summaryrefslogtreecommitdiffstats
path: root/dediprog.c
blob: 9559eed41002c51ea83da73d34a50c4396138995 (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
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2010 Carl-Daniel Hailfinger
 *
 * 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; version 2 of the License.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdio.h>
#include <string.h>
#include <usb.h>
#include "flash.h"
#include "chipdrivers.h"
#include "programmer.h"
#include "spi.h"

#define FIRMWARE_VERSION(x,y,z) ((x << 16) | (y << 8) | z)
#define DEFAULT_TIMEOUT 3000
static usb_dev_handle *dediprog_handle;
static int dediprog_firmwareversion;
static int dediprog_endpoint;

#define DEDI_SPI_CMD_PAGEWRITE	0x1
#define DEDI_SPI_CMD_AAIWRITE	0x4

#if 0
/* Might be useful for other pieces of code as well. */
static void print_hex(void *buf, size_t len)
{
	size_t i;

	for (i = 0; i < len; i++)
		msg_pdbg(" %02x", ((uint8_t *)buf)[i]);
}
#endif

/* Might be useful for other USB devices as well. static for now. */
static struct usb_device *get_device_by_vid_pid(uint16_t vid, uint16_t pid)
{
	struct usb_bus *bus;
	struct usb_device *dev;

	for (bus = usb_get_busses(); bus; bus = bus->next)
		for (dev = bus->devices; dev; dev = dev->next)
			if ((dev->descriptor.idVendor == vid) &&
			    (dev->descriptor.idProduct == pid))
				return dev;

	return NULL;
}

//int usb_control_msg(usb_dev_handle *dev, int requesttype, int request, int value, int index, char *bytes, int size, int timeout);

/* Set/clear LEDs on dediprog */
#define PASS_ON		(0 << 0)
#define PASS_OFF	(1 << 0)
#define BUSY_ON		(0 << 1)
#define BUSY_OFF	(1 << 1)
#define ERROR_ON	(0 << 2)
#define ERROR_OFF	(1 << 2)
static int current_led_status = -1;

static int dediprog_set_leds(int leds)
{
	int ret, target_leds;

	if (leds < 0 || leds > 7)
		leds = 0; // Bogus value, enable all LEDs

	if (leds == current_led_status)
		return 0;

	/* Older Dediprogs with 2.x.x and 3.x.x firmware only had
	 * two LEDs, and they were reversed. So map them around if 
	 * we have an old device. On those devices the LEDs map as
	 * follows:
	 *   bit 2 == 0: green light is on.
	 *   bit 0 == 0: red light is on. 
	 */
	if (dediprog_firmwareversion < FIRMWARE_VERSION(5,0,0)) {
		target_leds = ((leds & ERROR_OFF) >> 2) | 
			((leds & PASS_OFF) << 2);
	} else {
		target_leds = leds;
	}

	ret = usb_control_msg(dediprog_handle, 0x42, 0x07, 0x09, target_leds,
			      NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command Set LED 0x%x failed (%s)!\n",
			 leds, usb_strerror());
		return 1;
	}

	current_led_status = leds;

	return 0;
}

static int dediprog_set_spi_voltage(int millivolt)
{
	int ret;
	uint16_t voltage_selector;

	switch (millivolt) {
	case 0:
		/* Admittedly this one is an assumption. */
		voltage_selector = 0x0;
		break;
	case 1800:
		voltage_selector = 0x12;
		break;
	case 2500:
		voltage_selector = 0x11;
		break;
	case 3500:
		voltage_selector = 0x10;
		break;
	default:
		msg_perr("Unknown voltage %i mV! Aborting.\n", millivolt);
		return 1;
	}
	msg_pdbg("Setting SPI voltage to %u.%03u V\n", millivolt / 1000,
		 millivolt % 1000);

	if (voltage_selector == 0) {
		/* Wait some time as the original driver does. */
		programmer_delay(200 * 1000);
	}
	ret = usb_control_msg(dediprog_handle, 0x42, 0x9, voltage_selector,
			      0xff, NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command Set SPI Voltage 0x%x failed!\n",
			 voltage_selector);
		return 1;
	}
	if (voltage_selector != 0) {
		/* Wait some time as the original driver does. */
		programmer_delay(200 * 1000);
	}
	return 0;
}

#if 0
/* After dediprog_set_spi_speed, the original app always calls
 * dediprog_set_spi_voltage(0) and then
 * dediprog_check_devicestring() four times in a row.
 * After that, dediprog_command_a() is called.
 * This looks suspiciously like the microprocessor in the SF100 has to be
 * restarted/reinitialized in case the speed changes.
 */
static int dediprog_set_spi_speed(uint16_t speed)
{
	int ret;
	unsigned int khz;

	/* Case 1 and 2 are in weird order. Probably an organically "grown"
	 * interface.
	 * Base frequency is 24000 kHz, divisors are (in order)
	 * 1, 3, 2, 8, 11, 16, 32, 64.
	 */
	switch (speed) {
	case 0x0:
		khz = 24000;
		break;
	case 0x1:
		khz = 8000;
		break;
	case 0x2:
		khz = 12000;
		break;
	case 0x3:
		khz = 3000;
		break;
	case 0x4:
		khz = 2180;
		break;
	case 0x5:
		khz = 1500;
		break;
	case 0x6:
		khz = 750;
		break;
	case 0x7:
		khz = 375;
		break;
	default:
		msg_perr("Unknown frequency selector 0x%x! Aborting.\n", speed);
		return 1;
	}
	msg_pdbg("Setting SPI speed to %u kHz\n", khz);

	ret = usb_control_msg(dediprog_handle, 0x42, 0x61, speed, 0xff, NULL,
			      0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command Set SPI Speed 0x%x failed!\n", speed);
		return 1;
	}
	return 0;
}
#endif

/* Bulk read interface, will read multiple 512 byte chunks aligned to 512 bytes.
 * @start	start address
 * @len		length
 * @return	0 on success, 1 on failure
 */
static int dediprog_spi_bulk_read(struct flashctx *flash, uint8_t *buf,
				  unsigned int start, unsigned int len)
{
	int ret;
	unsigned int i;
	/* chunksize must be 512, other sizes will NOT work at all. */
	const unsigned int chunksize = 0x200;
	const unsigned int count = len / chunksize;
	const char count_and_chunk[] = {count & 0xff,
					(count >> 8) & 0xff,
					chunksize & 0xff,
					(chunksize >> 8) & 0xff};

	if ((start % chunksize) || (len % chunksize)) {
		msg_perr("%s: Unaligned start=%i, len=%i! Please report a bug "
			 "at flashrom@flashrom.org\n", __func__, start, len);
		return 1;
	}

	/* No idea if the hardware can handle empty reads, so chicken out. */
	if (!len)
		return 0;
	/* Command Read SPI Bulk. No idea which read command is used on the
	 * SPI side.
	 */
	ret = usb_control_msg(dediprog_handle, 0x42, 0x20, start % 0x10000,
			      start / 0x10000, (char *)count_and_chunk,
			      sizeof(count_and_chunk), DEFAULT_TIMEOUT);
	if (ret != sizeof(count_and_chunk)) {
		msg_perr("Command Read SPI Bulk failed, %i %s!\n", ret,
			 usb_strerror());
		return 1;
	}

	for (i = 0; i < count; i++) {
		ret = usb_bulk_read(dediprog_handle, 0x80 | dediprog_endpoint,
				    (char *)buf + i * chunksize, chunksize,
				    DEFAULT_TIMEOUT);
		if (ret != chunksize) {
			msg_perr("SPI bulk read %i failed, expected %i, got %i "
				 "%s!\n", i, chunksize, ret, usb_strerror());
			return 1;
		}
	}

	return 0;
}

static int dediprog_spi_read(struct flashctx *flash, uint8_t *buf,
			     unsigned int start, unsigned int len)
{
	int ret;
	/* chunksize must be 512, other sizes will NOT work at all. */
	const unsigned int chunksize = 0x200;
	unsigned int residue = start % chunksize ? chunksize - start % chunksize : 0;
	unsigned int bulklen;

	dediprog_set_leds(PASS_OFF|BUSY_ON|ERROR_OFF);

	if (residue) {
		msg_pdbg("Slow read for partial block from 0x%x, length 0x%x\n",
			 start, residue);
		ret = spi_read_chunked(flash, buf, start, residue, 16);
		if (ret) {
			dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
			return ret;
		}
	}

	/* Round down. */
	bulklen = (len - residue) / chunksize * chunksize;
	ret = dediprog_spi_bulk_read(flash, buf + residue, start + residue,
				     bulklen);
	if (ret) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return ret;
	}

	len -= residue + bulklen;
	if (len) {
		msg_pdbg("Slow read for partial block from 0x%x, length 0x%x\n",
			 start, len);
		ret = spi_read_chunked(flash, buf + residue + bulklen,
				       start + residue + bulklen, len, 16);
		if (ret) {
			dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
			return ret;
		}
	}

	dediprog_set_leds(PASS_ON|BUSY_OFF|ERROR_OFF);
	return 0;
}

/* Bulk write interface, will write multiple chunksize byte chunks aligned to chunksize bytes.
 * @chunksize       length of data chunks, only 256 supported by now
 * @start           start address
 * @len             length
 * @dedi_spi_cmd    dediprog specific write command for spi bus
 * @return          0 on success, 1 on failure
 */
static int dediprog_spi_bulk_write(struct flashctx *flash, uint8_t *buf, unsigned int chunksize,
				   unsigned int start, unsigned int len, uint8_t dedi_spi_cmd)
{
	int ret;
	unsigned int i;
	/* USB transfer size must be 512, other sizes will NOT work at all.
	 * chunksize is the real data size per USB bulk transfer. The remaining
	 * space in a USB bulk transfer must be filled with 0xff padding.
	 */
	const unsigned int count = len / chunksize;
	const char count_and_cmd[] = {count & 0xff, (count >> 8) & 0xff, 0x00, dedi_spi_cmd};
	char usbbuf[512];

	/*
	 * We should change this check to
	 *   chunksize > 512
	 * once we know how to handle different chunk sizes.
	 */
	if (chunksize != 256) {
		msg_perr("%s: Chunk sizes other than 256 bytes are unsupported, chunksize=%u!\n"
			 "Please report a bug at flashrom@flashrom.org\n", __func__, chunksize);
		return 1;
	}

	if ((start % chunksize) || (len % chunksize)) {
		msg_perr("%s: Unaligned start=%i, len=%i! Please report a bug "
			 "at flashrom@flashrom.org\n", __func__, start, len);
		return 1;
	}

	/* No idea if the hardware can handle empty writes, so chicken out. */
	if (!len)
		return 0;
	/* Command Write SPI Bulk. No idea which write command is used on the
	 * SPI side.
	 */
	ret = usb_control_msg(dediprog_handle, 0x42, 0x30, start % 0x10000, start / 0x10000,
			      (char *)count_and_cmd, sizeof(count_and_cmd), DEFAULT_TIMEOUT);
	if (ret != sizeof(count_and_cmd)) {
		msg_perr("Command Write SPI Bulk failed, %i %s!\n", ret,
			 usb_strerror());
		return 1;
	}

	for (i = 0; i < count; i++) {
		memset(usbbuf, 0xff, sizeof(usbbuf));
		memcpy(usbbuf, buf + i * chunksize, chunksize);
		ret = usb_bulk_write(dediprog_handle, dediprog_endpoint,
				    usbbuf, 512,
				    DEFAULT_TIMEOUT);
		if (ret != 512) {
			msg_perr("SPI bulk write failed, expected %i, got %i "
				 "%s!\n", 512, ret, usb_strerror());
			return 1;
		}
	}

	return 0;
}

static int dediprog_spi_write(struct flashctx *flash, uint8_t *buf,
			      unsigned int start, unsigned int len, uint8_t dedi_spi_cmd)
{
	int ret;
	const unsigned int chunksize = flash->page_size;
	unsigned int residue = start % chunksize ? chunksize - start % chunksize : 0;
	unsigned int bulklen;

	dediprog_set_leds(PASS_OFF|BUSY_ON|ERROR_OFF);

	if (chunksize != 256) {
		msg_pdbg("Page sizes other than 256 bytes are unsupported as "
			 "we don't know how dediprog\nhandles them.\n");
		/* Write everything like it was residue. */
		residue = len;
	}

	if (residue) {
		msg_pdbg("Slow write for partial block from 0x%x, length 0x%x\n",
			 start, residue);
		/* No idea about the real limit. Maybe 12, maybe more. */
		ret = spi_write_chunked(flash, buf, start, residue, 12);
		if (ret) {
			dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
			return ret;
		}
	}

	/* Round down. */
	bulklen = (len - residue) / chunksize * chunksize;
	ret = dediprog_spi_bulk_write(flash, buf + residue, chunksize, start + residue, bulklen, dedi_spi_cmd);
	if (ret) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return ret;
	}

	len -= residue + bulklen;
	if (len) {
		msg_pdbg("Slow write for partial block from 0x%x, length 0x%x\n",
			 start, len);
		ret = spi_write_chunked(flash, buf + residue + bulklen,
				        start + residue + bulklen, len, 12);
		if (ret) {
			dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
			return ret;
		}
	}

	dediprog_set_leds(PASS_ON|BUSY_OFF|ERROR_OFF);
	return 0;
}

static int dediprog_spi_write_256(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len)
{
	return dediprog_spi_write(flash, buf, start, len, DEDI_SPI_CMD_PAGEWRITE);
}

static int dediprog_spi_write_aai(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len)
{
	return dediprog_spi_write(flash, buf, start, len, DEDI_SPI_CMD_AAIWRITE);
}

static int dediprog_spi_send_command(struct flashctx *flash,
				     unsigned int writecnt,
				     unsigned int readcnt,
				     const unsigned char *writearr,
				     unsigned char *readarr)
{
	int ret;

	msg_pspew("%s, writecnt=%i, readcnt=%i\n", __func__, writecnt, readcnt);
	/* Paranoid, but I don't want to be blamed if anything explodes. */
	if (writecnt > 16) {
		msg_perr("Untested writecnt=%i, aborting.\n", writecnt);
		return 1;
	}
	/* 16 byte reads should work. */
	if (readcnt > 16) {
		msg_perr("Untested readcnt=%i, aborting.\n", readcnt);
		return 1;
	}
	
	ret = usb_control_msg(dediprog_handle, 0x42, 0x1, 0xff,
			      readcnt ? 0x1 : 0x0, (char *)writearr, writecnt,
			      DEFAULT_TIMEOUT);
	if (ret != writecnt) {
		msg_perr("Send SPI failed, expected %i, got %i %s!\n",
			 writecnt, ret, usb_strerror());
		return 1;
	}
	if (!readcnt)
		return 0;
	memset(readarr, 0, readcnt);
	ret = usb_control_msg(dediprog_handle, 0xc2, 0x01, 0xbb8, 0x0000,
			     (char *)readarr, readcnt, DEFAULT_TIMEOUT);
	if (ret != readcnt) {
		msg_perr("Receive SPI failed, expected %i, got %i %s!\n",
			 readcnt, ret, usb_strerror());
		return 1;
	}
	return 0;
}

static int dediprog_check_devicestring(void)
{
	int ret;
	int fw[3];
	char buf[0x11];

	/* Command Prepare Receive Device String. */
	memset(buf, 0, sizeof(buf));
	ret = usb_control_msg(dediprog_handle, 0xc3, 0x7, 0x0, 0xef03, buf,
			      0x1, DEFAULT_TIMEOUT);
	/* The char casting is needed to stop gcc complaining about an always true comparison. */
	if ((ret != 0x1) || (buf[0] != (char)0xff)) {
		msg_perr("Unexpected response to Command Prepare Receive Device"
			 " String!\n");
		return 1;
	}
	/* Command Receive Device String. */
	memset(buf, 0, sizeof(buf));
	ret = usb_control_msg(dediprog_handle, 0xc2, 0x8, 0xff, 0xff, buf,
			      0x10, DEFAULT_TIMEOUT);
	if (ret != 0x10) {
		msg_perr("Incomplete/failed Command Receive Device String!\n");
		return 1;
	}
	buf[0x10] = '\0';
	msg_pdbg("Found a %s\n", buf);
	if (memcmp(buf, "SF100", 0x5)) {
		msg_perr("Device not a SF100!\n");
		return 1;
	}
	if (sscanf(buf, "SF100 V:%d.%d.%d ", &fw[0], &fw[1], &fw[2]) != 3) {
		msg_perr("Unexpected firmware version string!\n");
		return 1;
	}
	/* Only these versions were tested. */
	if (fw[0] < 2 || fw[0] > 5) {
		msg_perr("Unexpected firmware version %d.%d.%d!\n", fw[0],
			 fw[1], fw[2]);
		return 1;
	}
	dediprog_firmwareversion = FIRMWARE_VERSION(fw[0], fw[1], fw[2]);
	return 0;
}

/* Command A seems to be some sort of device init. It is either followed by
 * dediprog_check_devicestring (often) or Command A (often) or
 * Command F (once).
 */
static int dediprog_command_a(void)
{
	int ret;
	char buf[0x1];

	memset(buf, 0, sizeof(buf));
	ret = usb_control_msg(dediprog_handle, 0xc3, 0xb, 0x0, 0x0, buf,
			      0x1, DEFAULT_TIMEOUT);
	if (ret < 0) {
		msg_perr("Command A failed (%s)!\n", usb_strerror());
		return 1;
	}
	if ((ret != 0x1) || (buf[0] != 0x6f)) {
		msg_perr("Unexpected response to Command A!\n");
		return 1;
	}
	return 0;
}

#if 0
/* Something.
 * Present in eng_detect_blink.log with firmware 3.1.8
 * Always preceded by Command Receive Device String
 */
static int dediprog_command_b(void)
{
	int ret;
	char buf[0x3];

	memset(buf, 0, sizeof(buf));
	ret = usb_control_msg(dediprog_handle, 0xc3, 0x7, 0x0, 0xef00, buf,
			      0x3, DEFAULT_TIMEOUT);
	if (ret < 0) {
		msg_perr("Command B failed (%s)!\n", usb_strerror());
		return 1;
	}
	if ((ret != 0x3) || (buf[0] != 0xff) || (buf[1] != 0xff) ||
	    (buf[2] != 0xff)) {
		msg_perr("Unexpected response to Command B!\n");
		return 1;
	}

	return 0;
}
#endif

/* Command C is only sent after dediprog_check_devicestring, but not after every
 * invocation of dediprog_check_devicestring. It is only sent after the first
 * dediprog_command_a(); dediprog_check_devicestring() sequence in each session.
 * I'm tempted to call this one start_SPI_engine or finish_init.
 */
static int dediprog_command_c(void)
{
	int ret;

	ret = usb_control_msg(dediprog_handle, 0x42, 0x4, 0x0, 0x0, NULL,
			      0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command C failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}

#if 0
/* Very strange. Seems to be a programmer keepalive or somesuch.
 * Wait unsuccessfully for timeout ms to read one byte.
 * Is usually called after setting voltage to 0.
 * Present in all logs with Firmware 2.1.1 and 3.1.8
 */
static int dediprog_command_f(int timeout)
{
	int ret;
	char buf[0x1];

	memset(buf, 0, sizeof(buf));
	ret = usb_control_msg(dediprog_handle, 0xc2, 0x11, 0xff, 0xff, buf,
			      0x1, timeout);
	/* This check is most probably wrong. Command F always causes a timeout
	 * in the logs, so we should check for timeout instead of checking for
	 * success.
	 */
	if (ret != 0x1) {
		msg_perr("Command F failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}

/* Start/stop blinking?
 * Present in eng_detect_blink.log with firmware 3.1.8
 * Preceded by Command J
 */
static int dediprog_command_g(void)
{
	int ret;

	ret = usb_control_msg(dediprog_handle, 0x42, 0x07, 0x09, 0x03, NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command G failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}

/* Something.
 * Present in all logs with firmware 5.1.5
 * Always preceded by Command Receive Device String
 * Always followed by Command Set SPI Voltage nonzero
 */
static int dediprog_command_h(void)
{
	int ret;

	ret = usb_control_msg(dediprog_handle, 0x42, 0x07, 0x09, 0x05, NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command H failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}

/* Shutdown for firmware 5.x?
 * Present in all logs with firmware 5.1.5
 * Often preceded by a SPI operation (Command Read SPI Bulk or Receive SPI)
 * Always followed by Command Set SPI Voltage 0x0000
 */
static int dediprog_command_i(void)
{
	int ret;

	ret = usb_control_msg(dediprog_handle, 0x42, 0x07, 0x09, 0x06, NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command I failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}

/* Start/stop blinking?
 * Present in all logs with firmware 5.1.5
 * Always preceded by Command Receive Device String on 5.1.5
 * Always followed by Command Set SPI Voltage nonzero on 5.1.5
 * Present in eng_detect_blink.log with firmware 3.1.8
 * Preceded by Command B in eng_detect_blink.log
 * Followed by Command G in eng_detect_blink.log
 */
static int dediprog_command_j(void)
{
	int ret;

	ret = usb_control_msg(dediprog_handle, 0x42, 0x07, 0x09, 0x07, NULL, 0x0, DEFAULT_TIMEOUT);
	if (ret != 0x0) {
		msg_perr("Command J failed (%s)!\n", usb_strerror());
		return 1;
	}
	return 0;
}
#endif

static int parse_voltage(char *voltage)
{
	char *tmp = NULL;
	int i;
	int millivolt = 0, fraction = 0;

	if (!voltage || !strlen(voltage)) {
		msg_perr("Empty voltage= specified.\n");
		return -1;
	}
	millivolt = (int)strtol(voltage, &tmp, 0);
	voltage = tmp;
	/* Handle "," and "." as decimal point. Everything after it is assumed
	 * to be in decimal notation.
	 */
	if ((*voltage == '.') || (*voltage == ',')) {
		voltage++;
		for (i = 0; i < 3; i++) {
			fraction *= 10;
			/* Don't advance if the current character is invalid,
			 * but continue multiplying.
			 */
			if ((*voltage < '0') || (*voltage > '9'))
				continue;
			fraction += *voltage - '0';
			voltage++;
		}
		/* Throw away remaining digits. */
		voltage += strspn(voltage, "0123456789");
	}
	/* The remaining string must be empty or "mV" or "V". */
	tolower_string(voltage);

	/* No unit or "V". */
	if ((*voltage == '\0') || !strncmp(voltage, "v", 1)) {
		millivolt *= 1000;
		millivolt += fraction;
	} else if (!strncmp(voltage, "mv", 2) ||
		   !strncmp(voltage, "milliv", 6)) {
		/* No adjustment. fraction is discarded. */
	} else {
		/* Garbage at the end of the string. */
		msg_perr("Garbage voltage= specified.\n");
		return -1;
	}
	return millivolt;
}

static const struct spi_programmer spi_programmer_dediprog = {
	.type		= SPI_CONTROLLER_DEDIPROG,
	.max_data_read	= MAX_DATA_UNSPECIFIED,
	.max_data_write	= MAX_DATA_UNSPECIFIED,
	.command	= dediprog_spi_send_command,
	.multicommand	= default_spi_send_multicommand,
	.read		= dediprog_spi_read,
	.write_256	= dediprog_spi_write_256,
	.write_aai	= dediprog_spi_write_aai,
};

static int dediprog_shutdown(void *data)
{
	msg_pspew("%s\n", __func__);

#if 0
	/* Shutdown on firmware 5.x */
	if (dediprog_firmwareversion == 5)
		if (dediprog_command_i())
			return 1;
#endif

	/* URB 28. Command Set SPI Voltage to 0. */
	if (dediprog_set_spi_voltage(0x0))
		return 1;

	if (usb_release_interface(dediprog_handle, 0)) {
		msg_perr("Could not release USB interface!\n");
		return 1;
	}
	if (usb_close(dediprog_handle)) {
		msg_perr("Could not close USB device!\n");
		return 1;
	}
	return 0;
}

/* URB numbers refer to the first log ever captured. */
int dediprog_init(void)
{
	struct usb_device *dev;
	char *voltage;
	int millivolt = 3500;
	int ret;

	msg_pspew("%s\n", __func__);

	voltage = extract_programmer_param("voltage");
	if (voltage) {
		millivolt = parse_voltage(voltage);
		free(voltage);
		if (millivolt < 0)
			return 1;
		msg_pinfo("Setting voltage to %i mV\n", millivolt);
	}

	/* Here comes the USB stuff. */
	usb_init();
	usb_find_busses();
	usb_find_devices();
	dev = get_device_by_vid_pid(0x0483, 0xdada);
	if (!dev) {
		msg_perr("Could not find a Dediprog SF100 on USB!\n");
		return 1;
	}
	msg_pdbg("Found USB device (%04x:%04x).\n",
		 dev->descriptor.idVendor, dev->descriptor.idProduct);
	dediprog_handle = usb_open(dev);
	ret = usb_set_configuration(dediprog_handle, 1);
	if (ret < 0) {
		msg_perr("Could not set USB device configuration: %i %s\n",
			 ret, usb_strerror());
		if (usb_close(dediprog_handle))
			msg_perr("Could not close USB device!\n");
		return 1;
	}
	ret = usb_claim_interface(dediprog_handle, 0);
	if (ret < 0) {
		msg_perr("Could not claim USB device interface %i: %i %s\n",
			 0, ret, usb_strerror());
		if (usb_close(dediprog_handle))
			msg_perr("Could not close USB device!\n");
		return 1;
	}
	dediprog_endpoint = 2;
	
	if (register_shutdown(dediprog_shutdown, NULL))
		return 1;

	dediprog_set_leds(PASS_ON|BUSY_ON|ERROR_ON);

	/* URB 6. Command A. */
	if (dediprog_command_a()) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return 1;
	}
	/* URB 7. Command A. */
	if (dediprog_command_a()) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return 1;
	}
	/* URB 8. Command Prepare Receive Device String. */
	/* URB 9. Command Receive Device String. */
	if (dediprog_check_devicestring()) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return 1;
	}
	/* URB 10. Command C. */
	if (dediprog_command_c()) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return 1;
	}
	/* URB 11. Command Set SPI Voltage. */
	if (dediprog_set_spi_voltage(millivolt)) {
		dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_ON);
		return 1;
	}

	register_spi_programmer(&spi_programmer_dediprog);

	/* RE leftover, leave in until the driver is complete. */
#if 0
	/* Execute RDID by hand if you want to test it. */
	dediprog_do_stuff();
#endif

	dediprog_set_leds(PASS_OFF|BUSY_OFF|ERROR_OFF);

	return 0;
}

#if 0
/* Leftovers from reverse engineering. Keep for documentation purposes until
 * completely understood.
 */
static int dediprog_do_stuff(void)
{
	char buf[0x4];
	/* SPI command processing starts here. */

	/* URB 12. Command Send SPI. */
	/* URB 13. Command Receive SPI. */
	memset(buf, 0, sizeof(buf));
	/* JEDEC RDID */
	msg_pdbg("Sending RDID\n");
	buf[0] = JEDEC_RDID;
	if (dediprog_spi_send_command(JEDEC_RDID_OUTSIZE, JEDEC_RDID_INSIZE,
				(unsigned char *)buf, (unsigned char *)buf))
		return 1;
	msg_pdbg("Receiving response: ");
	print_hex(buf, JEDEC_RDID_INSIZE);
	/* URB 14-27 are more SPI commands. */
	/* URB 28. Command Set SPI Voltage. */
	if (dediprog_set_spi_voltage(0x0))
		return 1;
	/* URB 29-38. Command F, unsuccessful wait. */
	if (dediprog_command_f(544))
		return 1;
	/* URB 39. Command Set SPI Voltage. */
	if (dediprog_set_spi_voltage(0x10))
		return 1;
	/* URB 40. Command Set SPI Speed. */
	if (dediprog_set_spi_speed(0x2))
		return 1;
	/* URB 41 is just URB 28. */
	/* URB 42,44,46,48,51,53 is just URB 8. */
	/* URB 43,45,47,49,52,54 is just URB 9. */
	/* URB 50 is just URB 6/7. */
	/* URB 55-131 is just URB 29-38. (wait unsuccessfully for 4695 (maybe 4751) ms)*/
	/* URB 132,134 is just URB 6/7. */
	/* URB 133 is just URB 29-38. */
	/* URB 135 is just URB 8. */
	/* URB 136 is just URB 9. */
	/* URB 137 is just URB 11. */

	/* Command Start Bulk Read. Data is u16 blockcount, u16 blocksize. */
	/* Command Start Bulk Write. Data is u16 blockcount, u16 blocksize. */
	/* Bulk transfer sizes for Command Start Bulk Read/Write are always
	 * 512 bytes, rest is filled with 0xff.
	 */

	return 0;
}
#endif	
OpenPOWER on IntegriCloud