aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/image/microtek.c
blob: 28538db9eaf3920eb5e565058882c069ecf6ddde (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
/* Driver for Microtek Scanmaker X6 USB scanner, and possibly others.
 *
 * (C) Copyright 2000 John Fremlin <vii@penguinpowered.com>
 * (C) Copyright 2000 Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
 *
 * Parts shamelessly stolen from usb-storage and copyright by their
 * authors. Thanks to Matt Dharm for giving us permission!
 *
 * This driver implements a SCSI host controller driver and a USB
 * device driver. To avoid confusion, all the USB related stuff is
 * prefixed by mts_usb_ and all the SCSI stuff by mts_scsi_.
 *
 * Microtek (www.microtek.com) did not release the specifications for
 * their USB protocol to us, so we had to reverse engineer them. We
 * don't know for which models they are valid.
 *
 * The X6 USB has three bulk endpoints, one output (0x1) down which
 * commands and outgoing data are sent, and two input: 0x82 from which
 * normal data is read from the scanner (in packets of maximum 32
 * bytes) and from which the status byte is read, and 0x83 from which
 * the results of a scan (or preview) are read in up to 64 * 1024 byte
 * chunks by the Windows driver. We don't know how much it is possible
 * to read at a time from 0x83.
 *
 * It seems possible to read (with URB transfers) everything from 0x82
 * in one go, without bothering to read in 32 byte chunks.
 *
 * There seems to be an optimisation of a further READ implicit if
 * you simply read from 0x83.
 *
 * Guessed protocol:
 *
 *	Send raw SCSI command to EP 0x1
 *
 *	If there is data to receive:
 *		If the command was READ datatype=image:
 *			Read a lot of data from EP 0x83
 *		Else:
 *			Read data from EP 0x82
 *	Else:
 *		If there is data to transmit:
 *			Write it to EP 0x1
 *
 *	Read status byte from EP 0x82
 *
 * References:
 *
 * The SCSI command set for the scanner is available from
 *	ftp://ftp.microtek.com/microtek/devpack/
 *
 * Microtek NV sent us a more up to date version of the document. If
 * you want it, just send mail.
 *
 * Status:
 *
 *	Untested with multiple scanners.
 *	Untested on SMP.
 *	Untested on a bigendian machine.
 *
 * History:
 *
 *	20000417 starting history
 *	20000417 fixed load oops
 *	20000417 fixed unload oops
 *	20000419 fixed READ IMAGE detection
 *	20000424 started conversion to use URBs
 *	20000502 handled short transfers as errors
 *	20000513 rename and organisation of functions (john)
 *	20000513 added IDs for all products supported by Windows driver (john)
 *	20000514 Rewrote mts_scsi_queuecommand to use URBs (john)
 *	20000514 Version 0.0.8j
 *      20000514 Fix reporting of non-existant devices to SCSI layer (john)
 *	20000514 Added MTS_DEBUG_INT (john)
 *	20000514 Changed "usb-microtek" to "microtek" for consistency (john)
 *	20000514 Stupid bug fixes (john)
 *	20000514 Version 0.0.9j
 *	20000515 Put transfer context and URB in mts_desc (john)
 *	20000515 Added prelim turn off debugging support (john)
 *	20000515 Version 0.0.10j
 *      20000515 Fixed up URB allocation (clear URB on alloc) (john)
 *      20000515 Version 0.0.11j
 *	20000516 Removed unnecessary spinlock in mts_transfer_context (john)
 *	20000516 Removed unnecessary up on instance lock in mts_remove_nolock (john)
 *	20000516 Implemented (badly) scsi_abort (john)
 *	20000516 Version 0.0.12j
 *      20000517 Hopefully removed mts_remove_nolock quasideadlock (john)
 *      20000517 Added mts_debug_dump to print ll USB info (john)
 *	20000518 Tweaks and documentation updates (john)
 *	20000518 Version 0.0.13j
 *	20000518 Cleaned up abort handling (john)
 *	20000523 Removed scsi_command and various scsi_..._resets (john)
 *	20000523 Added unlink URB on scsi_abort, now OHCI supports it (john)
 *	20000523 Fixed last tiresome compile warning (john)
 *	20000523 Version 0.0.14j (though version 0.1 has come out?)
 *	20000602 Added primitive reset
 *	20000602 Version 0.2.0
 *	20000603 various cosmetic changes
 *	20000603 Version 0.2.1
 *	20000620 minor cosmetic changes
 *	20000620 Version 0.2.2
 *	20000822 Hopefully fixed deadlock in mts_remove_nolock()
 *	20000822 Fixed minor race in mts_transfer_cleanup()
 *	20000822 Fixed deadlock on submission error in queuecommand
 *	20000822 Version 0.2.3
 *	20000913 Reduced module size if debugging is off
 *	20000913 Version 0.2.4
 *      20010210 New abort logic
 *      20010210 Version 0.3.0
 *	20010217 Merged scatter/gather
 *	20010218 Version 0.4.0
 *	20010218 Cosmetic fixes
 *	20010218 Version 0.4.1
 *      20010306 Abort while using scatter/gather
 *      20010306 Version 0.4.2
 *      20010311 Remove all timeouts and tidy up generally (john)
 *	20010320 check return value of scsi_register()
 *	20010320 Version 0.4.3
 *	20010408 Identify version on module load.
 *	20011003 Fix multiple requests
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/usb.h>
#include <linux/proc_fs.h>

#include <asm/atomic.h>
#include <linux/blkdev.h>
#include "../../scsi/scsi.h"
#include <scsi/scsi_host.h>

#include "microtek.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.4.3"
#define DRIVER_AUTHOR "John Fremlin <vii@penguinpowered.com>, Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>"
#define DRIVER_DESC "Microtek Scanmaker X6 USB scanner driver"

/* Should we do debugging? */

//#define MTS_DO_DEBUG

/* USB layer driver interface */

static int mts_usb_probe(struct usb_interface *intf,
			 const struct usb_device_id *id);
static void mts_usb_disconnect(struct usb_interface *intf);

static struct usb_device_id mts_usb_ids [];

static struct usb_driver mts_usb_driver = {
	.name =		"microtekX6",
	.probe =	mts_usb_probe,
	.disconnect =	mts_usb_disconnect,
	.id_table =	mts_usb_ids,
};


/* Internal driver stuff */

#define MTS_VERSION	"0.4.3"
#define MTS_NAME	"microtek usb (rev " MTS_VERSION "): "

#define MTS_WARNING(x...) \
	printk( KERN_WARNING MTS_NAME x )
#define MTS_ERROR(x...) \
	printk( KERN_ERR MTS_NAME x )
#define MTS_INT_ERROR(x...) \
	MTS_ERROR(x)
#define MTS_MESSAGE(x...) \
	printk( KERN_INFO MTS_NAME x )

#if defined MTS_DO_DEBUG

#define MTS_DEBUG(x...) \
	printk( KERN_DEBUG MTS_NAME x )

#define MTS_DEBUG_GOT_HERE() \
	MTS_DEBUG("got to %s:%d (%s)\n", __FILE__, (int)__LINE__, __PRETTY_FUNCTION__ )
#define MTS_DEBUG_INT() \
	do { MTS_DEBUG_GOT_HERE(); \
	     MTS_DEBUG("transfer = 0x%x context = 0x%x\n",(int)transfer,(int)context ); \
	     MTS_DEBUG("status = 0x%x data-length = 0x%x sent = 0x%x\n",(int)transfer->status,(int)context->data_length, (int)transfer->actual_length ); \
             mts_debug_dump(context->instance);\
	   } while(0)
#else

#define MTS_NUL_STATEMENT do { } while(0)

#define MTS_DEBUG(x...)	MTS_NUL_STATEMENT
#define MTS_DEBUG_GOT_HERE() MTS_NUL_STATEMENT
#define MTS_DEBUG_INT() MTS_NUL_STATEMENT

#endif



#define MTS_INT_INIT()\
	struct mts_transfer_context* context = (struct mts_transfer_context*)transfer->context; \
	MTS_DEBUG_INT();\

#ifdef MTS_DO_DEBUG

static inline void mts_debug_dump(struct mts_desc* desc) {
	MTS_DEBUG("desc at 0x%x: toggle = %02x%02x\n",
		  (int)desc,
		  (int)desc->usb_dev->toggle[1],(int)desc->usb_dev->toggle[0]
		);
	MTS_DEBUG("ep_out=%x ep_response=%x ep_image=%x\n",
		  usb_sndbulkpipe(desc->usb_dev,desc->ep_out),
		  usb_rcvbulkpipe(desc->usb_dev,desc->ep_response),
		  usb_rcvbulkpipe(desc->usb_dev,desc->ep_image)
		);
}


static inline void mts_show_command(Scsi_Cmnd *srb)
{
	char *what = NULL;

	switch (srb->cmnd[0]) {
	case TEST_UNIT_READY: what = "TEST_UNIT_READY"; break;
	case REZERO_UNIT: what = "REZERO_UNIT"; break;
	case REQUEST_SENSE: what = "REQUEST_SENSE"; break;
	case FORMAT_UNIT: what = "FORMAT_UNIT"; break;
	case READ_BLOCK_LIMITS: what = "READ_BLOCK_LIMITS"; break;
	case REASSIGN_BLOCKS: what = "REASSIGN_BLOCKS"; break;
	case READ_6: what = "READ_6"; break;
	case WRITE_6: what = "WRITE_6"; break;
	case SEEK_6: what = "SEEK_6"; break;
	case READ_REVERSE: what = "READ_REVERSE"; break;
	case WRITE_FILEMARKS: what = "WRITE_FILEMARKS"; break;
	case SPACE: what = "SPACE"; break;
	case INQUIRY: what = "INQUIRY"; break;
	case RECOVER_BUFFERED_DATA: what = "RECOVER_BUFFERED_DATA"; break;
	case MODE_SELECT: what = "MODE_SELECT"; break;
	case RESERVE: what = "RESERVE"; break;
	case RELEASE: what = "RELEASE"; break;
	case COPY: what = "COPY"; break;
	case ERASE: what = "ERASE"; break;
	case MODE_SENSE: what = "MODE_SENSE"; break;
	case START_STOP: what = "START_STOP"; break;
	case RECEIVE_DIAGNOSTIC: what = "RECEIVE_DIAGNOSTIC"; break;
	case SEND_DIAGNOSTIC: what = "SEND_DIAGNOSTIC"; break;
	case ALLOW_MEDIUM_REMOVAL: what = "ALLOW_MEDIUM_REMOVAL"; break;
	case SET_WINDOW: what = "SET_WINDOW"; break;
	case READ_CAPACITY: what = "READ_CAPACITY"; break;
	case READ_10: what = "READ_10"; break;
	case WRITE_10: what = "WRITE_10"; break;
	case SEEK_10: what = "SEEK_10"; break;
	case WRITE_VERIFY: what = "WRITE_VERIFY"; break;
	case VERIFY: what = "VERIFY"; break;
	case SEARCH_HIGH: what = "SEARCH_HIGH"; break;
	case SEARCH_EQUAL: what = "SEARCH_EQUAL"; break;
	case SEARCH_LOW: what = "SEARCH_LOW"; break;
	case SET_LIMITS: what = "SET_LIMITS"; break;
	case READ_POSITION: what = "READ_POSITION"; break;
	case SYNCHRONIZE_CACHE: what = "SYNCHRONIZE_CACHE"; break;
	case LOCK_UNLOCK_CACHE: what = "LOCK_UNLOCK_CACHE"; break;
	case READ_DEFECT_DATA: what = "READ_DEFECT_DATA"; break;
	case MEDIUM_SCAN: what = "MEDIUM_SCAN"; break;
	case COMPARE: what = "COMPARE"; break;
	case COPY_VERIFY: what = "COPY_VERIFY"; break;
	case WRITE_BUFFER: what = "WRITE_BUFFER"; break;
	case READ_BUFFER: what = "READ_BUFFER"; break;
	case UPDATE_BLOCK: what = "UPDATE_BLOCK"; break;
	case READ_LONG: what = "READ_LONG"; break;
	case WRITE_LONG: what = "WRITE_LONG"; break;
	case CHANGE_DEFINITION: what = "CHANGE_DEFINITION"; break;
	case WRITE_SAME: what = "WRITE_SAME"; break;
	case READ_TOC: what = "READ_TOC"; break;
	case LOG_SELECT: what = "LOG_SELECT"; break;
	case LOG_SENSE: what = "LOG_SENSE"; break;
	case MODE_SELECT_10: what = "MODE_SELECT_10"; break;
	case MODE_SENSE_10: what = "MODE_SENSE_10"; break;
	case MOVE_MEDIUM: what = "MOVE_MEDIUM"; break;
	case READ_12: what = "READ_12"; break;
	case WRITE_12: what = "WRITE_12"; break;
	case WRITE_VERIFY_12: what = "WRITE_VERIFY_12"; break;
	case SEARCH_HIGH_12: what = "SEARCH_HIGH_12"; break;
	case SEARCH_EQUAL_12: what = "SEARCH_EQUAL_12"; break;
	case SEARCH_LOW_12: what = "SEARCH_LOW_12"; break;
	case READ_ELEMENT_STATUS: what = "READ_ELEMENT_STATUS"; break;
	case SEND_VOLUME_TAG: what = "SEND_VOLUME_TAG"; break;
	case WRITE_LONG_2: what = "WRITE_LONG_2"; break;
	default:
		MTS_DEBUG("can't decode command\n");
		goto out;
		break;
	}
	MTS_DEBUG( "Command %s (%d bytes)\n", what, srb->cmd_len);

 out:
	MTS_DEBUG( "  %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
	       srb->cmnd[0], srb->cmnd[1], srb->cmnd[2], srb->cmnd[3], srb->cmnd[4], srb->cmnd[5],
	       srb->cmnd[6], srb->cmnd[7], srb->cmnd[8], srb->cmnd[9]);
}

#else

static inline void mts_show_command(Scsi_Cmnd * dummy)
{
}

static inline void mts_debug_dump(struct mts_desc* dummy)
{
}

#endif

static inline void mts_urb_abort(struct mts_desc* desc) {
	MTS_DEBUG_GOT_HERE();
	mts_debug_dump(desc);

	usb_kill_urb( desc->urb );
}

static int mts_slave_alloc (struct scsi_device *s)
{
	s->inquiry_len = 0x24;
	return 0;
}

static int mts_slave_configure (struct scsi_device *s)
{
	blk_queue_dma_alignment(s->request_queue, (512 - 1));
	return 0;
}

static int mts_scsi_abort (Scsi_Cmnd *srb)
{
	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);

	MTS_DEBUG_GOT_HERE();

	mts_urb_abort(desc);

	return FAILED;
}

static int mts_scsi_host_reset (Scsi_Cmnd *srb)
{
	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
	int result, rc;

	MTS_DEBUG_GOT_HERE();
	mts_debug_dump(desc);

	rc = usb_lock_device_for_reset(desc->usb_dev, desc->usb_intf);
	if (rc < 0)
		return FAILED;
	result = usb_reset_device(desc->usb_dev);;
	if (rc)
		usb_unlock_device(desc->usb_dev);
	return result ? FAILED : SUCCESS;
}

static
int mts_scsi_queuecommand (Scsi_Cmnd *srb, mts_scsi_cmnd_callback callback );

static void mts_transfer_cleanup( struct urb *transfer );
static void mts_do_sg(struct urb * transfer, struct pt_regs *regs);

static inline
void mts_int_submit_urb (struct urb* transfer,
			int pipe,
			void* data,
			unsigned length,
			usb_complete_t callback )
/* Interrupt context! */

/* Holding transfer->context->lock! */
{
	int res;

	MTS_INT_INIT();

	usb_fill_bulk_urb(transfer,
		      context->instance->usb_dev,
		      pipe,
		      data,
		      length,
		      callback,
		      context
		);

	transfer->status = 0;

	res = usb_submit_urb( transfer, GFP_ATOMIC );
	if ( unlikely(res) ) {
		MTS_INT_ERROR( "could not submit URB! Error was %d\n",(int)res );
		context->srb->result = DID_ERROR << 16;
		mts_transfer_cleanup(transfer);
	}
	return;
}


static void mts_transfer_cleanup( struct urb *transfer )
/* Interrupt context! */
{
	MTS_INT_INIT();

	if ( likely(context->final_callback != NULL) )
		context->final_callback(context->srb);

}

static void mts_transfer_done( struct urb *transfer, struct pt_regs *regs )
{
	MTS_INT_INIT();

	context->srb->result &= MTS_SCSI_ERR_MASK;
	context->srb->result |= (unsigned)(*context->scsi_status)<<1;

	mts_transfer_cleanup(transfer);

	return;
}


static void mts_get_status( struct urb *transfer )
/* Interrupt context! */
{
	MTS_INT_INIT();

	mts_int_submit_urb(transfer,
			   usb_rcvbulkpipe(context->instance->usb_dev,
					   context->instance->ep_response),
			   context->scsi_status,
			   1,
			   mts_transfer_done );
}

static void mts_data_done( struct urb* transfer, struct pt_regs *regs )
/* Interrupt context! */
{
	MTS_INT_INIT();

	if ( context->data_length != transfer->actual_length ) {
		context->srb->resid = context->data_length - transfer->actual_length;
	} else if ( unlikely(transfer->status) ) {
		context->srb->result = (transfer->status == -ENOENT ? DID_ABORT : DID_ERROR)<<16;
	}

	mts_get_status(transfer);

	return;
}


static void mts_command_done( struct urb *transfer, struct pt_regs *regs )
/* Interrupt context! */
{
	MTS_INT_INIT();

	if ( unlikely(transfer->status) ) {
	        if (transfer->status == -ENOENT) {
		        /* We are being killed */
			MTS_DEBUG_GOT_HERE();
			context->srb->result = DID_ABORT<<16;
                } else {
		        /* A genuine error has occurred */
			MTS_DEBUG_GOT_HERE();

		        context->srb->result = DID_ERROR<<16;
                }
		mts_transfer_cleanup(transfer);

		return;
	}

	if (context->srb->cmnd[0] == REQUEST_SENSE) {
		mts_int_submit_urb(transfer,
				   context->data_pipe,
				   context->srb->sense_buffer,
				   context->data_length,
				   mts_data_done);
	} else { if ( context->data ) {
			mts_int_submit_urb(transfer,
					   context->data_pipe,
					   context->data,
					   context->data_length,
					   context->srb->use_sg > 1 ? mts_do_sg : mts_data_done);
		} else {
			mts_get_status(transfer);
		}
	}

	return;
}

static void mts_do_sg (struct urb* transfer, struct pt_regs *regs)
{
	struct scatterlist * sg;
	MTS_INT_INIT();

	MTS_DEBUG("Processing fragment %d of %d\n", context->fragment,context->srb->use_sg);

	if (unlikely(transfer->status)) {
                context->srb->result = (transfer->status == -ENOENT ? DID_ABORT : DID_ERROR)<<16;
		mts_transfer_cleanup(transfer);
        }

	sg = context->srb->buffer;
	context->fragment++;
	mts_int_submit_urb(transfer,
			   context->data_pipe,
			   page_address(sg[context->fragment].page) +
			   sg[context->fragment].offset,
			   sg[context->fragment].length,
			   context->fragment + 1 == context->srb->use_sg ? mts_data_done : mts_do_sg);
	return;
}

static const u8 mts_read_image_sig[] = { 0x28, 00, 00, 00 };
static const u8 mts_read_image_sig_len = 4;
static const unsigned char mts_direction[256/8] = {
	0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
	0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


#define MTS_DIRECTION_IS_IN(x) ((mts_direction[x>>3] >> (x & 7)) & 1)

static void
mts_build_transfer_context( Scsi_Cmnd *srb, struct mts_desc* desc )
{
	int pipe;
	struct scatterlist * sg;
	
	MTS_DEBUG_GOT_HERE();

	desc->context.instance = desc;
	desc->context.srb = srb;
	desc->context.fragment = 0;

	if (!srb->use_sg) {
		if ( !srb->bufflen ){
			desc->context.data = NULL;
			desc->context.data_length = 0;
			return;
		} else {
			desc->context.data = srb->buffer;
			desc->context.data_length = srb->bufflen;
			MTS_DEBUG("length = %d or %d\n",
				  srb->request_bufflen, srb->bufflen);
		}
	} else {
		MTS_DEBUG("Using scatter/gather\n");
		sg = srb->buffer;
		desc->context.data = page_address(sg[0].page) + sg[0].offset;
		desc->context.data_length = sg[0].length;
	}


	/* can't rely on srb->sc_data_direction */

	/* Brutally ripped from usb-storage */

	if ( !memcmp( srb->cmnd, mts_read_image_sig, mts_read_image_sig_len )
) { 		pipe = usb_rcvbulkpipe(desc->usb_dev,desc->ep_image);
		MTS_DEBUG( "transfering from desc->ep_image == %d\n",
			   (int)desc->ep_image );
	} else if ( MTS_DIRECTION_IS_IN(srb->cmnd[0]) ) {
			pipe = usb_rcvbulkpipe(desc->usb_dev,desc->ep_response);
			MTS_DEBUG( "transfering from desc->ep_response == %d\n",
				   (int)desc->ep_response);
	} else {
		MTS_DEBUG("transfering to desc->ep_out == %d\n",
			  (int)desc->ep_out);
		pipe = usb_sndbulkpipe(desc->usb_dev,desc->ep_out);
	}
	desc->context.data_pipe = pipe;
}


static
int mts_scsi_queuecommand( Scsi_Cmnd *srb, mts_scsi_cmnd_callback callback )
{
	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
	int err = 0;
	int res;

	MTS_DEBUG_GOT_HERE();
	mts_show_command(srb);
	mts_debug_dump(desc);

	if ( srb->device->lun || srb->device->id || srb->device->channel ) {

		MTS_DEBUG("Command to LUN=%d ID=%d CHANNEL=%d from SCSI layer\n",(int)srb->device->lun,(int)srb->device->id, (int)srb->device->channel );

		MTS_DEBUG("this device doesn't exist\n");

		srb->result = DID_BAD_TARGET << 16;

		if(likely(callback != NULL))
			callback(srb);

		goto out;
	}

	
	usb_fill_bulk_urb(desc->urb,
		      desc->usb_dev,
		      usb_sndbulkpipe(desc->usb_dev,desc->ep_out),
		      srb->cmnd,
		      srb->cmd_len,
		      mts_command_done,
		      &desc->context
		      );


	mts_build_transfer_context( srb, desc );
	desc->context.final_callback = callback;
	
	/* here we need ATOMIC as we are called with the iolock */
	res=usb_submit_urb(desc->urb, GFP_ATOMIC);

	if(unlikely(res)){
		MTS_ERROR("error %d submitting URB\n",(int)res);
		srb->result = DID_ERROR << 16;

		if(likely(callback != NULL))
			callback(srb);

	}
out:
	return err;
}

static struct scsi_host_template mts_scsi_host_template = {
	.module			= THIS_MODULE,
	.name			= "microtekX6",
	.proc_name		= "microtekX6",
	.queuecommand		= mts_scsi_queuecommand,
	.eh_abort_handler	= mts_scsi_abort,
	.eh_host_reset_handler	= mts_scsi_host_reset,
	.sg_tablesize =		SG_ALL,
	.can_queue =		1,
	.this_id =		-1,
	.cmd_per_lun =		1,
	.use_clustering =	1,
	.emulated =		1,
	.slave_alloc =		mts_slave_alloc,
	.slave_configure =	mts_slave_configure,
	.max_sectors=		256, /* 128 K */
};

struct vendor_product
{
	char* name;
	enum
	{
		mts_sup_unknown=0,
		mts_sup_alpha,
		mts_sup_full
	}
	support_status;
} ;


/* These are taken from the msmUSB.inf file on the Windows driver CD */
static const struct vendor_product mts_supported_products[] =
{
	{ "Phantom 336CX",	mts_sup_unknown},
	{ "Phantom 336CX",	mts_sup_unknown},
	{ "Scanmaker X6",	mts_sup_alpha},
	{ "Phantom C6",		mts_sup_unknown},
	{ "Phantom 336CX",	mts_sup_unknown},
	{ "ScanMaker V6USL",	mts_sup_unknown},
	{ "ScanMaker V6USL",	mts_sup_unknown},
	{ "Scanmaker V6UL",	mts_sup_unknown},
	{ "Scanmaker V6UPL",	mts_sup_alpha},
};

/* The entries of microtek_table must correspond, line-by-line to
   the entries of mts_supported_products[]. */

static struct usb_device_id mts_usb_ids [] =
{
	{ USB_DEVICE(0x4ce, 0x0300) },
	{ USB_DEVICE(0x5da, 0x0094) },
	{ USB_DEVICE(0x5da, 0x0099) },
	{ USB_DEVICE(0x5da, 0x009a) },
	{ USB_DEVICE(0x5da, 0x00a0) },
	{ USB_DEVICE(0x5da, 0x00a3) },
	{ USB_DEVICE(0x5da, 0x80a3) },
	{ USB_DEVICE(0x5da, 0x80ac) },
	{ USB_DEVICE(0x5da, 0x00b6) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, mts_usb_ids);


static int mts_usb_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	int i;
	int ep_out = -1;
	int ep_in_set[3]; /* this will break if we have more than three endpoints
			   which is why we check */
	int *ep_in_current = ep_in_set;
	int err_retval = -ENOMEM;

	struct mts_desc * new_desc;
	struct vendor_product const* p;
	struct usb_device *dev = interface_to_usbdev (intf);

	/* the current altsetting on the interface we're probing */
	struct usb_host_interface *altsetting;

	MTS_DEBUG_GOT_HERE();
	MTS_DEBUG( "usb-device descriptor at %x\n", (int)dev );

	MTS_DEBUG( "product id = 0x%x, vendor id = 0x%x\n",
		   le16_to_cpu(dev->descriptor.idProduct),
		   le16_to_cpu(dev->descriptor.idVendor) );

	MTS_DEBUG_GOT_HERE();

	p = &mts_supported_products[id - mts_usb_ids];

	MTS_DEBUG_GOT_HERE();

	MTS_DEBUG( "found model %s\n", p->name );
	if ( p->support_status != mts_sup_full )
		MTS_MESSAGE( "model %s is not known to be fully supported, reports welcome!\n",
			     p->name );

	/* the current altsetting on the interface we're probing */
	altsetting = intf->cur_altsetting;


	/* Check if the config is sane */

	if ( altsetting->desc.bNumEndpoints != MTS_EP_TOTAL ) {
		MTS_WARNING( "expecting %d got %d endpoints! Bailing out.\n",
			     (int)MTS_EP_TOTAL, (int)altsetting->desc.bNumEndpoints );
		return -ENODEV;
	}

	for( i = 0; i < altsetting->desc.bNumEndpoints; i++ ) {
		if ((altsetting->endpoint[i].desc.bmAttributes &
		     USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK) {

			MTS_WARNING( "can only deal with bulk endpoints; endpoint %d is not bulk.\n",
			     (int)altsetting->endpoint[i].desc.bEndpointAddress );
		} else {
			if (altsetting->endpoint[i].desc.bEndpointAddress &
			    USB_DIR_IN)
				*ep_in_current++
					= altsetting->endpoint[i].desc.bEndpointAddress &
					USB_ENDPOINT_NUMBER_MASK;
			else {
				if ( ep_out != -1 ) {
					MTS_WARNING( "can only deal with one output endpoints. Bailing out." );
					return -ENODEV;
				}

				ep_out = altsetting->endpoint[i].desc.bEndpointAddress &
					USB_ENDPOINT_NUMBER_MASK;
			}
		}

	}


	if ( ep_out == -1 ) {
		MTS_WARNING( "couldn't find an output bulk endpoint. Bailing out.\n" );
		return -ENODEV;
	}


	new_desc = kzalloc(sizeof(struct mts_desc), GFP_KERNEL);
	if (!new_desc)
		goto out;

	new_desc->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!new_desc->urb)
		goto out_kfree;

	new_desc->context.scsi_status = kmalloc(1, GFP_KERNEL);
	if (!new_desc->context.scsi_status)
		goto out_kfree2;

	new_desc->usb_dev = dev;
	new_desc->usb_intf = intf;
	init_MUTEX(&new_desc->lock);

	/* endpoints */
	new_desc->ep_out = ep_out;
	new_desc->ep_response = ep_in_set[0];
	new_desc->ep_image = ep_in_set[1];

	if ( new_desc->ep_out != MTS_EP_OUT )
		MTS_WARNING( "will this work? Command EP is not usually %d\n",
			     (int)new_desc->ep_out );

	if ( new_desc->ep_response != MTS_EP_RESPONSE )
		MTS_WARNING( "will this work? Response EP is not usually %d\n",
			     (int)new_desc->ep_response );

	if ( new_desc->ep_image != MTS_EP_IMAGE )
		MTS_WARNING( "will this work? Image data EP is not usually %d\n",
			     (int)new_desc->ep_image );

	new_desc->host = scsi_host_alloc(&mts_scsi_host_template,
			sizeof(new_desc));
	if (!new_desc->host)
		goto out_free_urb;

	new_desc->host->hostdata[0] = (unsigned long)new_desc;
	if (scsi_add_host(new_desc->host, NULL)) {
		err_retval = -EIO;
		goto out_free_urb;
	}
	scsi_scan_host(new_desc->host);

	usb_set_intfdata(intf, new_desc);
	return 0;

 out_kfree2:
	kfree(new_desc->context.scsi_status);
 out_free_urb:
	usb_free_urb(new_desc->urb);
 out_kfree:
	kfree(new_desc);
 out:
	return err_retval;
}

static void mts_usb_disconnect (struct usb_interface *intf)
{
	struct mts_desc *desc = usb_get_intfdata(intf);

	usb_set_intfdata(intf, NULL);

	usb_kill_urb(desc->urb);
	scsi_remove_host(desc->host);

	scsi_host_put(desc->host);
	usb_free_urb(desc->urb);
	kfree(desc->context.scsi_status);
	kfree(desc);
}


static int __init microtek_drv_init(void)
{
	return usb_register(&mts_usb_driver);
}

static void __exit microtek_drv_exit(void)
{
	usb_deregister(&mts_usb_driver);
}

module_init(microtek_drv_init);
module_exit(microtek_drv_exit);

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