summaryrefslogtreecommitdiff
path: root/backend/lexmark.c
blob: 3c171c7790f3224e51825aca8a1f6a722238f43b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
/* lexmark.c: SANE backend for Lexmark scanners.

   (C) 2003-2004 Lexmark International, Inc. (Original Source code)
   (C) 2005 Fred Odendaal
   (C) 2006-2013 Stéphane Voltz <stef.dev@free.fr>
   (C) 2010 "Torsten Houwaart" <ToHo@gmx.de> X74 support

   This file is part of the SANE package.

   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, see <https://www.gnu.org/licenses/>.

   As a special exception, the authors of SANE give permission for
   additional uses of the libraries contained in this release of SANE.

   The exception is that, if you link a SANE library with other files
   to produce an executable, this does not by itself cause the
   resulting executable to be covered by the GNU General Public
   License.  Your use of that executable is in no way restricted on
   account of linking the SANE library code into it.

   This exception does not, however, invalidate any other reasons why
   the executable file might be covered by the GNU General Public
   License.

   If you submit changes to SANE to the maintainers to be included in
   a subsequent release, you agree by submitting the changes that
   those changes may be distributed with this exception intact.

   If you write modifications of your own for SANE, it is your choice
   whether to permit this exception to apply to your modifications.
   If you do not wish that, delete this exception notice.

   **************************************************************************/

#include "lexmark.h"

#define LEXMARK_CONFIG_FILE "lexmark.conf"
#define BUILD 32
#define MAX_OPTION_STRING_SIZE 255

static Lexmark_Device *first_lexmark_device = 0;
static SANE_Int num_lexmark_device = 0;
static const SANE_Device **sane_device_list = NULL;

/* Program globals F.O - Should this be per device?*/
static SANE_Bool initialized = SANE_FALSE;

static SANE_String_Const mode_list[] = {
  SANE_VALUE_SCAN_MODE_COLOR,
  SANE_VALUE_SCAN_MODE_GRAY,
  SANE_VALUE_SCAN_MODE_LINEART,
  NULL
};

/* possible resolutions are: 75x75, 150x150, 300x300, 600x600, 600x1200 */

static SANE_Int x1100_dpi_list[] = {
  5, 75, 150, 300, 600, 1200
};

static SANE_Int a920_dpi_list[] = {
  4, 75, 150, 300, 600
};

static SANE_Int x1200_dpi_list[] = {
  4, 75, 150, 300, 600
};

static SANE_Int x74_dpi_list[] = {
  75, 150, 300, 600
};

static SANE_Range threshold_range = {
  SANE_FIX (0.0),		/* minimum */
  SANE_FIX (100.0),		/* maximum */
  SANE_FIX (1.0)		/* quantization */
};

static const SANE_Range gain_range = {
  0,				/* minimum */
  31,				/* maximum */
  0				/* quantization */
};

/* for now known models (2 ...) have the same scan window geometry.
   coordinates are expressed in pixels, with a quantization factor of
   8 to have 'even' coordinates at 75 dpi */
static SANE_Range x_range = {
  0,				/* minimum */
  5104,				/* maximum */
  16				/* quantization : 16 is required so we
				   never have an odd width */
};

static SANE_Range y_range = {
  0,				/* minimum */
  6848,				/* maximum */
  /* 7032, for X74 */
  8				/* quantization */
};

/* static functions */
static SANE_Status init_options (Lexmark_Device * lexmark_device);
static SANE_Status attachLexmark (SANE_String_Const devname);

SANE_Status
init_options (Lexmark_Device * dev)
{

  SANE_Option_Descriptor *od;

  DBG (2, "init_options: dev = %p\n", (void *) dev);

  /* number of options */
  od = &(dev->opt[OPT_NUM_OPTS]);
  od->name = SANE_NAME_NUM_OPTIONS;
  od->title = SANE_TITLE_NUM_OPTIONS;
  od->desc = SANE_DESC_NUM_OPTIONS;
  od->type = SANE_TYPE_INT;
  od->unit = SANE_UNIT_NONE;
  od->size = sizeof (SANE_Word);
  od->cap = SANE_CAP_SOFT_DETECT;
  od->constraint_type = SANE_CONSTRAINT_NONE;
  od->constraint.range = 0;
  dev->val[OPT_NUM_OPTS].w = NUM_OPTIONS;

  /* mode - sets the scan mode: Color, Gray, or Line Art */
  od = &(dev->opt[OPT_MODE]);
  od->name = SANE_NAME_SCAN_MODE;
  od->title = SANE_TITLE_SCAN_MODE;
  od->desc = SANE_DESC_SCAN_MODE;;
  od->type = SANE_TYPE_STRING;
  od->unit = SANE_UNIT_NONE;
  od->size = MAX_OPTION_STRING_SIZE;
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->constraint_type = SANE_CONSTRAINT_STRING_LIST;
  od->constraint.string_list = mode_list;
  dev->val[OPT_MODE].s = malloc (od->size);
  if (!dev->val[OPT_MODE].s)
    return SANE_STATUS_NO_MEM;
  strcpy (dev->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_COLOR);

  /* resolution */
  od = &(dev->opt[OPT_RESOLUTION]);
  od->name = SANE_NAME_SCAN_RESOLUTION;
  od->title = SANE_TITLE_SCAN_RESOLUTION;
  od->desc = SANE_DESC_SCAN_RESOLUTION;
  od->type = SANE_TYPE_INT;
  od->unit = SANE_UNIT_DPI;
  od->size = sizeof (SANE_Word);
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->constraint_type = SANE_CONSTRAINT_WORD_LIST;
  switch (dev->model.sensor_type)
    {
    case X1100_2C_SENSOR:
    case A920_SENSOR:
      od->constraint.word_list = a920_dpi_list;
      break;
    case X1100_B2_SENSOR:
      od->constraint.word_list = x1100_dpi_list;
      break;
    case X1200_SENSOR:
    case X1200_USB2_SENSOR:
      od->constraint.word_list = x1200_dpi_list;
      break;
    case X74_SENSOR:
      od->constraint.word_list = x74_dpi_list;
      break;
    }
  dev->val[OPT_RESOLUTION].w = 75;

  /* preview mode */
  od = &(dev->opt[OPT_PREVIEW]);
  od->name = SANE_NAME_PREVIEW;
  od->title = SANE_TITLE_PREVIEW;
  od->desc = SANE_DESC_PREVIEW;
  od->size = sizeof (SANE_Word);
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->type = SANE_TYPE_BOOL;
  od->constraint_type = SANE_CONSTRAINT_NONE;
  dev->val[OPT_PREVIEW].w = SANE_FALSE;

  /* "Geometry" group: */
  od = &(dev->opt[OPT_GEOMETRY_GROUP]);
  od->name = "";
  od->title = SANE_I18N ("Geometry");
  od->desc = "";
  od->type = SANE_TYPE_GROUP;
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->size = 0;
  od->constraint_type = SANE_CONSTRAINT_NONE;

  /* top-left x */
  od = &(dev->opt[OPT_TL_X]);
  od->name = SANE_NAME_SCAN_TL_X;
  od->title = SANE_TITLE_SCAN_TL_X;
  od->desc = SANE_DESC_SCAN_TL_X;
  od->type = SANE_TYPE_INT;
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->size = sizeof (SANE_Word);
  od->unit = SANE_UNIT_PIXEL;
  od->constraint_type = SANE_CONSTRAINT_RANGE;
  od->constraint.range = &x_range;
  dev->val[OPT_TL_X].w = 0;

  /* top-left y */
  od = &(dev->opt[OPT_TL_Y]);
  od->name = SANE_NAME_SCAN_TL_Y;
  od->title = SANE_TITLE_SCAN_TL_Y;
  od->desc = SANE_DESC_SCAN_TL_Y;
  od->type = SANE_TYPE_INT;
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->size = sizeof (SANE_Word);
  od->unit = SANE_UNIT_PIXEL;
  od->constraint_type = SANE_CONSTRAINT_RANGE;
  od->constraint.range = &y_range;
  dev->val[OPT_TL_Y].w = 0;

  /* bottom-right x */
  od = &(dev->opt[OPT_BR_X]);
  od->name = SANE_NAME_SCAN_BR_X;
  od->title = SANE_TITLE_SCAN_BR_X;
  od->desc = SANE_DESC_SCAN_BR_X;
  od->type = SANE_TYPE_INT;
  od->size = sizeof (SANE_Word);
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->unit = SANE_UNIT_PIXEL;
  od->constraint_type = SANE_CONSTRAINT_RANGE;
  od->constraint.range = &x_range;
  dev->val[OPT_BR_X].w = x_range.max;

  /* bottom-right y */
  od = &(dev->opt[OPT_BR_Y]);
  od->name = SANE_NAME_SCAN_BR_Y;
  od->title = SANE_TITLE_SCAN_BR_Y;
  od->desc = SANE_DESC_SCAN_BR_Y;
  od->type = SANE_TYPE_INT;
  od->size = sizeof (SANE_Word);
  od->cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
  od->unit = SANE_UNIT_PIXEL;
  od->constraint_type = SANE_CONSTRAINT_RANGE;
  od->constraint.range = &y_range;
  dev->val[OPT_BR_Y].w = y_range.max;

  /* threshold */
  od = &(dev->opt[OPT_THRESHOLD]);
  od->name = SANE_NAME_THRESHOLD;
  od->title = SANE_TITLE_THRESHOLD;
  od->desc = SANE_DESC_THRESHOLD;
  od->type = SANE_TYPE_FIXED;
  od->unit = SANE_UNIT_PERCENT;
  od->size = sizeof (SANE_Fixed);
  od->cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT | SANE_CAP_INACTIVE;
  od->constraint_type = SANE_CONSTRAINT_RANGE;
  od->constraint.range = &threshold_range;
  dev->val[OPT_THRESHOLD].w = SANE_FIX (50.0);

  /*  gain group */
  dev->opt[OPT_MANUAL_GAIN].name = "manual-channel-gain";
  dev->opt[OPT_MANUAL_GAIN].title = SANE_I18N ("Gain");
  dev->opt[OPT_MANUAL_GAIN].desc = SANE_I18N ("Color channels gain settings");
  dev->opt[OPT_MANUAL_GAIN].type = SANE_TYPE_BOOL;
  dev->opt[OPT_MANUAL_GAIN].cap =
    SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_ADVANCED;
  dev->opt[OPT_MANUAL_GAIN].size = sizeof (SANE_Bool);
  dev->val[OPT_MANUAL_GAIN].w = SANE_FALSE;

  /* gray gain */
  dev->opt[OPT_GRAY_GAIN].name = "gray-gain";
  dev->opt[OPT_GRAY_GAIN].title = SANE_I18N ("Gray gain");
  dev->opt[OPT_GRAY_GAIN].desc = SANE_I18N ("Sets gray channel gain");
  dev->opt[OPT_GRAY_GAIN].type = SANE_TYPE_INT;
  dev->opt[OPT_GRAY_GAIN].cap =
    SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE |
    SANE_CAP_ADVANCED;
  dev->opt[OPT_GRAY_GAIN].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GRAY_GAIN].size = sizeof (SANE_Int);
  dev->opt[OPT_GRAY_GAIN].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GRAY_GAIN].constraint.range = &gain_range;
  dev->val[OPT_GRAY_GAIN].w = 10;

  /* red gain */
  dev->opt[OPT_RED_GAIN].name = "red-gain";
  dev->opt[OPT_RED_GAIN].title = SANE_I18N ("Red gain");
  dev->opt[OPT_RED_GAIN].desc = SANE_I18N ("Sets red channel gain");
  dev->opt[OPT_RED_GAIN].type = SANE_TYPE_INT;
  dev->opt[OPT_RED_GAIN].cap =
    SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE |
    SANE_CAP_ADVANCED;
  dev->opt[OPT_RED_GAIN].unit = SANE_UNIT_NONE;
  dev->opt[OPT_RED_GAIN].size = sizeof (SANE_Int);
  dev->opt[OPT_RED_GAIN].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_RED_GAIN].constraint.range = &gain_range;
  dev->val[OPT_RED_GAIN].w = 10;

  /* green gain */
  dev->opt[OPT_GREEN_GAIN].name = "green-gain";
  dev->opt[OPT_GREEN_GAIN].title = SANE_I18N ("Green gain");
  dev->opt[OPT_GREEN_GAIN].desc = SANE_I18N ("Sets green channel gain");
  dev->opt[OPT_GREEN_GAIN].type = SANE_TYPE_INT;
  dev->opt[OPT_GREEN_GAIN].cap =
    SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE |
    SANE_CAP_ADVANCED;
  dev->opt[OPT_GREEN_GAIN].unit = SANE_UNIT_NONE;
  dev->opt[OPT_GREEN_GAIN].size = sizeof (SANE_Int);
  dev->opt[OPT_GREEN_GAIN].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_GREEN_GAIN].constraint.range = &gain_range;
  dev->val[OPT_GREEN_GAIN].w = 10;

  /* blue gain */
  dev->opt[OPT_BLUE_GAIN].name = "blue-gain";
  dev->opt[OPT_BLUE_GAIN].title = SANE_I18N ("Blue gain");
  dev->opt[OPT_BLUE_GAIN].desc = SANE_I18N ("Sets blue channel gain");
  dev->opt[OPT_BLUE_GAIN].type = SANE_TYPE_INT;
  dev->opt[OPT_BLUE_GAIN].cap =
    SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT | SANE_CAP_INACTIVE |
    SANE_CAP_ADVANCED;
  dev->opt[OPT_BLUE_GAIN].unit = SANE_UNIT_NONE;
  dev->opt[OPT_BLUE_GAIN].size = sizeof (SANE_Int);
  dev->opt[OPT_BLUE_GAIN].constraint_type = SANE_CONSTRAINT_RANGE;
  dev->opt[OPT_BLUE_GAIN].constraint.range = &gain_range;
  dev->val[OPT_BLUE_GAIN].w = 10;

  return SANE_STATUS_GOOD;
}


/***************************** SANE API ****************************/

SANE_Status
attachLexmark (SANE_String_Const devname)
{
  Lexmark_Device *lexmark_device;
  SANE_Int dn, vendor, product, variant;
  SANE_Status status;

  DBG (2, "attachLexmark: devname=%s\n", devname);

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      /* already attached devices */
      if (strcmp (lexmark_device->sane.name, devname) == 0)
      {
        lexmark_device->missing = SANE_FALSE;
	return SANE_STATUS_GOOD;
      }
    }

  lexmark_device = (Lexmark_Device *) malloc (sizeof (Lexmark_Device));
  if (lexmark_device == NULL)
    return SANE_STATUS_NO_MEM;

#ifdef FAKE_USB
  status = SANE_STATUS_GOOD;
#else
  status = sanei_usb_open (devname, &dn);
#endif
  if (status != SANE_STATUS_GOOD)
    {
      DBG (1, "attachLexmark: couldn't open device `%s': %s\n", devname,
	   sane_strstatus (status));
      return status;
    }
  else
    DBG (2, "attachLexmark: device `%s' successfully opened\n", devname);

#ifdef FAKE_USB
  status = SANE_STATUS_GOOD;
  /* put the id of the model you want to fake here */
  vendor = 0x043d;
  product = 0x007c;		/* X11xx */
  variant = 0xb2;
#else
  variant = 0;
  status = sanei_usb_get_vendor_product (dn, &vendor, &product);
#endif
  if (status != SANE_STATUS_GOOD)
    {
      DBG (1,
	   "attachLexmark: couldn't get vendor and product ids of device `%s': %s\n",
	   devname, sane_strstatus (status));
#ifndef FAKE_USB
      sanei_usb_close (dn);
#endif
      return status;
    }
#ifndef FAKE_USB
  sanei_usb_close (dn);
#endif

  DBG (2, "attachLexmark: testing device `%s': 0x%04x:0x%04x, variant=%d\n",
       devname, vendor, product, variant);
  if (sanei_lexmark_low_assign_model (lexmark_device,
				      devname,
				      vendor,
				      product, variant) != SANE_STATUS_GOOD)
    {
      DBG (2, "attachLexmark: unsupported device `%s': 0x%04x:0x%04x\n",
	   devname, vendor, product);
      return SANE_STATUS_UNSUPPORTED;
    }

  /* add new device to device list */

  /* there are two variant of the scanner with the same USB id,
   * so we need to read registers from scanner to detect which one
   * is really connected */
  status = sanei_lexmark_low_open_device (lexmark_device);
  sanei_usb_close (lexmark_device->devnum);

  /* set up scanner start status */
  sanei_lexmark_low_init (lexmark_device);

  /* Set the default resolution here */
  lexmark_device->x_dpi = 75;
  lexmark_device->y_dpi = 75;

  /* Make the pointer to the read buffer null here */
  lexmark_device->read_buffer = NULL;

  /* Set the default threshold for lineart mode here */
  lexmark_device->threshold = 0x80;

  lexmark_device->shading_coeff = NULL;

  /* mark device as present */
  lexmark_device->missing = SANE_FALSE;

  /* insert it a the start of the chained list */
  lexmark_device->next = first_lexmark_device;
  first_lexmark_device = lexmark_device;

  num_lexmark_device++;

  return status;
}

/** probe for supported lexmark devices
 * This function scan usb and try to attached to scanner
 * configured in lexmark.conf .
 */
static SANE_Status
probe_lexmark_devices (void)
{
  FILE *fp;
  SANE_Char line[PATH_MAX];
  const char *lp;
  SANE_Int vendor, product;
  size_t len;
  Lexmark_Device *dev;

  /* mark already detected devices as missing, during device probe
   * detected devices will clear this flag */
  dev = first_lexmark_device;
  while (dev != NULL)
    {
      dev->missing = SANE_TRUE;
      dev = dev->next;
    }

  /* open config file, parse option and try to open
   * any device configure in it */
  fp = sanei_config_open (LEXMARK_CONFIG_FILE);
  if (!fp)
    {
      return SANE_STATUS_ACCESS_DENIED;
    }

  while (sanei_config_read (line, PATH_MAX, fp))
    {
      /* ignore comments */
      if (line[0] == '#')
	continue;
      len = strlen (line);

      /* delete newline characters at end */
      if (line[len - 1] == '\n')
	line[--len] = '\0';

      lp = sanei_config_skip_whitespace (line);
      /* skip empty lines */
      if (*lp == 0)
	continue;

      if (sscanf (lp, "usb %i %i", &vendor, &product) == 2)
	;
      else if (strncmp ("libusb", lp, 6) == 0)
	;
      else if ((strncmp ("usb", lp, 3) == 0) && isspace (lp[3]))
	{
	  lp += 3;
	  lp = sanei_config_skip_whitespace (lp);
	}
      else
	continue;

#ifdef FAKE_USB
      attachLexmark ("FAKE_USB");
#else
      sanei_usb_attach_matching_devices (lp, attachLexmark);
#endif
    }

  fclose (fp);
  return SANE_STATUS_GOOD;
}

SANE_Status
sane_init (SANE_Int * version_code,
	   SANE_Auth_Callback __sane_unused__ authorize)
{
  SANE_Status status;

  DBG_INIT ();

  DBG (1, "SANE Lexmark backend version %d.%d.%d-devel\n", SANE_CURRENT_MAJOR,
       SANE_CURRENT_MINOR, BUILD);

  DBG (2, "sane_init: version_code=%p\n", (void *) version_code);

  if (version_code)
    *version_code = SANE_VERSION_CODE (SANE_CURRENT_MAJOR, SANE_CURRENT_MINOR, BUILD);

#ifndef FAKE_USB
  sanei_usb_init ();
#endif

  status = probe_lexmark_devices ();

  if (status == SANE_STATUS_GOOD)
    {
      initialized = SANE_TRUE;
    }
  else
    {
      initialized = SANE_FALSE;
    }

  return status;
}

void
sane_exit (void)
{
  Lexmark_Device *lexmark_device, *next_lexmark_device;

  DBG (2, "sane_exit\n");

  if (!initialized)
    return;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = next_lexmark_device)
    {
      next_lexmark_device = lexmark_device->next;
      sanei_lexmark_low_destroy (lexmark_device);
      free (lexmark_device);
    }

  if (sane_device_list)
    free (sane_device_list);

  sanei_usb_exit();
  initialized = SANE_FALSE;

  return;
}

SANE_Status
sane_get_devices (const SANE_Device *** device_list, SANE_Bool local_only)
{
  Lexmark_Device *lexmark_device;
  SANE_Int index;

  DBG (2, "sane_get_devices: device_list=%p, local_only=%d\n",
       (void *) device_list, local_only);

  /* hot-plug case : detection of newly connected scanners */
  sanei_usb_scan_devices ();
  probe_lexmark_devices ();

  if (sane_device_list)
    free (sane_device_list);

  sane_device_list = malloc ((num_lexmark_device + 1) *
			     sizeof (sane_device_list[0]));

  if (!sane_device_list)
    return SANE_STATUS_NO_MEM;

  index = 0;
  lexmark_device = first_lexmark_device;
  while (lexmark_device != NULL)
    {
      if (lexmark_device->missing == SANE_FALSE)
	{
	  sane_device_list[index] = &(lexmark_device->sane);
	  index++;
	}
      lexmark_device = lexmark_device->next;
    }
  sane_device_list[index] = 0;

  *device_list = sane_device_list;

  return SANE_STATUS_GOOD;
}


/**
 * Open the backend, ie return the struct handle of a detected scanner
 * The struct returned is choosne if it matches the name given, which is
 * useful when several scanners handled by the backend have been detected.
 * However, special case empty string "" and "lexmark" pick the first
 * available handle.
 */
SANE_Status
sane_open (SANE_String_Const devicename, SANE_Handle * handle)
{
  Lexmark_Device *lexmark_device;
  SANE_Status status;

  DBG (2, "sane_open: devicename=\"%s\", handle=%p\n", devicename,
       (void *) handle);

  if (!initialized)
    {
      DBG (2, "sane_open: not initialized\n");
      return SANE_STATUS_INVAL;
    }

  if (!handle)
    {
      DBG (2, "sane_open: no handle\n");
      return SANE_STATUS_INVAL;
    }

  /* walk the linked list of scanner device until there is a match
   * with the device name */
  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      DBG (2, "sane_open: devname from list: %s\n",
	   lexmark_device->sane.name);
      if (strcmp (devicename, "") == 0
	  || strcmp (devicename, "lexmark") == 0
	  || strcmp (devicename, lexmark_device->sane.name) == 0)
	break;
    }

  *handle = lexmark_device;

  if (!lexmark_device)
    {
      DBG (2, "sane_open: Not a lexmark device\n");
      return SANE_STATUS_INVAL;
    }

  status = init_options (lexmark_device);
  if (status != SANE_STATUS_GOOD)
    return status;

  status = sanei_lexmark_low_open_device (lexmark_device);
  DBG (2, "sane_open: end.\n");

  return status;
}

void
sane_close (SANE_Handle handle)
{
  Lexmark_Device *lexmark_device;

  DBG (2, "sane_close: handle=%p\n", (void *) handle);

  if (!initialized)
    return;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (!lexmark_device)
    return;

  sanei_lexmark_low_close_device (lexmark_device);

  return;
}

const SANE_Option_Descriptor *
sane_get_option_descriptor (SANE_Handle handle, SANE_Int option)
{
  Lexmark_Device *lexmark_device;

  DBG (2, "sane_get_option_descriptor: handle=%p, option = %d\n",
       (void *) handle, option);

  if (!initialized)
    return NULL;

  /* Check for valid option number */
  if ((option < 0) || (option >= NUM_OPTIONS))
    return NULL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (!lexmark_device)
    return NULL;

  if (lexmark_device->opt[option].name)
    {
      DBG (2, "sane_get_option_descriptor: name=%s\n",
	   lexmark_device->opt[option].name);
    }

  return &(lexmark_device->opt[option]);
}

/* rebuilds parameters if needed, called each time SANE_INFO_RELOAD_OPTIONS
   is set */
static void
calc_parameters (Lexmark_Device * lexmark_device)
{
  if (strcmp (lexmark_device->val[OPT_MODE].s,
	      SANE_VALUE_SCAN_MODE_LINEART) == 0)
    {
      lexmark_device->opt[OPT_THRESHOLD].cap &= ~SANE_CAP_INACTIVE;
    }
  else
    {
      lexmark_device->opt[OPT_THRESHOLD].cap |= SANE_CAP_INACTIVE;
    }

  /* changing color mode implies changing gain setting */
  if (lexmark_device->val[OPT_MANUAL_GAIN].w == SANE_TRUE)
    {
      if (strcmp (lexmark_device->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_COLOR)
	  != 0)
	{
	  lexmark_device->opt[OPT_GRAY_GAIN].cap &= ~SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_RED_GAIN].cap |= SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_GREEN_GAIN].cap |= SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_BLUE_GAIN].cap |= SANE_CAP_INACTIVE;
	}
      else
	{
	  lexmark_device->opt[OPT_GRAY_GAIN].cap |= SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_RED_GAIN].cap &= ~SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_GREEN_GAIN].cap &= ~SANE_CAP_INACTIVE;
	  lexmark_device->opt[OPT_BLUE_GAIN].cap &= ~SANE_CAP_INACTIVE;
	}
    }
  else
    {
      lexmark_device->opt[OPT_GRAY_GAIN].cap |= SANE_CAP_INACTIVE;
      lexmark_device->opt[OPT_RED_GAIN].cap |= SANE_CAP_INACTIVE;
      lexmark_device->opt[OPT_GREEN_GAIN].cap |= SANE_CAP_INACTIVE;
      lexmark_device->opt[OPT_BLUE_GAIN].cap |= SANE_CAP_INACTIVE;
    }
}

SANE_Status
sane_control_option (SANE_Handle handle, SANE_Int option, SANE_Action action,
		     void *value, SANE_Int * info)
{
  Lexmark_Device *lexmark_device;
  SANE_Status status;
  SANE_Word w;

  DBG (2, "sane_control_option: handle=%p, opt=%d, act=%d, val=%p, info=%p\n",
       (void *) handle, option, action, (void *) value, (void *) info);

  if (!initialized)
    return SANE_STATUS_INVAL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (!lexmark_device)
    return SANE_STATUS_INVAL;

  if (value == NULL)
    return SANE_STATUS_INVAL;

  if (info != NULL)
    *info = 0;

  if (option < 0 || option >= NUM_OPTIONS)
    return SANE_STATUS_INVAL;

  if (lexmark_device->opt[option].type == SANE_TYPE_GROUP)
    return SANE_STATUS_INVAL;

  switch (action)
    {
    case SANE_ACTION_SET_AUTO:

      if (!SANE_OPTION_IS_SETTABLE (lexmark_device->opt[option].cap))
	return SANE_STATUS_INVAL;
      if (!(lexmark_device->opt[option].cap & SANE_CAP_AUTOMATIC))
	return SANE_STATUS_INVAL;
      break;

    case SANE_ACTION_SET_VALUE:

      if (!SANE_OPTION_IS_SETTABLE (lexmark_device->opt[option].cap))
        return SANE_STATUS_INVAL;

      /* Make sure boolean values are only TRUE or FALSE */
      if (lexmark_device->opt[option].type == SANE_TYPE_BOOL)
	{
	  if (!
	      ((*(SANE_Bool *) value == SANE_FALSE)
	       || (*(SANE_Bool *) value == SANE_TRUE)))
	    return SANE_STATUS_INVAL;
	}

      /* Check range constraints */
      if (lexmark_device->opt[option].constraint_type ==
	  SANE_CONSTRAINT_RANGE)
	{
	  status =
	    sanei_constrain_value (&(lexmark_device->opt[option]), value,
				   info);
	  if (status != SANE_STATUS_GOOD)
	    {
	      DBG (2, "SANE_CONTROL_OPTION: Bad value for range\n");
	      return SANE_STATUS_INVAL;
	    }
	}

      switch (option)
	{
	case OPT_NUM_OPTS:
	case OPT_RESOLUTION:
	  lexmark_device->val[option].w = *(SANE_Int *) value;
	  sane_get_parameters (handle, 0);
	  break;
	case OPT_TL_X:
	case OPT_TL_Y:
	case OPT_BR_X:
	case OPT_BR_Y:
	  DBG (2, "Option value set to %d (%s)\n", *(SANE_Word *) value,
	       lexmark_device->opt[option].name);
	  lexmark_device->val[option].w = *(SANE_Word *) value;
	  if (lexmark_device->val[OPT_TL_X].w >
	      lexmark_device->val[OPT_BR_X].w)
	    {
	      w = lexmark_device->val[OPT_TL_X].w;
	      lexmark_device->val[OPT_TL_X].w =
		lexmark_device->val[OPT_BR_X].w;
	      lexmark_device->val[OPT_BR_X].w = w;
	      if (info)
		*info |= SANE_INFO_RELOAD_PARAMS;
	    }
	  if (lexmark_device->val[OPT_TL_Y].w >
	      lexmark_device->val[OPT_BR_Y].w)
	    {
	      w = lexmark_device->val[OPT_TL_Y].w;
	      lexmark_device->val[OPT_TL_Y].w =
		lexmark_device->val[OPT_BR_Y].w;
	      lexmark_device->val[OPT_BR_Y].w = w;
	      if (info)
		*info |= SANE_INFO_RELOAD_PARAMS;
	    }
	  break;
	case OPT_THRESHOLD:
	  lexmark_device->val[option].w = *(SANE_Fixed *) value;
	  lexmark_device->threshold =
	    (0xFF * lexmark_device->val[option].w) / 100;
	  break;
	case OPT_PREVIEW:
	  lexmark_device->val[option].w = *(SANE_Int *) value;
	  if (*(SANE_Word *) value)
	    {
	      lexmark_device->y_dpi = lexmark_device->val[OPT_RESOLUTION].w;
	      lexmark_device->val[OPT_RESOLUTION].w = 75;
	    }
	  else
	    {
	      lexmark_device->val[OPT_RESOLUTION].w = lexmark_device->y_dpi;
	    }
	  if (info)
	    *info |= SANE_INFO_RELOAD_OPTIONS;
	  sane_get_parameters (handle, 0);
	  if (info)
	    *info |= SANE_INFO_RELOAD_PARAMS;
	  break;
	case OPT_GRAY_GAIN:
	case OPT_GREEN_GAIN:
	case OPT_RED_GAIN:
	case OPT_BLUE_GAIN:
	  lexmark_device->val[option].w = *(SANE_Word *) value;
	  return SANE_STATUS_GOOD;
	  break;
	case OPT_MODE:
	  strcpy (lexmark_device->val[option].s, value);
	  calc_parameters (lexmark_device);
	  if (info)
	    *info |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS;
	  return SANE_STATUS_GOOD;
	case OPT_MANUAL_GAIN:
	  w = *(SANE_Word *) value;

	  if (w == lexmark_device->val[OPT_MANUAL_GAIN].w)
	    return SANE_STATUS_GOOD;	/* no change */

	  lexmark_device->val[OPT_MANUAL_GAIN].w = w;
	  calc_parameters (lexmark_device);
	  if (info)
	    *info |= SANE_INFO_RELOAD_OPTIONS;
	  return SANE_STATUS_GOOD;
	}

      if (info != NULL)
	*info |= SANE_INFO_RELOAD_PARAMS;

      break;

    case SANE_ACTION_GET_VALUE:

      switch (option)
	{
	case OPT_NUM_OPTS:
	case OPT_RESOLUTION:
	case OPT_PREVIEW:
	case OPT_MANUAL_GAIN:
	case OPT_GRAY_GAIN:
	case OPT_GREEN_GAIN:
	case OPT_RED_GAIN:
	case OPT_BLUE_GAIN:
	case OPT_TL_X:
	case OPT_TL_Y:
	case OPT_BR_X:
	case OPT_BR_Y:
	  *(SANE_Word *) value = lexmark_device->val[option].w;
	  DBG (2, "Option value = %d (%s)\n", *(SANE_Word *) value,
	       lexmark_device->opt[option].name);
	  break;
	case OPT_THRESHOLD:
	  *(SANE_Fixed *) value = lexmark_device->val[option].w;
	  DBG (2, "Option value = %f\n", SANE_UNFIX (*(SANE_Fixed *) value));
	  break;
	case OPT_MODE:
	  strcpy (value, lexmark_device->val[option].s);
	  break;
	default:
	  return SANE_STATUS_INVAL;
	}
      break;

    default:
      return SANE_STATUS_INVAL;

    }

  return SANE_STATUS_GOOD;
}


SANE_Status
sane_get_parameters (SANE_Handle handle, SANE_Parameters * params)
{
  Lexmark_Device *lexmark_device;
  SANE_Parameters *device_params;
  SANE_Int xres, yres, width_px, height_px;
  SANE_Int channels, bitsperchannel;

  DBG (2, "sane_get_parameters: handle=%p, params=%p\n", (void *) handle,
       (void *) params);

  if (!initialized)
    return SANE_STATUS_INVAL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (!lexmark_device)
    return SANE_STATUS_INVAL;

  yres = lexmark_device->val[OPT_RESOLUTION].w;
  if (yres == 1200)
    xres = 600;
  else
    xres = yres;

  /* 24 bit colour = 8 bits/channel for each of the RGB channels */
  channels = 3;
  bitsperchannel = 8;

  /* If not color there is only 1 channel */
  if (strcmp (lexmark_device->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_COLOR)
      != 0)
    {
      channels = 1;
      bitsperchannel = 8;
    }

  /* geometry in pixels */
  width_px =
    lexmark_device->val[OPT_BR_X].w - lexmark_device->val[OPT_TL_X].w;
  height_px =
    lexmark_device->val[OPT_BR_Y].w - lexmark_device->val[OPT_TL_Y].w;
  DBG (7, "sane_get_parameters: tl=(%d,%d) br=(%d,%d)\n",
       lexmark_device->val[OPT_TL_X].w, lexmark_device->val[OPT_TL_Y].w,
       lexmark_device->val[OPT_BR_X].w, lexmark_device->val[OPT_BR_Y].w);


  /* we must tell the front end the bitsperchannel for lineart is really */
  /* only 1, so it can calculate the correct image size */
  /* If not color there is only 1 channel */
  if (strcmp (lexmark_device->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_LINEART)
      == 0)
    {
      bitsperchannel = 1;
    }

  device_params = &(lexmark_device->params);
  device_params->format = SANE_FRAME_RGB;
  if (channels == 1)
    device_params->format = SANE_FRAME_GRAY;
  device_params->last_frame = SANE_TRUE;
  device_params->lines = (height_px * yres) / 600;
  device_params->depth = bitsperchannel;
  device_params->pixels_per_line = (width_px * xres) / 600;
  /* we always read an even number of sensor pixels */
  if (device_params->pixels_per_line & 1)
    device_params->pixels_per_line++;

  /* data_size is the size transferred from the scanner to the backend */
  /* therefore bitsperchannel is the same for gray and lineart */
  /* note: bytes_per_line has been divided by 8 in lineart mode */
  lexmark_device->data_size =
    channels * device_params->pixels_per_line * device_params->lines;

  if (bitsperchannel == 1)
    {
      device_params->bytes_per_line =
	(SANE_Int) ((7 + device_params->pixels_per_line) / 8);
    }
  else
    {
      device_params->bytes_per_line =
	(SANE_Int) (channels * device_params->pixels_per_line);
    }
  DBG (2, "sane_get_parameters: Data size determined as %ld\n",
       lexmark_device->data_size);

  DBG (2, "sane_get_parameters: \n");
  if (device_params->format == SANE_FRAME_GRAY)
    DBG (2, "  format: SANE_FRAME_GRAY\n");
  else if (device_params->format == SANE_FRAME_RGB)
    DBG (2, "  format: SANE_FRAME_RGB\n");
  else
    DBG (2, "  format: UNKNOWN\n");
  if (device_params->last_frame == SANE_TRUE)
    DBG (2, "  last_frame: TRUE\n");
  else
    DBG (2, "  last_frame: FALSE\n");
  DBG (2, "  lines %d\n", device_params->lines);
  DBG (2, "  depth %d\n", device_params->depth);
  DBG (2, "  pixels_per_line %d\n", device_params->pixels_per_line);
  DBG (2, "  bytes_per_line %d\n", device_params->bytes_per_line);

  if (params != 0)
    {
      params->format = device_params->format;
      params->last_frame = device_params->last_frame;
      params->lines = device_params->lines;
      params->depth = device_params->depth;
      params->pixels_per_line = device_params->pixels_per_line;
      params->bytes_per_line = device_params->bytes_per_line;
    }

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_start (SANE_Handle handle)
{
  Lexmark_Device *lexmark_device;
  SANE_Int offset;
  SANE_Status status;
  int resolution;

  DBG (2, "sane_start: handle=%p\n", (void *) handle);

  if (!initialized)
    return SANE_STATUS_INVAL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  sane_get_parameters (handle, 0);

  if ((lexmark_device->params.lines == 0) ||
      (lexmark_device->params.pixels_per_line == 0) ||
      (lexmark_device->params.bytes_per_line == 0))
    {
      DBG (2, "sane_start: \n");
      DBG (2, "  ERROR: Zero size encountered in:\n");
      DBG (2,
	   "         number of lines, bytes per line, or pixels per line\n");
      return SANE_STATUS_INVAL;
    }

  lexmark_device->device_cancelled = SANE_FALSE;
  lexmark_device->data_ctr = 0;
  lexmark_device->eof = SANE_FALSE;


  /* Need this cancel_ctr to determine how many times sane_cancel is called
     since it is called more than once. */
  lexmark_device->cancel_ctr = 0;

  /* Find Home */
  if (sanei_lexmark_low_search_home_fwd (lexmark_device))
    {
      DBG (2, "sane_start: Scan head initially at home position\n");
    }
  else
    {
      /* We may have been rewound too far, so move forward the distance from
         the edge to the home position */
      sanei_lexmark_low_move_fwd (0x01a8, lexmark_device,
				  lexmark_device->shadow_regs);

      /* Scan backwards until we find home */
      sanei_lexmark_low_search_home_bwd (lexmark_device);
    }
  /* do calibration before offset detection , use sensor max dpi, not motor's one */
  resolution = lexmark_device->val[OPT_RESOLUTION].w;
  if (resolution > 600)
    {
      resolution = 600;
    }


  sanei_lexmark_low_set_scan_regs (lexmark_device, resolution, 0, SANE_FALSE);
  status = sanei_lexmark_low_calibration (lexmark_device);
  if (status != SANE_STATUS_GOOD)
    {
      DBG (1, "sane_start: calibration failed : %s ! \n",
	   sane_strstatus (status));
      return status;
    }

  /* At this point we're somewhere in the dot. We need to read a number of
     lines greater than the diameter of the dot and determine how many lines
     past the dot we've gone. We then use this information to see how far the
     scan head must move before starting the scan. */
  /* offset is in 600 dpi unit */
  offset = sanei_lexmark_low_find_start_line (lexmark_device);
  DBG (7, "start line offset=%d\n", offset);

  /* Set the shadow registers for scan with the options (resolution, mode,
     size) set in the front end. Pass the offset so we can get the vert.
     start. */
  sanei_lexmark_low_set_scan_regs (lexmark_device,
				   lexmark_device->val[OPT_RESOLUTION].w,
				   offset, SANE_TRUE);

  if (sanei_lexmark_low_start_scan (lexmark_device) == SANE_STATUS_GOOD)
    {
      DBG (2, "sane_start: scan started\n");
      return SANE_STATUS_GOOD;
    }
  else
    {
      lexmark_device->device_cancelled = SANE_TRUE;
      return SANE_STATUS_INVAL;
    }
}


SANE_Status
sane_read (SANE_Handle handle, SANE_Byte * data,
	   SANE_Int max_length, SANE_Int * length)
{
  Lexmark_Device *lexmark_device;
  long bytes_read;

  DBG (2, "sane_read: handle=%p, data=%p, max_length = %d, length=%p\n",
       (void *) handle, (void *) data, max_length, (void *) length);

  if (!initialized)
    {
      DBG (2, "sane_read: Not initialized\n");
      return SANE_STATUS_INVAL;
    }

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (lexmark_device->device_cancelled)
    {
      DBG (2, "sane_read: Device was cancelled\n");
      /* We don't know how far we've gone, so search for home. */
      sanei_lexmark_low_search_home_bwd (lexmark_device);
      return SANE_STATUS_EOF;
    }

  if (!length)
    {
      DBG (2, "sane_read: NULL length pointer\n");
      return SANE_STATUS_INVAL;
    }

  *length = 0;

  if (lexmark_device->eof)
    {
      DBG (2, "sane_read: Trying to read past EOF\n");
      return SANE_STATUS_EOF;
    }

  if (!data)
    return SANE_STATUS_INVAL;

  bytes_read = sanei_lexmark_low_read_scan_data (data, max_length,
						 lexmark_device);
  if (bytes_read < 0)
    return SANE_STATUS_IO_ERROR;
  else if (bytes_read == 0)
    return SANE_STATUS_EOF;
  else
    {
      *length = bytes_read;
      lexmark_device->data_ctr += bytes_read;
    }

  return SANE_STATUS_GOOD;
}

void
sane_cancel (SANE_Handle handle)
{
  Lexmark_Device *lexmark_device;
/*   ssize_t bytes_read; */
  DBG (2, "sane_cancel: handle = %p\n", (void *) handle);

  if (!initialized)
    return;


  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  /*If sane_cancel called more than once, return */
  if (++lexmark_device->cancel_ctr > 1)
    return;

  /* Set the device flag so the next call to sane_read() can stop the scan. */
  lexmark_device->device_cancelled = SANE_TRUE;

  return;
}

SANE_Status
sane_set_io_mode (SANE_Handle handle, SANE_Bool non_blocking)
{
  Lexmark_Device *lexmark_device;

  DBG (2, "sane_set_io_mode: handle = %p, non_blocking = %d\n",
       (void *) handle, non_blocking);

  if (!initialized)
    return SANE_STATUS_INVAL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  if (non_blocking)
    return SANE_STATUS_UNSUPPORTED;

  return SANE_STATUS_GOOD;
}

SANE_Status
sane_get_select_fd (SANE_Handle handle, SANE_Int * fd)
{
  Lexmark_Device *lexmark_device;

  DBG (2, "sane_get_select_fd: handle = %p, fd %s 0\n", (void *) handle,
       fd ? "!=" : "=");

  if (!initialized)
    return SANE_STATUS_INVAL;

  for (lexmark_device = first_lexmark_device; lexmark_device;
       lexmark_device = lexmark_device->next)
    {
      if (lexmark_device == handle)
	break;
    }

  return SANE_STATUS_UNSUPPORTED;
}

/***************************** END OF SANE API ****************************/
/* vim: set sw=2 cino=>2se-1sn-1s{s^-1st0(0u0 smarttab expandtab: */