NULL instance!");
		return;
	}

/*QQ need to handle disconnects on interface #2 while uploading firmware */
/*QQ and what about interface #1? */

	if (instance->int_urb) {
		struct urb *int_urb = instance->int_urb;
		instance->int_urb = NULL;
		wmb();
		usb_unlink_urb(int_urb);
		usb_free_urb(int_urb);
	}

	instance->int_data[0] = 1;
	del_timer_sync(&instance->poll_timer);
	wmb();
	flush_scheduled_work();

	udsl_instance_disconnect(&instance->u);

	/* clean up */
	usb_set_intfdata(intf, NULL);
	udsl_put_instance(&instance->u);
}

/***********
**  init  **
***********/

static int __init speedtch_usb_init(void)
{
	dbg("speedtch_usb_init: driver version " DRIVER_VERSION);

	return usb_register(&speedtch_usb_driver);
}

static void __exit speedtch_usb_cleanup(void)
{
	dbg("speedtch_usb_cleanup entered");

	usb_deregister(&speedtch_usb_driver);
}

module_init(speedtch_usb_init);
module_exit(speedtch_usb_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);